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splitting dhcp scopewe currently have a cluster which is servicing dhcp and wins.
Is it possible to have 2 servers that I can split up the dhcp scope and still have redundancy if one server fails without using clustering? "Joey" <j***@joey.com> wrote in message news:%23RLwAXB2JHA.4416@TK2MSFTNGP05.phx.gbl... Yes, usually the 80/20 rule would apply. This would be a backup strategy if one of them were to go down. You can also opt for a 50/50 strategy, too for load balancing, but they cannot be combined between two different DHCP servers.> we currently have a cluster which is servicing dhcp and wins. > > Is it possible to have 2 servers that I can split up the dhcp scope and > still have redundancy if one server fails without using clustering? > > 80/20 RuleFor balancing DHCP server usage, use the 80/20 rule to divide scope addresses between DHCP servers. Figure 4.11 is an example of the 80/20 rule. ... http://technet.microsoft.com/en-us/library/cc958936.aspx Configuring scopes: Dynamic Host Configuration Protocol (DHCP)Jan 21, 2005 ... For balancing DHCP server usage, a good practice is to use the "80/20" rule to divide the scope addresses between the two DHCP servers. .... http://technet.microsoft.com/en-us/library/cc739076(WS.10).aspx -- Ace This posting is provided "AS-IS" with no warranties or guarantees and confers no rights. Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSA Messaging, MCT Microsoft Certified Trainer ace***@mvps.RemoveThisPart.org For urgent issues, you may want to contact Microsoft PSS directly. Please check http://support.microsoft.com for regional support phone numbers. "Efficiency is doing things right; effectiveness is doing the right things." - Peter F. Drucker http://twitter.com/acefekay If I go with 80/20 rule. what happens if one for the dhcp server fails or go
offline? what do I do with clients that cannot get IP address on the server that does not have a scope configured "Ace Fekay [Microsoft Certified Trainer]" <ace***@mvps.RemoveThisPart.org> Yes, usually the 80/20 rule would apply. This would be a backup strategy if wrote in message news:%23ztHfeB2JHA.6056@TK2MSFTNGP03.phx.gbl... "Joey" <j***@joey.com> wrote in message news:%23RLwAXB2JHA.4416@TK2MSFTNGP05.phx.gbl... > we currently have a cluster which is servicing dhcp and wins. > > Is it possible to have 2 servers that I can split up the dhcp scope and > still have redundancy if one server fails without using clustering? > > one of them were to go down. You can also opt for a 50/50 strategy, too for load balancing, but they cannot be combined between two different DHCP servers. 80/20 RuleFor balancing DHCP server usage, use the 80/20 rule to divide scope addresses between DHCP servers. Figure 4.11 is an example of the 80/20 rule. ... http://technet.microsoft.com/en-us/library/cc958936.aspx Configuring scopes: Dynamic Host Configuration Protocol (DHCP)Jan 21, 2005 .... For balancing DHCP server usage, a good practice is to use the "80/20" rule to divide the scope addresses between the two DHCP servers. ... http://technet.microsoft.com/en-us/library/cc739076(WS.10).aspx -- Ace This posting is provided "AS-IS" with no warranties or guarantees and confers no rights. Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSA Messaging, MCT Microsoft Certified Trainer ace***@mvps.RemoveThisPart.org For urgent issues, you may want to contact Microsoft PSS directly. Please check http://support.microsoft.com for regional support phone numbers. "Efficiency is doing things right; effectiveness is doing the right things." - Peter F. Drucker http://twitter.com/acefekay "Joey" <j***@joey.com> wrote in message news:%23xl6StB2JHA.4416@TK2MSFTNGP05.phx.gbl... The 80/20 rule means both servers have a scope configured, so I'm not sure what you mean? Check out the articles. The main server will have 80% of the scope, the other having 20%. If the main one goes down, the other will keep giving out addresses until you get the first one up. > If I go with 80/20 rule. what happens if one for the dhcp server fails or go > offline? what do I do with clients that cannot get IP address on the server > that does not have a scope configured Or did you mean something else? Ace Why in the world did they ever dream up the 80/20 idea when the 50/50 is so
much more logical? -- Phillip Windell The views expressed, are my own and not those of my employer, or Microsoft, or anyone else associated with me, including my cats. ----------------------------------------------------- "Ace Fekay [Microsoft Certified Trainer]" <ace***@mvps.RemoveThisPart.org> The 80/20 rule means both servers have a scope configured, so I'm not sure wrote in message news:OdM3UcC2JHA.1716@TK2MSFTNGP03.phx.gbl... "Joey" <j***@joey.com> wrote in message news:%23xl6StB2JHA.4416@TK2MSFTNGP05.phx.gbl... > If I go with 80/20 rule. what happens if one for the dhcp server fails or > go > offline? what do I do with clients that cannot get IP address on the > server > that does not have a scope configured what you mean? Check out the articles. The main server will have 80% of the scope, the other having 20%. If the main one goes down, the other will keep giving out addresses until you get the first one up. Or did you mean something else? Ace Just add both ip's of the DHCP servers, to your helper address on the router
per subnet Show quoteHide quote "Phillip Windell" <philwind***@hotmail.com> wrote in message news:e9uZ2VI2JHA.5728@TK2MSFTNGP03.phx.gbl... > Why in the world did they ever dream up the 80/20 idea when the 50/50 is > so much more logical? > > > -- > Phillip Windell > > The views expressed, are my own and not those of my employer, or > Microsoft, > or anyone else associated with me, including my cats. > ----------------------------------------------------- > > > "Ace Fekay [Microsoft Certified Trainer]" <ace***@mvps.RemoveThisPart.org> > wrote in message news:OdM3UcC2JHA.1716@TK2MSFTNGP03.phx.gbl... > "Joey" <j***@joey.com> wrote in message > news:%23xl6StB2JHA.4416@TK2MSFTNGP05.phx.gbl... >> If I go with 80/20 rule. what happens if one for the dhcp server fails or >> go >> offline? what do I do with clients that cannot get IP address on the >> server >> that does not have a scope configured > > > The 80/20 rule means both servers have a scope configured, so I'm not sure > what you mean? Check out the articles. The main server will have 80% of > the scope, the other having 20%. If the main one goes down, the other will > keep giving out addresses until you get the first one up. > > Or did you mean something else? > > Ace > my thought you cannot have 2 dhcp servers on the same network. If I do have
2 dhcp servers, any client on the network will get an ip from the first dhcp that responds? I still dont understand what 80/20 mean. from the diagram. I see the same scope configured on both servers but on different subnets. for our network, we only have one dhcp cluster servicing multiple vlans. I believe the router is doing some dhcp helper thing to help clients from different subnets find the dhcp cluster. "Ace Fekay [Microsoft Certified Trainer]" <ace***@mvps.RemoveThisPart.org> The 80/20 rule means both servers have a scope configured, so I'm not sure wrote in message news:OdM3UcC2JHA.1716@TK2MSFTNGP03.phx.gbl... "Joey" <j***@joey.com> wrote in message news:%23xl6StB2JHA.4416@TK2MSFTNGP05.phx.gbl... > If I go with 80/20 rule. what happens if one for the dhcp server fails or > go > offline? what do I do with clients that cannot get IP address on the > server > that does not have a scope configured what you mean? Check out the articles. The main server will have 80% of the scope, the other having 20%. If the main one goes down, the other will keep giving out addresses until you get the first one up. Or did you mean something else? Ace "Joey" <j***@joey.com> wrote in message Yes you cannews:%23LwaRTK2JHA.3304@TK2MSFTNGP06.phx.gbl... > my thought you cannot have 2 dhcp servers on the same network. If I do > have > 2 dhcp servers, any client on the network will get an ip from the first Yes that is correct.> dhcp that responds? > I still dont understand what 80/20 mean. from the diagram. I see the same It is the same identical Scope except that Exclusions are use on each that > scope configured on both servers but on different subnets. limit what IP#s it can actually give out to Clients. I never do 80/20,..it doesn't make good sense to me,..I always do 50/50. One DHCP gives out the first half of the available addresses,...the second DHSP gives out the second half of the addresses (hence 50/50). -- Phillip Windell The views expressed, are my own and not those of my employer, or Microsoft, or anyone else associated with me, including my cats. ----------------------------------------------------- That's exactly how we do it too. We just make sure that each server has
a large enough scope to handle the entire network if it has to. -- Show quoteHide quote-Ben- Ben M. Schorr, MVP Roland Schorr & Tower http://www.rolandschorr.com http://www.officeforlawyers.com Author - The Lawyer's Guide to Microsoft Outlook 2007: http://tinyurl.com/5m3f5q "Phillip Windell" <philwind***@hotmail.com> wrote in message news:OVMxvvK2JHA.3476@TK2MSFTNGP05.phx.gbl: > It is the same identical Scope except that Exclusions are use on each that > limit what IP#s it can actually give out to Clients. I never do 80/20,..it > doesn't make good sense to me,..I always do 50/50. One DHCP gives out the > first half of the available addresses,...the second DHSP gives out the > second half of the addresses (hence 50/50). > > -- > Phillip Windell > > The views expressed, are my own and not those of my employer, or Microsoft, > or anyone else associated with me, including my cats. > ----------------------------------------------------- Hi Ben, good to hear from you!
Ours doesn't quite have enough with only 50%,..but it would survive longer, giving me more time to fix the dead one than what I would have if I ran 80/20 and it was the 80% one that died. -- Show quoteHide quotePhillip Windell The views expressed, are my own and not those of my employer, or Microsoft, or anyone else associated with me, including my cats. ----------------------------------------------------- "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message news:eR7HtyL2JHA.5772@TK2MSFTNGP02.phx.gbl... > That's exactly how we do it too. We just make sure that each server has a > large enough scope to handle the entire network if it has to. > > -- > -Ben- > Ben M. Schorr, MVP > Roland Schorr & Tower > http://www.rolandschorr.com > http://www.officeforlawyers.com > Author - The Lawyer's Guide to Microsoft Outlook 2007: > http://tinyurl.com/5m3f5q > > > > "Phillip Windell" <philwind***@hotmail.com> wrote in message > news:OVMxvvK2JHA.3476@TK2MSFTNGP05.phx.gbl: > >> It is the same identical Scope except that Exclusions are use on each >> that >> limit what IP#s it can actually give out to Clients. I never do >> 80/20,..it >> doesn't make good sense to me,..I always do 50/50. One DHCP gives out >> the >> first half of the available addresses,...the second DHSP gives out the >> second half of the addresses (hence 50/50). >> >> -- >> Phillip Windell >> >> The views expressed, are my own and not those of my employer, or >> Microsoft, >> or anyone else associated with me, including my cats. >> ----------------------------------------------------- > "Joey" <j***@joey.com> wrote in message news:%23LwaRTK2JHA.3304@TK2MSFTNGP06.phx.gbl... The 80/20, or preferrably as Phillip mentioned, 50/50 idea has been around for quite some time. You can have two DHCP servers but as long as the IP ranges do not cross, you are good to go.> my thought you cannot have 2 dhcp servers on the same network. If I do have > 2 dhcp servers, any client on the network will get an ip from the first dhcp > that responds? I still dont understand what 80/20 mean. from the diagram. I > see the same scope configured on both servers but on different subnets. > > for our network, we only have one dhcp cluster servicing multiple vlans. I > believe the router is doing some dhcp helper thing to help clients from > different subnets find the dhcp cluster. Ace Once had a guy from MS tell me that they used to recommend 80/20 in the
past,..but now recommend 50/50 and so it just depends on how old the material is you are reading. I don't know how accurate that is. It's hard for one tech guy at MS to speak for the whole company. -- Show quoteHide quotePhillip Windell The views expressed, are my own and not those of my employer, or Microsoft, or anyone else associated with me, including my cats. ----------------------------------------------------- "Ace Fekay [Microsoft Certified Trainer]" <ace***@mvps.RemoveThisPart.org> The 80/20, or preferrably as Phillip mentioned, 50/50 idea has been around wrote in message news:%239d40kL2JHA.1644@TK2MSFTNGP02.phx.gbl... "Joey" <j***@joey.com> wrote in message news:%23LwaRTK2JHA.3304@TK2MSFTNGP06.phx.gbl... > my thought you cannot have 2 dhcp servers on the same network. If I do > have > 2 dhcp servers, any client on the network will get an ip from the first > dhcp > that responds? I still dont understand what 80/20 mean. from the diagram. > I > see the same scope configured on both servers but on different subnets. > > for our network, we only have one dhcp cluster servicing multiple vlans. I > believe the router is doing some dhcp helper thing to help clients from > different subnets find the dhcp cluster. for quite some time. You can have two DHCP servers but as long as the IP ranges do not cross, you are good to go. Ace "Phillip Windell" <philwind***@hotmail.com> wrote in message news:u2ECgMM2JHA.6056@TK2MSFTNGP03.phx.gbl... True. Just like originally the empty forest root domain and child domains was an original design recommendation, but that has changed. Originally the domain was a security boundary, but now many look at the forest as a security boundary based on the common Schema, EA, etc. I think another was originally to name the domain the same as the public namespace, but that has changed, too! It's all based on everyone's experience and feedback over the years. I like the 50/50 rule better. > Once had a guy from MS tell me that they used to recommend 80/20 in the > past,..but now recommend 50/50 and so it just depends on how old the > material is you are reading. I don't know how accurate that is. It's hard > for one tech guy at MS to speak for the whole company. > > :-) AceFrom the diagram the scopes are crossed. what do you mean by do not cross?
Say I have a few scopes on one dhcp server 10.10.10.0 - 10.10.11.254 10.10.12.0- 10.10.13.254 how do I split these up into 2 dhcp servers? Show quoteHide quote "Ace Fekay [Microsoft Certified Trainer]" <ace***@mvps.RemoveThisPart.org> The 80/20, or preferrably as Phillip mentioned, 50/50 idea has been around wrote in message news:%239d40kL2JHA.1644@TK2MSFTNGP02.phx.gbl... "Joey" <j***@joey.com> wrote in message news:%23LwaRTK2JHA.3304@TK2MSFTNGP06.phx.gbl... > my thought you cannot have 2 dhcp servers on the same network. If I do > have > 2 dhcp servers, any client on the network will get an ip from the first > dhcp > that responds? I still dont understand what 80/20 mean. from the diagram. > I > see the same scope configured on both servers but on different subnets. > > for our network, we only have one dhcp cluster servicing multiple vlans. I > believe the router is doing some dhcp helper thing to help clients from > different subnets find the dhcp cluster. for quite some time. You can have two DHCP servers but as long as the IP ranges do not cross, you are good to go. Ace "Joey" <j***@joey.com> wrote in message news:eJaSDdN2JHA.5728@TK2MSFTNGP03.phx.gbl... Maybe overlap should have been the better word than 'crossed.'> From the diagram the scopes are crossed. what do you mean by do not cross? > > Say I have a few scopes on one dhcp server > > 10.10.10.0 - 10.10.11.254 > 10.10.12.0- 10.10.13.254 > > how do I split these up into 2 dhcp servers? For 50/50: Server1: 10.10.10.1 - 10.10.10.254 10.10.12.1 - 10.10.12.254 Server2: 10.10.11.1 - 10.10.11.254 10.10.13.1 - 10.10.13.254 Ace If I do it this way and server 1 fails. what happens if server2 doesnt have
any available lease addresses on either one of the ranges? "Ace Fekay [Microsoft Certified Trainer]" <ace***@mvps.RemoveThisPart.org> Maybe overlap should have been the better word than 'crossed.'wrote in message news:u52XtIO2JHA.5772@TK2MSFTNGP02.phx.gbl... "Joey" <j***@joey.com> wrote in message news:eJaSDdN2JHA.5728@TK2MSFTNGP03.phx.gbl... > From the diagram the scopes are crossed. what do you mean by do not cross? > > Say I have a few scopes on one dhcp server > > 10.10.10.0 - 10.10.11.254 > 10.10.12.0- 10.10.13.254 > > how do I split these up into 2 dhcp servers? For 50/50: Server1: 10.10.10.1 - 10.10.10.254 10.10.12.1 - 10.10.12.254 Server2: 10.10.11.1 - 10.10.11.254 10.10.13.1 - 10.10.13.254 Ace If you have THAT many clients then you need to select larger ranges.
-- Show quoteHide quote-Ben- Ben M. Schorr, MVP Roland Schorr & Tower http://www.rolandschorr.com http://www.officeforlawyers.com Author - The Lawyer's Guide to Microsoft Outlook 2007: http://tinyurl.com/5m3f5q "Joey" <j***@joey.com> wrote in message news:ehV0$bO2JHA.4744@TK2MSFTNGP04.phx.gbl: > If I do it this way and server 1 fails. what happens if server2 doesnt have > any available lease addresses on either one of the ranges? > "Ace Fekay [Microsoft Certified Trainer]" <ace***@mvps.RemoveThisPart.org> > wrote in message news:u52XtIO2JHA.5772@TK2MSFTNGP02.phx.gbl... > "Joey" <j***@joey.com> wrote in message > news:eJaSDdN2JHA.5728@TK2MSFTNGP03.phx.gbl... > > > From the diagram the scopes are crossed. what do you mean by do not cross? > > > > Say I have a few scopes on one dhcp server > > > > 10.10.10.0 - 10.10.11.254 > > 10.10.12.0- 10.10.13.254 > > > > how do I split these up into 2 dhcp servers? > > > Maybe overlap should have been the better word than 'crossed.' > > For 50/50: > > Server1: > 10.10.10.1 - 10.10.10.254 > 10.10.12.1 - 10.10.12.254 > > Server2: > 10.10.11.1 - 10.10.11.254 > 10.10.13.1 - 10.10.13.254 > > Ace Indeed. Each DHCP server must be capable of handling the complete load
alone. With the 50/50 system, half of the available IP addresses are reserved on each DHCP server. If one server fails, removing the reservation allows all machines to use the one remaining server. Show quoteHide quote "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message news:exqxvPP2JHA.140@TK2MSFTNGP03.phx.gbl... > If you have THAT many clients then you need to select larger ranges. > > -- > -Ben- > Ben M. Schorr, MVP > Roland Schorr & Tower > http://www.rolandschorr.com > http://www.officeforlawyers.com > Author - The Lawyer's Guide to Microsoft Outlook 2007: > http://tinyurl.com/5m3f5q > > > > "Joey" <j***@joey.com> wrote in message > news:ehV0$bO2JHA.4744@TK2MSFTNGP04.phx.gbl: > >> If I do it this way and server 1 fails. what happens if server2 doesnt >> have >> any available lease addresses on either one of the ranges? >> "Ace Fekay [Microsoft Certified Trainer]" >> <ace***@mvps.RemoveThisPart.org> >> wrote in message news:u52XtIO2JHA.5772@TK2MSFTNGP02.phx.gbl... >> "Joey" <j***@joey.com> wrote in message >> news:eJaSDdN2JHA.5728@TK2MSFTNGP03.phx.gbl... >> >> > From the diagram the scopes are crossed. what do you mean by do not >> > cross? >> > >> > Say I have a few scopes on one dhcp server >> > >> > 10.10.10.0 - 10.10.11.254 >> > 10.10.12.0- 10.10.13.254 >> > >> > how do I split these up into 2 dhcp servers? >> >> >> Maybe overlap should have been the better word than 'crossed.' >> >> For 50/50: >> >> Server1: >> 10.10.10.1 - 10.10.10.254 >> 10.10.12.1 - 10.10.12.254 >> >> Server2: >> 10.10.11.1 - 10.10.11.254 >> 10.10.13.1 - 10.10.13.254 >> >> Ace > I don't think there's any need to reserve the IP addresses. Just use
distinct scopes on each server that are all in the same subnet. We have a client that uses a Class B scheme. They use 172.23.x.x. Their servers are 172.23.1.x Their workstations from one DHCP server are 172.23.2.x Their workstations from the other DHCP server are 172.23.22.x Remote workstations get 172.23.222.x They have network devices (like printers, etc.) on 172.23.3.x Either DHCP server can carry their entire network by itself, and there's no overlap. If either server goes down the other carries the network. And it's easy to tell which server a workstation got its address from (.2 or .22). It's simple, elegant, reliable and effective. -- Show quoteHide quote-Ben- Ben M. Schorr, MVP Roland Schorr & Tower http://www.rolandschorr.com http://www.officeforlawyers.com Author - The Lawyer's Guide to Microsoft Outlook 2007: http://tinyurl.com/5m3f5q "Bill Grant" <not.available@online> wrote in message news:#bdQqtQ2JHA.480@TK2MSFTNGP06.phx.gbl: > Indeed. Each DHCP server must be capable of handling the complete load > alone. > > With the 50/50 system, half of the available IP addresses are reserved on > each DHCP server. If one server fails, removing the reservation allows all > machines to use the one remaining server. > > "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message > news:exqxvPP2JHA.140@TK2MSFTNGP03.phx.gbl... > > > If you have THAT many clients then you need to select larger ranges. > > > > -- > > -Ben- > > Ben M. Schorr, MVP > > Roland Schorr & Tower > > http://www.rolandschorr.com > > http://www.officeforlawyers.com > > Author - The Lawyer's Guide to Microsoft Outlook 2007: > > http://tinyurl.com/5m3f5q > > > > > > > > "Joey" <j***@joey.com> wrote in message > > news:ehV0$bO2JHA.4744@TK2MSFTNGP04.phx.gbl: > > > > >> If I do it this way and server 1 fails. what happens if server2 doesnt > >> have > >> any available lease addresses on either one of the ranges? > >> "Ace Fekay [Microsoft Certified Trainer]" > >> <ace***@mvps.RemoveThisPart.org> > >> wrote in message news:u52XtIO2JHA.5772@TK2MSFTNGP02.phx.gbl... > >> "Joey" <j***@joey.com> wrote in message > >> news:eJaSDdN2JHA.5728@TK2MSFTNGP03.phx.gbl... > >> > > >> > From the diagram the scopes are crossed. what do you mean by do not > >> > cross? > >> > > >> > Say I have a few scopes on one dhcp server > >> > > >> > 10.10.10.0 - 10.10.11.254 > >> > 10.10.12.0- 10.10.13.254 > >> > > >> > how do I split these up into 2 dhcp servers? > >> > >> > > >> Maybe overlap should have been the better word than 'crossed.' > >> > >> For 50/50: > >> > >> Server1: > >> 10.10.10.1 - 10.10.10.254 > >> 10.10.12.1 - 10.10.12.254 > >> > >> Server2: > >> 10.10.11.1 - 10.10.11.254 > >> 10.10.13.1 - 10.10.13.254 > >> > >> Ace > > > I have like 10 vlans
it all goes like this 10.10.1.0 - 10.10.2.254 scope 10.10.1.50 - 10.10.2.254 10.10.3.0 - 10.10.4.254 scope 10.10.3.50 - 10.10.4.254 10.10.5.0 - 10.10.6.254 scope 10.10.5.50 - 10.10.6.254 and so on how do I break this up into 2 dhcp servers? These 2 dhcp servers should be on the same broadcast domain right (vlan)? Show quoteHide quote "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message news:OwTxV6R2JHA.3304@TK2MSFTNGP06.phx.gbl... >I don't think there's any need to reserve the IP addresses. Just use >distinct scopes on each server that are all in the same subnet. > > We have a client that uses a Class B scheme. They use 172.23.x.x. > > Their servers are 172.23.1.x > Their workstations from one DHCP server are 172.23.2.x > Their workstations from the other DHCP server are 172.23.22.x > Remote workstations get 172.23.222.x > They have network devices (like printers, etc.) on 172.23.3.x > > Either DHCP server can carry their entire network by itself, and there's > no overlap. If either server goes down the other carries the network. > And it's easy to tell which server a workstation got its address from (.2 > or .22). > > It's simple, elegant, reliable and effective. > > -- > -Ben- > Ben M. Schorr, MVP > Roland Schorr & Tower > http://www.rolandschorr.com > http://www.officeforlawyers.com > Author - The Lawyer's Guide to Microsoft Outlook 2007: > http://tinyurl.com/5m3f5q > > > > "Bill Grant" <not.available@online> wrote in message > news:#bdQqtQ2JHA.480@TK2MSFTNGP06.phx.gbl: > >> Indeed. Each DHCP server must be capable of handling the complete load >> alone. >> >> With the 50/50 system, half of the available IP addresses are reserved >> on >> each DHCP server. If one server fails, removing the reservation allows >> all >> machines to use the one remaining server. >> >> "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message >> news:exqxvPP2JHA.140@TK2MSFTNGP03.phx.gbl... >> >> > If you have THAT many clients then you need to select larger ranges. >> > >> > -- >> > -Ben- >> > Ben M. Schorr, MVP >> > Roland Schorr & Tower >> > http://www.rolandschorr.com >> > http://www.officeforlawyers.com >> > Author - The Lawyer's Guide to Microsoft Outlook 2007: >> > http://tinyurl.com/5m3f5q >> > >> > >> > >> > "Joey" <j***@joey.com> wrote in message >> > news:ehV0$bO2JHA.4744@TK2MSFTNGP04.phx.gbl: >> > >> >> >> If I do it this way and server 1 fails. what happens if server2 doesnt >> >> have >> >> any available lease addresses on either one of the ranges? >> >> "Ace Fekay [Microsoft Certified Trainer]" >> >> <ace***@mvps.RemoveThisPart.org> >> >> wrote in message news:u52XtIO2JHA.5772@TK2MSFTNGP02.phx.gbl... >> >> "Joey" <j***@joey.com> wrote in message >> >> news:eJaSDdN2JHA.5728@TK2MSFTNGP03.phx.gbl... >> >> >> >> >> > From the diagram the scopes are crossed. what do you mean by do not >> >> > cross? >> >> > >> >> > Say I have a few scopes on one dhcp server >> >> > >> >> > 10.10.10.0 - 10.10.11.254 >> >> > 10.10.12.0- 10.10.13.254 >> >> > >> >> > how do I split these up into 2 dhcp servers? >> >> >> >> >> >> >> Maybe overlap should have been the better word than 'crossed.' >> >> >> >> For 50/50: >> >> >> >> Server1: >> >> 10.10.10.1 - 10.10.10.254 >> >> 10.10.12.1 - 10.10.12.254 >> >> >> >> Server2: >> >> 10.10.11.1 - 10.10.11.254 >> >> 10.10.13.1 - 10.10.13.254 >> >> >> >> Ace >> >> > > Joey,
1) Each Scope is one subnet e.g. 10.10.10.0/24. The Address Pool is the part of the subnet you want to use for clients (in your case .50 - .254). Exclusions are any part of the Pool you can't use. 2) Each DHCP server is one one subnet 3) Each DHCP server has all scopes 4) Each DCHP server uses reciprocal exclusions. So one might exclude .50 - ..150 and the other will exclude .151 - .254 This way both servers service every subnet, but can not assign duplicate IP's 5) Each client VLAN must have an IP Forwarder address configured so that DHCP requests are forwarded to the DHCP servers Hope that helps, Anthony, http://www.airdesk.com Show quoteHide quote "Joey" <j***@joey.com> wrote in message news:eidO2DY2JHA.140@TK2MSFTNGP03.phx.gbl... > I have like 10 vlans > > it all goes like this > > 10.10.1.0 - 10.10.2.254 > scope 10.10.1.50 - 10.10.2.254 > > 10.10.3.0 - 10.10.4.254 > scope 10.10.3.50 - 10.10.4.254 > > 10.10.5.0 - 10.10.6.254 > scope 10.10.5.50 - 10.10.6.254 > > and so on > > how do I break this up into 2 dhcp servers? These 2 dhcp servers should be > on the same broadcast domain right (vlan)? > > "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message > news:OwTxV6R2JHA.3304@TK2MSFTNGP06.phx.gbl... >>I don't think there's any need to reserve the IP addresses. Just use >>distinct scopes on each server that are all in the same subnet. >> >> We have a client that uses a Class B scheme. They use 172.23.x.x. >> >> Their servers are 172.23.1.x >> Their workstations from one DHCP server are 172.23.2.x >> Their workstations from the other DHCP server are 172.23.22.x >> Remote workstations get 172.23.222.x >> They have network devices (like printers, etc.) on 172.23.3.x >> >> Either DHCP server can carry their entire network by itself, and there's >> no overlap. If either server goes down the other carries the network. >> And it's easy to tell which server a workstation got its address from (.2 >> or .22). >> >> It's simple, elegant, reliable and effective. >> >> -- >> -Ben- >> Ben M. Schorr, MVP >> Roland Schorr & Tower >> http://www.rolandschorr.com >> http://www.officeforlawyers.com >> Author - The Lawyer's Guide to Microsoft Outlook 2007: >> http://tinyurl.com/5m3f5q >> >> >> >> "Bill Grant" <not.available@online> wrote in message >> news:#bdQqtQ2JHA.480@TK2MSFTNGP06.phx.gbl: >> >>> Indeed. Each DHCP server must be capable of handling the complete load >>> alone. >>> >>> With the 50/50 system, half of the available IP addresses are >>> reserved on >>> each DHCP server. If one server fails, removing the reservation allows >>> all >>> machines to use the one remaining server. >>> >>> "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message >>> news:exqxvPP2JHA.140@TK2MSFTNGP03.phx.gbl... >>> >>> > If you have THAT many clients then you need to select larger ranges. >>> > >>> > -- >>> > -Ben- >>> > Ben M. Schorr, MVP >>> > Roland Schorr & Tower >>> > http://www.rolandschorr.com >>> > http://www.officeforlawyers.com >>> > Author - The Lawyer's Guide to Microsoft Outlook 2007: >>> > http://tinyurl.com/5m3f5q >>> > >>> > >>> > >>> > "Joey" <j***@joey.com> wrote in message >>> > news:ehV0$bO2JHA.4744@TK2MSFTNGP04.phx.gbl: >>> > >>> >>> >> If I do it this way and server 1 fails. what happens if server2 >>> >> doesnt >>> >> have >>> >> any available lease addresses on either one of the ranges? >>> >> "Ace Fekay [Microsoft Certified Trainer]" >>> >> <ace***@mvps.RemoveThisPart.org> >>> >> wrote in message news:u52XtIO2JHA.5772@TK2MSFTNGP02.phx.gbl... >>> >> "Joey" <j***@joey.com> wrote in message >>> >> news:eJaSDdN2JHA.5728@TK2MSFTNGP03.phx.gbl... >>> >> >>> >>> >> > From the diagram the scopes are crossed. what do you mean by do not >>> >> > cross? >>> >> > >>> >> > Say I have a few scopes on one dhcp server >>> >> > >>> >> > 10.10.10.0 - 10.10.11.254 >>> >> > 10.10.12.0- 10.10.13.254 >>> >> > >>> >> > how do I split these up into 2 dhcp servers? >>> >> >>> >> >>> >>> >> Maybe overlap should have been the better word than 'crossed.' >>> >> >>> >> For 50/50: >>> >> >>> >> Server1: >>> >> 10.10.10.1 - 10.10.10.254 >>> >> 10.10.12.1 - 10.10.12.254 >>> >> >>> >> Server2: >>> >> 10.10.11.1 - 10.10.11.254 >>> >> 10.10.13.1 - 10.10.13.254 >>> >> >>> >> Ace >>> >>> > >> > >
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"Joey" <j***@joey.com> wrote in message news:eidO2DY2JHA.140@TK2MSFTNGP03.phx.gbl... THe way I showed you seems to be appropriate. As said, you may need to expand it to a larger subnet for each VLAN to elegantly offer enough IPs so one server can handle it when you have two splitting the scope.>I have like 10 vlans > > it all goes like this > > 10.10.1.0 - 10.10.2.254 > scope 10.10.1.50 - 10.10.2.254 > > 10.10.3.0 - 10.10.4.254 > scope 10.10.3.50 - 10.10.4.254 > > 10.10.5.0 - 10.10.6.254 > scope 10.10.5.50 - 10.10.6.254 > > and so on > > how do I break this up into 2 dhcp servers? These 2 dhcp servers should be > on the same broadcast domain right (vlan)? > As for giving out IPs to the multiple subnets, use IP Helpers on your layer 3 switches using the DHCP relay agent. The idea is to look at recovery time of your server, or how fast you can simply replace it. Do you have a DR plan? Have you explored this area of recovery? I understand you are looking at clustering, NLB, etc, but a DR sounds like is what you need here as well. Ace Out of curiousity, what subnet mask are you using for those?
-- Show quoteHide quote-Ben- Ben M. Schorr, MVP Roland Schorr & Tower http://www.rolandschorr.com http://www.officeforlawyers.com Author - The Lawyer's Guide to Microsoft Outlook 2007: http://tinyurl.com/5m3f5q "Joey" <j***@joey.com> wrote in message news:eidO2DY2JHA.140@TK2MSFTNGP03.phx.gbl: > I have like 10 vlans > > it all goes like this > > 10.10.1.0 - 10.10.2.254 > scope 10.10.1.50 - 10.10.2.254 > > 10.10.3.0 - 10.10.4.254 > scope 10.10.3.50 - 10.10.4.254 > > 10.10.5.0 - 10.10.6.254 > scope 10.10.5.50 - 10.10.6.254 > > and so on > > how do I break this up into 2 dhcp servers? These 2 dhcp servers should be > on the same broadcast domain right (vlan)? > > "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message > news:OwTxV6R2JHA.3304@TK2MSFTNGP06.phx.gbl... > > >I don't think there's any need to reserve the IP addresses. Just use > >distinct scopes on each server that are all in the same subnet. > > > > We have a client that uses a Class B scheme. They use 172.23.x.x. > > > > Their servers are 172.23.1.x > > Their workstations from one DHCP server are 172.23.2.x > > Their workstations from the other DHCP server are 172.23.22.x > > Remote workstations get 172.23.222.x > > They have network devices (like printers, etc.) on 172.23.3.x > > > > Either DHCP server can carry their entire network by itself, and there's > > no overlap. If either server goes down the other carries the network. > > And it's easy to tell which server a workstation got its address from (.2 > > or .22). > > > > It's simple, elegant, reliable and effective. > > > > -- > > -Ben- > > Ben M. Schorr, MVP > > Roland Schorr & Tower > > http://www.rolandschorr.com > > http://www.officeforlawyers.com > > Author - The Lawyer's Guide to Microsoft Outlook 2007: > > http://tinyurl.com/5m3f5q > > > > > > > > "Bill Grant" <not.available@online> wrote in message > > news:#bdQqtQ2JHA.480@TK2MSFTNGP06.phx.gbl: > > > > >> Indeed. Each DHCP server must be capable of handling the complete load > >> alone. > >> > >> With the 50/50 system, half of the available IP addresses are reserved > >> on > >> each DHCP server. If one server fails, removing the reservation allows > >> all > >> machines to use the one remaining server. > >> > >> "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message > >> news:exqxvPP2JHA.140@TK2MSFTNGP03.phx.gbl... > >> > > >> > If you have THAT many clients then you need to select larger ranges. > >> > > >> > -- > >> > -Ben- > >> > Ben M. Schorr, MVP > >> > Roland Schorr & Tower > >> > http://www.rolandschorr.com > >> > http://www.officeforlawyers.com > >> > Author - The Lawyer's Guide to Microsoft Outlook 2007: > >> > http://tinyurl.com/5m3f5q > >> > > >> > > >> > > >> > "Joey" <j***@joey.com> wrote in message > >> > news:ehV0$bO2JHA.4744@TK2MSFTNGP04.phx.gbl: > >> > > >> > > >> >> If I do it this way and server 1 fails. what happens if server2 doesnt > >> >> have > >> >> any available lease addresses on either one of the ranges? > >> >> "Ace Fekay [Microsoft Certified Trainer]" > >> >> <ace***@mvps.RemoveThisPart.org> > >> >> wrote in message news:u52XtIO2JHA.5772@TK2MSFTNGP02.phx.gbl... > >> >> "Joey" <j***@joey.com> wrote in message > >> >> news:eJaSDdN2JHA.5728@TK2MSFTNGP03.phx.gbl... > >> >> > >> > > >> >> > From the diagram the scopes are crossed. what do you mean by do not > >> >> > cross? > >> >> > > >> >> > Say I have a few scopes on one dhcp server > >> >> > > >> >> > 10.10.10.0 - 10.10.11.254 > >> >> > 10.10.12.0- 10.10.13.254 > >> >> > > >> >> > how do I split these up into 2 dhcp servers? > >> >> > >> >> > >> > > >> >> Maybe overlap should have been the better word than 'crossed.' > >> >> > >> >> For 50/50: > >> >> > >> >> Server1: > >> >> 10.10.10.1 - 10.10.10.254 > >> >> 10.10.12.1 - 10.10.12.254 > >> >> > >> >> Server2: > >> >> 10.10.11.1 - 10.10.11.254 > >> >> 10.10.13.1 - 10.10.13.254 > >> >> > >> >> Ace > >> > >> > > > > they are 255.255.254.0
Show quoteHide quote "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message news:%23SaVHdY2JHA.4412@TK2MSFTNGP06.phx.gbl... > Out of curiousity, what subnet mask are you using for those? > > -- > -Ben- > Ben M. Schorr, MVP > Roland Schorr & Tower > http://www.rolandschorr.com > http://www.officeforlawyers.com > Author - The Lawyer's Guide to Microsoft Outlook 2007: > http://tinyurl.com/5m3f5q > > > > "Joey" <j***@joey.com> wrote in message > news:eidO2DY2JHA.140@TK2MSFTNGP03.phx.gbl: > >> I have like 10 vlans >> >> it all goes like this >> >> 10.10.1.0 - 10.10.2.254 >> scope 10.10.1.50 - 10.10.2.254 >> >> 10.10.3.0 - 10.10.4.254 >> scope 10.10.3.50 - 10.10.4.254 >> >> 10.10.5.0 - 10.10.6.254 >> scope 10.10.5.50 - 10.10.6.254 >> >> and so on >> >> how do I break this up into 2 dhcp servers? These 2 dhcp servers should >> be >> on the same broadcast domain right (vlan)? >> >> "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message >> news:OwTxV6R2JHA.3304@TK2MSFTNGP06.phx.gbl... >> >> >I don't think there's any need to reserve the IP addresses. Just use >> >distinct scopes on each server that are all in the same subnet. >> > >> > We have a client that uses a Class B scheme. They use 172.23.x.x. >> > >> > Their servers are 172.23.1.x >> > Their workstations from one DHCP server are 172.23.2.x >> > Their workstations from the other DHCP server are 172.23.22.x >> > Remote workstations get 172.23.222.x >> > They have network devices (like printers, etc.) on 172.23.3.x >> > >> > Either DHCP server can carry their entire network by itself, and >> > there's >> > no overlap. If either server goes down the other carries the network. >> > And it's easy to tell which server a workstation got its address from >> > (.2 >> > or .22). >> > >> > It's simple, elegant, reliable and effective. >> > >> > -- >> > -Ben- >> > Ben M. Schorr, MVP >> > Roland Schorr & Tower >> > http://www.rolandschorr.com >> > http://www.officeforlawyers.com >> > Author - The Lawyer's Guide to Microsoft Outlook 2007: >> > http://tinyurl.com/5m3f5q >> > >> > >> > >> > "Bill Grant" <not.available@online> wrote in message >> > news:#bdQqtQ2JHA.480@TK2MSFTNGP06.phx.gbl: >> > >> >> >> Indeed. Each DHCP server must be capable of handling the complete load >> >> alone. >> >> >> >> With the 50/50 system, half of the available IP addresses are >> >> reserved >> >> on >> >> each DHCP server. If one server fails, removing the reservation allows >> >> all >> >> machines to use the one remaining server. >> >> >> >> "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in >> >> message >> >> news:exqxvPP2JHA.140@TK2MSFTNGP03.phx.gbl... >> >> >> >> >> > If you have THAT many clients then you need to select larger ranges. >> >> > >> >> > -- >> >> > -Ben- >> >> > Ben M. Schorr, MVP >> >> > Roland Schorr & Tower >> >> > http://www.rolandschorr.com >> >> > http://www.officeforlawyers.com >> >> > Author - The Lawyer's Guide to Microsoft Outlook 2007: >> >> > http://tinyurl.com/5m3f5q >> >> > >> >> > >> >> > >> >> > "Joey" <j***@joey.com> wrote in message >> >> > news:ehV0$bO2JHA.4744@TK2MSFTNGP04.phx.gbl: >> >> > >> >> >> >> >> >> If I do it this way and server 1 fails. what happens if server2 >> >> >> doesnt >> >> >> have >> >> >> any available lease addresses on either one of the ranges? >> >> >> "Ace Fekay [Microsoft Certified Trainer]" >> >> >> <ace***@mvps.RemoveThisPart.org> >> >> >> wrote in message news:u52XtIO2JHA.5772@TK2MSFTNGP02.phx.gbl... >> >> >> "Joey" <j***@joey.com> wrote in message >> >> >> news:eJaSDdN2JHA.5728@TK2MSFTNGP03.phx.gbl... >> >> >> >> >> >> >> >> >> > From the diagram the scopes are crossed. what do you mean by do >> >> >> > not >> >> >> > cross? >> >> >> > >> >> >> > Say I have a few scopes on one dhcp server >> >> >> > >> >> >> > 10.10.10.0 - 10.10.11.254 >> >> >> > 10.10.12.0- 10.10.13.254 >> >> >> > >> >> >> > how do I split these up into 2 dhcp servers? >> >> >> >> >> >> >> >> >> >> >> >> Maybe overlap should have been the better word than 'crossed.' >> >> >> >> >> >> For 50/50: >> >> >> >> >> >> Server1: >> >> >> 10.10.10.1 - 10.10.10.254 >> >> >> 10.10.12.1 - 10.10.12.254 >> >> >> >> >> >> Server2: >> >> >> 10.10.11.1 - 10.10.11.254 >> >> >> 10.10.13.1 - 10.10.13.254 >> >> >> >> >> >> Ace >> >> >> >> > >> >> > > You do realize that Ethernet looses efficiency after round 250-300
hosts,...so subnets should not go beyond the normal 245 host (255.255.255.0)? Lower bit masks are for supernetting within routing tables. -- Show quoteHide quotePhillip Windell The views expressed, are my own and not those of my employer, or Microsoft, or anyone else associated with me, including my cats. ----------------------------------------------------- "Joey" <j***@joey.com> wrote in message news:ekQ2R%23Z2JHA.5816@TK2MSFTNGP02.phx.gbl... > they are 255.255.254.0 > > "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message > news:%23SaVHdY2JHA.4412@TK2MSFTNGP06.phx.gbl... >> Out of curiousity, what subnet mask are you using for those? >> >> -- >> -Ben- >> Ben M. Schorr, MVP >> Roland Schorr & Tower >> http://www.rolandschorr.com >> http://www.officeforlawyers.com >> Author - The Lawyer's Guide to Microsoft Outlook 2007: >> http://tinyurl.com/5m3f5q >> >> >> >> "Joey" <j***@joey.com> wrote in message >> news:eidO2DY2JHA.140@TK2MSFTNGP03.phx.gbl: >> >>> I have like 10 vlans >>> >>> it all goes like this >>> >>> 10.10.1.0 - 10.10.2.254 >>> scope 10.10.1.50 - 10.10.2.254 >>> >>> 10.10.3.0 - 10.10.4.254 >>> scope 10.10.3.50 - 10.10.4.254 >>> >>> 10.10.5.0 - 10.10.6.254 >>> scope 10.10.5.50 - 10.10.6.254 >>> >>> and so on >>> >>> how do I break this up into 2 dhcp servers? These 2 dhcp servers should >>> be >>> on the same broadcast domain right (vlan)? >>> >>> "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in message >>> news:OwTxV6R2JHA.3304@TK2MSFTNGP06.phx.gbl... >>> >>> >I don't think there's any need to reserve the IP addresses. Just use >>> >distinct scopes on each server that are all in the same subnet. >>> > >>> > We have a client that uses a Class B scheme. They use 172.23.x.x. >>> > >>> > Their servers are 172.23.1.x >>> > Their workstations from one DHCP server are 172.23.2.x >>> > Their workstations from the other DHCP server are 172.23.22.x >>> > Remote workstations get 172.23.222.x >>> > They have network devices (like printers, etc.) on 172.23.3.x >>> > >>> > Either DHCP server can carry their entire network by itself, and >>> > there's >>> > no overlap. If either server goes down the other carries the network. >>> > And it's easy to tell which server a workstation got its address from >>> > (.2 >>> > or .22). >>> > >>> > It's simple, elegant, reliable and effective. >>> > >>> > -- >>> > -Ben- >>> > Ben M. Schorr, MVP >>> > Roland Schorr & Tower >>> > http://www.rolandschorr.com >>> > http://www.officeforlawyers.com >>> > Author - The Lawyer's Guide to Microsoft Outlook 2007: >>> > http://tinyurl.com/5m3f5q >>> > >>> > >>> > >>> > "Bill Grant" <not.available@online> wrote in message >>> > news:#bdQqtQ2JHA.480@TK2MSFTNGP06.phx.gbl: >>> > >>> >>> >> Indeed. Each DHCP server must be capable of handling the complete >>> >> load >>> >> alone. >>> >> >>> >> With the 50/50 system, half of the available IP addresses are >>> >> reserved >>> >> on >>> >> each DHCP server. If one server fails, removing the reservation >>> >> allows >>> >> all >>> >> machines to use the one remaining server. >>> >> >>> >> "Ben M. Schorr - MVP (OneNote)" <b***@bogusaddress.mvp> wrote in >>> >> message >>> >> news:exqxvPP2JHA.140@TK2MSFTNGP03.phx.gbl... >>> >> >>> >>> >> > If you have THAT many clients then you need to select larger >>> >> > ranges. >>> >> > >>> >> > -- >>> >> > -Ben- >>> >> > Ben M. Schorr, MVP >>> >> > Roland Schorr & Tower >>> >> > http://www.rolandschorr.com >>> >> > http://www.officeforlawyers.com >>> >> > Author - The Lawyer's Guide to Microsoft Outlook 2007: >>> >> > http://tinyurl.com/5m3f5q >>> >> > >>> >> > >>> >> > >>> >> > "Joey" <j***@joey.com> wrote in message >>> >> > news:ehV0$bO2JHA.4744@TK2MSFTNGP04.phx.gbl: >>> >> > >>> >> >>> >>> >> >> If I do it this way and server 1 fails. what happens if server2 >>> >> >> doesnt >>> >> >> have >>> >> >> any available lease addresses on either one of the ranges? >>> >> >> "Ace Fekay [Microsoft Certified Trainer]" >>> >> >> <ace***@mvps.RemoveThisPart.org> >>> >> >> wrote in message news:u52XtIO2JHA.5772@TK2MSFTNGP02.phx.gbl... >>> >> >> "Joey" <j***@joey.com> wrote in message >>> >> >> news:eJaSDdN2JHA.5728@TK2MSFTNGP03.phx.gbl... >>> >> >> >>> >> >>> >>> >> >> > From the diagram the scopes are crossed. what do you mean by do >>> >> >> > not >>> >> >> > cross? >>> >> >> > >>> >> >> > Say I have a few scopes on one dhcp server >>> >> >> > >>> >> >> > 10.10.10.0 - 10.10.11.254 >>> >> >> > 10.10.12.0- 10.10.13.254 >>> >> >> > >>> >> >> > how do I split these up into 2 dhcp servers? >>> >> >> >>> >> >> >>> >> >>> >>> >> >> Maybe overlap should have been the better word than 'crossed.' >>> >> >> >>> >> >> For 50/50: >>> >> >> >>> >> >> Server1: >>> >> >> 10.10.10.1 - 10.10.10.254 >>> >> >> 10.10.12.1 - 10.10.12.254 >>> >> >> >>> >> >> Server2: >>> >> >> 10.10.11.1 - 10.10.11.254 >>> >> >> 10.10.13.1 - 10.10.13.254 >>> >> >> >>> >> >> Ace >>> >> >>> >> > >>> >>> > >> > >  
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