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DHCP serversHi,
I have 2 DHCP servers they are also our Windows 2003 domain controllers. Thing is DC1 seems to service all the DHCP reqests, but why? DC1 has all the FSMO roles, so could that be it? Both servers are on the same subnet too, DC2 has have 100's of discoveries when I look at the DHCP stats, but no offers, requests or acks. it is probably always the first one to respond
-- Show quoteHide quoteCheers, (HOPEFULLY THIS INFORMATION HELPS YOU!) # Jorge de Almeida Pinto # MVP Identity & Access - Directory Services # BLOG (WEB-BASED)--> http://blogs.dirteam.com/blogs/jorge/default.aspx BLOG (RSS-FEEDS)--> http://blogs.dirteam.com/blogs/jorge/rss.aspx ------------------------------------------------------------------------------------------ * This posting is provided "AS IS" with no warranties and confers no rights! * Always test ANY suggestion in a test environment before implementing! ------------------------------------------------------------------------------------------ ################################################# ################################################# ------------------------------------------------------------------------------------------ "Cyborg" <apoll***@btinternet.com> wrote in message news:E45084B6-1F15-4C1D-8A71-FF2428810BAC@microsoft.com... > Hi, > > I have 2 DHCP servers they are also our Windows 2003 domain controllers. > Thing is DC1 seems to service all the DHCP reqests, but why? DC1 has all > the FSMO roles, so could that be it? > > Both servers are on the same subnet too, DC2 has have 100's of discoveries > when I look at the DHCP stats, but no offers, requests or acks. Yeah you are right, the 2 core switches had the 2 servers define and not the
new one, so basically the first DHCP server was the only one being seen, I updated the Core switches to also include the new DHCP server and all is good now. "Jorge de Almeida Pinto [MVP - DS]" <SubstituteThisWithMyFullNameSeparatedByD***@gmail.com> wrote in message Show quoteHide quote news:OYfvJj5XJHA.4596@TK2MSFTNGP06.phx.gbl... > it is probably always the first one to respond > > -- > > Cheers, > (HOPEFULLY THIS INFORMATION HELPS YOU!) > > # Jorge de Almeida Pinto # MVP Identity & Access - Directory Services # > > BLOG (WEB-BASED)--> http://blogs.dirteam.com/blogs/jorge/default.aspx > BLOG (RSS-FEEDS)--> http://blogs.dirteam.com/blogs/jorge/rss.aspx > ------------------------------------------------------------------------------------------ > * This posting is provided "AS IS" with no warranties and confers no > rights! > * Always test ANY suggestion in a test environment before implementing! > ------------------------------------------------------------------------------------------ > ################################################# > ################################################# > ------------------------------------------------------------------------------------------ > > "Cyborg" <apoll***@btinternet.com> wrote in message > news:E45084B6-1F15-4C1D-8A71-FF2428810BAC@microsoft.com... >> Hi, >> >> I have 2 DHCP servers they are also our Windows 2003 domain controllers. >> Thing is DC1 seems to service all the DHCP reqests, but why? DC1 has all >> the FSMO roles, so could that be it? >> >> Both servers are on the same subnet too, DC2 has have 100's of >> discoveries when I look at the DHCP stats, but no offers, requests or >> acks. > Both are authorized DHCP servers on AD?
And yes, the first one that receives the request will automatically respond to the client. Why do you have two DHCP servers on the same subnet? One DHCP and different and consolidated scopes are not enough? Cheers "Cyborg" <apoll***@btinternet.com> escribió en el mensaje de noticias:E45084B6-1F15-4C1D-8A71-FF2428810***@microsoft.com...Show quoteHide quote > Hi, > > I have 2 DHCP servers they are also our Windows 2003 domain controllers. > Thing is DC1 seems to service all the DHCP reqests, but why? DC1 has all > the FSMO roles, so could that be it? > > Both servers are on the same subnet too, DC2 has have 100's of discoveries > when I look at the DHCP stats, but no offers, requests or acks. redundancy
<augusto.alvare***@gmail.com> wrote in message Show quoteHide quote news:28A21909-1980-4086-81D2-20F1B46C4230@microsoft.com... > Both are authorized DHCP servers on AD? > > And yes, the first one that receives the request will automatically > respond to the client. > > Why do you have two DHCP servers on the same subnet? One DHCP and > different and consolidated scopes are not enough? > > Cheers > > -- > > augusto alvarez | it professional > MCP - MCTS - MCITP DBA > http://blog.augustoalvarez.com.ar/ > > > "Cyborg" <apoll***@btinternet.com> escribió en el mensaje de > noticias:E45084B6-1F15-4C1D-8A71-FF2428810***@microsoft.com... >> Hi, >> >> I have 2 DHCP servers they are also our Windows 2003 domain controllers. >> Thing is DC1 seems to service all the DHCP reqests, but why? DC1 has all >> the FSMO roles, so could that be it? >> >> Both servers are on the same subnet too, DC2 has have 100's of >> discoveries when I look at the DHCP stats, but no offers, requests or >> acks. > Hi
DHCP renews are sent to the last DHCP server where the IP came from 50% before expires the lease. My guess is that your 1 DHCP was the onlyone to offer the IPs and now all clients are using it until it becomes unavailable to ofter new IPs. But you can have other problems, for example check if the DHCP service is working correctly on the other server, also check if the DHXP is authorized in AD, search for event errors, etc... -- Show quoteHide quoteI hope that the information above helps you. Have a Nice day. Jorge Silva MCSE, MVP Directory Services Please no e-mails, any questions should be posted in the NewsGroup This posting is provided "AS IS" with no warranties, and confers no rights. "Cyborg" <apoll***@btinternet.com> wrote in message news:E45084B6-1F15-4C1D-8A71-FF2428810BAC@microsoft.com... > Hi, > > I have 2 DHCP servers they are also our Windows 2003 domain controllers. > Thing is DC1 seems to service all the DHCP reqests, but why? DC1 has all > the FSMO roles, so could that be it? > > Both servers are on the same subnet too, DC2 has have 100's of discoveries > when I look at the DHCP stats, but no offers, requests or acks. How do you have these defined and are helper addresses pointing to both dhcp
servers? If you have two dhcp servers on the same subnet you would want tosplit the pool range, not sure if you have done this. Not a good idea for both to have a 100% of the available addresses available. -- Show quoteHide quotePaul Bergson MVP - Directory Services MCTS, MCT, MCSE, MCSA, Security+, BS CSci 2008, 2003, 2000 (Early Achiever), NT4 http://www.pbbergs.com Please no e-mails, any questions should be posted in the NewsGroup This posting is provided "AS IS" with no warranties, and confers no rights. "Cyborg" <apoll***@btinternet.com> wrote in message news:E45084B6-1F15-4C1D-8A71-FF2428810BAC@microsoft.com... > Hi, > > I have 2 DHCP servers they are also our Windows 2003 domain controllers. > Thing is DC1 seems to service all the DHCP reqests, but why? DC1 has all > the FSMO roles, so could that be it? > > Both servers are on the same subnet too, DC2 has have 100's of discoveries > when I look at the DHCP stats, but no offers, requests or acks. All sorted, the core switches were defining the 2 DHCP servers, all works
now. the pool ranges are split and both are authorised. Show quoteHide quote "Paul Bergson" <pbbergs@nospammsn.com> wrote in message news:60272564-9705-427A-9447-058879FE3678@microsoft.com... > How do you have these defined and are helper addresses pointing to both > dhcp servers? If you have two dhcp servers on the same subnet you would > want tosplit the pool range, not sure if you have done this. Not a good > idea for both to have a 100% of the available addresses available. > > -- > Paul Bergson > MVP - Directory Services > MCTS, MCT, MCSE, MCSA, Security+, BS CSci > 2008, 2003, 2000 (Early Achiever), NT4 > > http://www.pbbergs.com > > Please no e-mails, any questions should be posted in the NewsGroup This > posting is provided "AS IS" with no warranties, and confers no rights. > "Cyborg" <apoll***@btinternet.com> wrote in message > news:E45084B6-1F15-4C1D-8A71-FF2428810BAC@microsoft.com... >> Hi, >> >> I have 2 DHCP servers they are also our Windows 2003 domain controllers. >> Thing is DC1 seems to service all the DHCP reqests, but why? DC1 has all >> the FSMO roles, so could that be it? >> >> Both servers are on the same subnet too, DC2 has have 100's of >> discoveries when I look at the DHCP stats, but no offers, requests or >> acks. > Hello Cyborg,
I use 2 DHCP servers in the same subnet with a split scope (50/50) and both of them are in use. Make sure the servers are both authorized in AD. If they have different hardware, one powerful and one slower machine, then mostly the powerful will win, because first come, first serve will work in the case of more then one DHCP server. Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties, and confers no rights. ** Please do NOT email, only reply to Newsgroups ** HELP us help YOU!!! http://www.blakjak.demon.co.uk/mul_crss.htm Show quoteHide quote > Hi, > > I have 2 DHCP servers they are also our Windows 2003 domain > controllers. Thing is DC1 seems to service all the DHCP reqests, but > why? DC1 has all the FSMO roles, so could that be it? > > Both servers are on the same subnet too, DC2 has have 100's of > discoveries when I look at the DHCP stats, but no offers, requests or > acks. > Very similar to mine, the DHCP servers were defined in our Core switches,
this is now been updated and working. Show quoteHide quote "Meinolf Weber [MVP-DS]" <meiweb(nospam)@gmx.de> wrote in message news:ff16fb6610bf28cb2de513179f11@msnews.microsoft.com... > Hello Cyborg, > > I use 2 DHCP servers in the same subnet with a split scope (50/50) and > both of them are in use. Make sure the servers are both authorized in AD. > If they have different hardware, one powerful and one slower machine, then > mostly the powerful will win, because first come, first serve will work in > the case of more then one DHCP server. > > Best regards > > Meinolf Weber > Disclaimer: This posting is provided "AS IS" with no warranties, and > confers no rights. > ** Please do NOT email, only reply to Newsgroups > ** HELP us help YOU!!! http://www.blakjak.demon.co.uk/mul_crss.htm > >> Hi, >> >> I have 2 DHCP servers they are also our Windows 2003 domain >> controllers. Thing is DC1 seems to service all the DHCP reqests, but >> why? DC1 has all the FSMO roles, so could that be it? >> >> Both servers are on the same subnet too, DC2 has have 100's of >> discoveries when I look at the DHCP stats, but no offers, requests or >> acks. >> > > 
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