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DHCP reconcile all records under DHCP server on server 2003 ent edition

Posted on 2007-09-28
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Hello all
I am running server 2003 ent edition domain.  I have 2 dhcp servers, when I right click on one of the dhcp server and click reconcile all records, it shows me so many ip's.  Whereas if I click on the other server and click reconcile alll records it shows the database is consistent.  How can I correct the problem in the first server.
I am also getting a lot of IP conflicts on my domain on my clients.
THanks
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Question by:amanzoor
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by:avilov
ID: 19981881
how many active DHCP servers do you have?
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by:amanzoor
ID: 19982799
avilov:
i have 2 active dhcp servers.
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avilov earned 2000 total points
ID: 19982933
do they have exactly the same configuration? did you split the all IP between then?

like that or something similar

DHCP Server 1:
192.168.1.1 - 192.168.1.254
Exclusion: 192.168.1.128 - 192.168.1.254
Reservations:    server 1 - 192.168.1.x
Reservations:    server 2 - 192.168.1.y
.....

DHCP Server 2:
192.168.1.1 - 192.168.1.254
Exclusion: 192.168.1.1 - 192.168.1.127
Reservations:    server 1 - 192.168.1.x
Reservations:    server 2 - 192.168.1.y

DHCP is based on broadcast, that means that either server could pickup the request for IP. If you didn't split network like in the example above, you can end up with workstation that have duplicate IPs. That will create lots of problem. If you split the network, you'll be always sure that no duplicates are on your network and all reservations are correctly assigned.

just make sure that you do have redundancy in your DHCP servers have enough IPs avalable on each DHCP server for whole network, in case if one of the servers fail
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Author Comment

by:amanzoor
ID: 19985987
Avilov:
Thanks I will check and compare my dhcp with the config you have mentioned.  I will let you know by the end of Monday how it goes.
THanks
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Author Comment

by:amanzoor
ID: 19995809
Avilov:
Thanks for your guidance, I have no more ip conflicts:
Another thing, on server 2 when I click on 'Reconcile all records' it gives me bunch of ip addresses, whereas on server 1 when I do the same it says the database is consistent.  Is it right on server 2 ?  Help!
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Expert Comment

by:avilov
ID: 19996004
Did you actually reconciled all scopes on the server 2? Just do it and your registry and the DHCP databace will be in sync after that

here is a quick intro in reconciling

Reconcile is a technical term for making sure that DHCP information is consistent.  What can happen is that  there is a miss-match between lease information in the database and the same information in the DHCP server's registry.  Specifically, the registry just stores basic or summary information,  so a 'Reconcile' will ensure that the database and registry data are consistent

Bear in mind that you can either reconcile individual scopes or choose all scopes.  It all depends on the 'focus' of what you select.  If you select an individual scope that that is the limit of what you can reconcile, however, when you select the server icon, you can: Reconcile All Scopes.
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Author Comment

by:amanzoor
ID: 19998307
avilov:
Does not matter if I select server 2 'reconcile all scope' or scope 'reconcile scope' upon clicking verify I get lots of ip addresses.  Whereas my server 1 has all database consistent.
Till now I did't get any IP Conflicts though.
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Author Comment

by:amanzoor
ID: 20003575
Avilov:
Got it infact when the ip addresses appear I have to then select verify and then it says the database is consistent.
THanks for your support I really appreciate your time.
THanks
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