Load-balancing your DHCP has been well documented, but the matter of synchronizing your IP reservations has always the fly in the ointment. But no more.
To export DHCP reservations, from the source server:
netsh dhcp server [ip address] scope [scope address] dump>reserv.txt
Open up ‘reserv.txt’ in a text editor, do a Find->Replace for the source server IP, change to the destination server IP. Trim out everything in the file except for the reservations themselves.
On the destination server, make sure your scope is already created, and run the following command:
netsh exec C:\reserv.txt
Tada. The only problem is that as your add more and more reservations, you’ll need to add them to each server that you are load balancing. It’s easier to do that than to do another export.
You know what would be kool?...... 
I would like to see a continuation of the topic
Have anything in particular in mind?
lets say you have to expand your scope because you are out of IP’s on your network.. and say you wish to export you old reserves from the original scope into the new expanded scope.. but using the commands above give you
“The scope parameter are incorrect. Either the scope already exists or it’s subnet address and mask is inconsistent with the subnet address and mask of the existing scope”
I did change the subnet of the new scope, so how does one import the reserves.?. please 🙂
ok I got this to work by manually editing the exported txt file and first removing the information at the top that was to create the new scope, then changed the reservation scopes that were listed to reflect the new scope and it imported as it should.. always happens once you post something you figure it out.. hope it helps someone else out there 😉 cheers!
Brilliant! Worked like a charm. Thanks!
This works for 08 as well just FYI
Thx, worked perfectly 🙂
I have been looking for this for sometime. God bless you…..
Hi, just seen this after having a bit of a nightmare with my DHCP database, it was something i overlooked in the backup schedule and lost the server, thankfully managed to export IP and MAC addresses from a netowkr monitor system and netsh them in as reservations via txt file so all was ok in the end.
This is a great method to sync IP’s across 2 servers, is there anyway to batch file and automate this maybe?
****DHCP BATCH FILE START
netsh dhcp server [ip address] scope [scope address] dump>reserv.txt
EDIT THE RESERV.TXT FILE SOME WAY TO UPDATE DHCP TARGET SERVER IP
netsh exec C:\reserv.txt
****DHCP BATCH END
ThanX man… It does helps a lot!!!
Can anyone guide me how to do it on multiple scope and with reservation each scope?
Thanks!
R
For multiple scopes use:
netsh dhcp server [ip address] dump>reserved.txt
Don’t forget to replace the IP of the target server before running netsh exec.
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Great info many thanks
Thanks for the info. One note, I migrate a W2003 to W2008 and have create the scope, not working. Delete the scope in the final server run the line and all Ok.
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Thank You very Much …. 100% working.
Thanks a lot for this. We’re going through a dhcp scope consolidation and change right now and this saved me a lot of work.
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Any idea what this will do with duplicate entries? Will it overwrite, ignore or actually duplicate an entry that already exists?
Nevermind. I shot from the hip and tried an import with known duplicates and they just error’d out. Sweet!
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Works with 2012 as well, and after then just right click the server and choose for replicating the scopes.
that’s it.
Thank you:)
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