DHCP Weirdness Across Subnets

15 pts.
Microsoft Windows Server 2003
I'm currently an active participant in the tasks that will ulitmately cost me my job due to a recent acquisition and subsequent restructuring. Our network is while the acquiring company's network is They're connected by a Cisco 1721 router across a frame relay circuit and have been for one month. I arrived at work this morning to complaints about printing problems. My initial ts revealed ip info that was mostly correct, with the exception of DNS server addresses assigned to the clients...these were the acquiring company's DNS server addresses and not ours. A simple release and renew corrected the problem and gave our clients the correct DNS server on our side. Any ideas about how this may have happened? I'm thinking that maybe the IT folks on the other side changed something or possibly activated a scope on their end, but haven't been able to get much info out of them. Sabotage maybe?

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Sounds like maybe DHCP helper is running on the router between your networks. Unless you need it to service DHCP or a backup DHCP server exists across the WAN, I would suggest turning off DHCP helper on the router.

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  • MoveOver
    IP helper has been enabled on the f0 interface of the 1721 since we stood the frame up a month and a half ago. I'm guessing they made some changes to our scope or even activated it on their DHCP server, even though we're not ready to put it into production. Anyway, I logged into the router and peeled off the ip helper config - we now get the correct DNS server address on our side. I appreciate the input Labnuke99.
    15 pointsBadges:
  • LabNuke
    Glad to assist! It's nice when the issue turns out to be one of the first things you try ;)
    90 pointsBadges:
  • Jerry Lees
    Good call Labnuke! I love it when a plan comes together and things are as easy as the first thing you try... and good luck in your impending search MoveOver. Those situations always stink.
    5,335 pointsBadges:

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