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IP Address NACK

By daniel ·
We recently started receiving messages in the event log of the PDC at our main location stating "The DHCP server issued a NACK to the client for address 10._____ request ______. However, I am unable to locate that IP address on the network to see what device is causing this. I am assuming the 10.__.__.__ address is a local network address, however, it also appeared on another of our LANs that isn't connected to our main location. We all use the same data processor, but I do not know why a 10.__.__ address would be attempting to get an address from DHCP.

First of all, any possible explanation to this, and second, how would I temporarily exclude this address so Event log wont get filled up with these messages (approx. every 2 minutes there is an entry). Since that address is not in the scope I cannot exclude it. I think there may be a way to add the station so this wont happen, although I am unsure how to do it.

Thanks,

Dan Buonocore

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IP Address NACK

by Stillatit In reply to IP Address NACK

You are getting this message because some DHCP client on your net has or had an address from a DHCP server in the range 10.x.x.x, it is broadcasting a renew request, and your server does not give out addresses in that range.

This happens when someone on your net brings up their own DHCP server to play with, not realizing that real stations will get addresses from it. It may also be the result of a dial-up box (Shiva, etc., or a vpn server) giving out addresses in this range.

If you do notuse network 10 addresses on your net, here is how to find the culprit:
1. Using any shareware scanner, find the 10.x.x.x addresses on your network.
2. For each one, from a command prompt, type NBTSTAT -A <address> which will list their netbios machine name, which should help you track them down.

For each station you find, use (NT) ipconfig /all or (Win9x) winipcfg on the station to find the address of the DHCP server which gave them the 10.x.x.x address.

Good luck.

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IP Address NACK

by daniel In reply to IP Address NACK

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IP Address NACK

by daniel In reply to IP Address NACK

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