Are you sure that your DHCP clients are getting the WINS servers entered into the network interface card properties, in TCP/IP properties. Sounds like WINs is the culprit here. Go into your NIC properties and see if the correct WINS servers are listed. Also you can check your WINS service to ensure hosts are properly registering.
I do not think that will help too. I have almost the same setup. An IP helper on every vlan (subnet). What I have added if a no IP forward for the netbios stuff.
no ip forward-protocol udp netbios-ns
no ip forward-protocol udp netbios-dgm
So that the helper will not forward this kind of broadcasts but that is in your case not the issue. Can't you do some debugging on the network (in the core using accesslists and debug ip packet) to see what happens with the wins requests? Good luck!
We have the same Network system over 45 VLAN, you need to check one Windows 2000 server DNS and Wins and compare with Win2K Pro. DNS and WINS (ipconfig /all). For testing use static DNS and WINs on Win2k-Pro also check DNS suffix for this connection XXXX.com?.
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