ip helper-address and Windows Servers

[gordon.hawkins]

My windows servers in my domain are in multiple subnets. This works out fine, but a problem does arise when using the "ip helper-address" command in my router to forward UDP broadcasts to the DHCP server from other VLANs than the one the DHCP server lives in.

I continually get MRxSmb (event 8003) errors on all the DCs. Removing the "ip helper-address" command solves the problem, but then slowly my clients lose their DHCP leases.

MS says that this issue is to do with UDP broadcasts, apparently they mess around with the master browser in 2K. Here's the MS articles:

http://support.microsoft.com/default.aspx?scid=kb;en-us;135464&Product=win2000

http://support.microsoft.com/default.aspx?scid=kb;en-us;190930&Product=win2000

My question is... Does anyone have experience with this issue and know how to fix it? (keeping the job of the ip helper-address command intact)

Thanks!

[b.bledsoe]

Try these commands on the routers with the helper statements:

no ip forward-protocol udp netbios-ns

no ip forward-protocol udp netbios-dgm

[gordon.hawkins]

That did the trick, thank you!

[wbowlin]

Can you foward only dhcp request from VLANS without a DHCP server to the VLAN with the DHCP server. Currently we have the IP-Helper address for the VLANS set to the DHCP server but from what I understand all broadcast are forwarded to the server.