[lug] Linux Router swallowing UDP

[Andy Jolley]

I'm trying to setup a testlab environment at work to simulate an environment separated by a Nokia IP440 router (it runs IPSO OS which is a slimmed down BSD I think...).  Since those guys are so incredibly expensive, I'm trying to do the same thing with a Linux box.  I have IP and ICMP routing with absolutely no issues, but my UDP packets are not passing through the box.  I do a tcpdump and see them hitting eth0, but not coming out eth1, or back out eth0 for that matter.  My traceroutes show me the hops I expect around our network.
I'm using the stock Red Hat 7.0 CD's (it's required for the versions of Linux compatible software I'm loading, so 7.1 isn't an option).  Is there a mod I'm missing for routing UDP?
One of the steps I took, was to try the install everything option on setup, figuring I could slim it down after I got it working, after all it is a test environment.
I need for our development department to be able to log into WinNT/2k through this router.  Also I have some other hardware, specifically RadWare's WSD Pros, in the test environment that are managed via SMNP, so getting UDP to route through this box is pretty important.
Any ideas out there?

Thanks
Andy Jolley
LAN/WAN Administrator
First Trust Corporation
jolley at firsttrust.com