[lug] Linux Router swallowing UDP

[Jonathan Briggs]

Some things to check just off the top of my head:

Are the UDP packets addressed to a broadcast address?  If they are, they 
will not be routed.  

Is the firewall active?  Redhat 7.0 might come with a default firewall 
setup.  (I haven't looked lately)

Does your router have a route to the packet's destination or a default 
route?

Andy Jolley wrote:

>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
>
>_______________________________________________
>Web Page:  http://lug.boulder.co.us
>Mailing List: http://lists.lug.boulder.co.us/mailman/listinfo/lug
>