[ubuntu] Routing problems with two interfaces

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http://ubuntuforums.org – I run a small, low power machine with two interfaces as a file and torrent server. Both interfaces are on the same LAN. I typically assign different services to different interfaces, such as AFP, SMB, SSH to one and the Azureus to the other. This has worked fine in 8.04 but with 10.04 if I bring up the machine with both interfaces active packets cannot find their way back through my firewall (LAN traffic is fine). A traceroute stops right at my firewall. This is not exclusive to my network environment, either- I've tested with a virtual machine at work as well and packets cannot find thei (HowTos)