Weird access problem

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http://forums.fedoraforum.org – I have spent over 30 years researching and designing networks - from the time before there was an internet, or tcp/ip, or even ethernet - so I'm not exactly a noob with regards to networking. But this problem has me stumped. And I've had this same problem before, with previous version of Fedora, and it seemed to get resolved only when I upgraded to a newer version of Fedora. Anyways, here's the problem: I have three computers. All are connected to the same switch, which is connected to my firewall (a cisco pix), which is connected to my DSL router. Two of these boxes are running Fedora 1 (HowTos)