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I have 5 boxes, all with internal 10.0.0.0 addresses. The set up:
Box 1 is Win2K Server, IP 10.0.0.1
Box 2 is Win98, IP 10.0.0.2
Box 3 is Red Hat 9, IP 10.0.0.10
Net mask is 255.0.0.0 for everyone.
Boxes 2 and 3 are on the same hub (downstairs). Box 1 and the unnamed boxes are on the same hub, with a downlink to the other hub where Boxes 2 and 3 are. Everyone was living happy and content and all could connect as needed.
Then I went on vacation. I needed to borrow some Cat-5 for on-the-road connectivity, so I took the chunk from the hub downstairs to Box 3 (Linux) (this is a red herring!). Then I shut Boxes 2 and 3 down, which does not happen often.
So I come back, boot up Box 3, and no connection from Box 1 to Box 3. Oops, forgot the cable. Patch it in, and still no connection from Box 1 (using PuTTY). Figure Box 3 didn't boot right, and reboot it. Still no joy. Hook up a monitor, and start pinging all over the place. I can ping Box 2 (on the same hub), but not Box 1 (on the upstairs hub). I jump on Box 2, and I can ping both Box 3 (Linux, on the same hub) and Box 1 (Win2K, on the hub upstairs), so it can't be a hub problem.
In short, Box 2 (on the same hub as Linux) can ping and get pinged by everyone. Box 1 can ping everyone except Box 3. Box 3 can ping no one except Box 2, on its same hub, and can get pinged by no one except Box 2.
To further add to the mess, even though Box 2 can ping Box 3, it cannot open an http session with it, even though httpd is running on Box 3.
It seems like the routing table on Box 3 is hosed, or something?