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Today's discovery is that if you're foolish enough to enable DHCP on an alternate network interface (eth3, in my case) on Linux, then the DHCP client will overwrite your hand-configured default route that actually works with the one it received from the DHCP server.
Which is not particularly helpful when eth3 is connected to a different LAN with a router that actually checks the IP addresses of packets it forwards. At which point it eats the SSH connection I was using (because that was to an IP address on eth0) and I had to wander down to the lab and dig out a keyboard and monitor.
I am becoming more and more convinced that the Linux network stack just Does Not Work as soon as you plug it into more than one network.
Which is not particularly helpful when eth3 is connected to a different LAN with a router that actually checks the IP addresses of packets it forwards. At which point it eats the SSH connection I was using (because that was to an IP address on eth0) and I had to wander down to the lab and dig out a keyboard and monitor.
I am becoming more and more convinced that the Linux network stack just Does Not Work as soon as you plug it into more than one network.