So I had to unplug the Xen server's NIC. When I was done, I plugged it back in, and attempted to SSH into it. Fails. But my connections to the guests work perfectly fine. They're still up and running with the extra IP address.
The HOST is not! Dom0 has no network connection, as far as it's concerned.
The xenbr0 adapter has the correct address that it should, but it cannot ping anything on the local network. route shows the correct gateway address for the network (it's assigned via /etc/network/interfaces anyways). The guests have their regular IP addresses, and I can connect to them OK. Running ifup xenbr0 or ifup eth0 returns a message that it's already up. I don't want to take them down, if possible.
Other than restarting, what do you suppose the issue is, and how to fix? I just want to see if I can fix it without a reboot. Both Debian-based OSes.
The issue was that I still had
eth0as an auto-connection with DHCP. It got plugged in, grabbed the same IP address, and had a conflict.I solved this by editing
/etc/network/interfaces, and changing the line:to
I then took down
eth0(ifdown eth0) and brought it back up (ifup eth0). Then I could ping systems and access it from SSH.