I have installed Fedora Core 4 on my firewall machine. My networked machines can browse the web, but I cannot access the loopback device, eg, for SWAT configuration.
ifconfig lo shows the loopback interface to be UP and RUNNING at inet addr 127.0.0.1
ping localhost results in 100% packet loss
The routing tables do not show a loopback entry, and if I try to add one I get errors.
Can anyone tell me what's going on?