Recently I noticed that my internet connection would not work correctly-although connected domain names could not be resolved. My resolv.conf file was fine since it is configured every time I dial up. a closer inspection showed that my loopback interface had disappearerd! Any ideas why would this be? Although I could bring it back by restarting networking ..I never had to do this before as loopback was always configured on boot.
If I opt to now configure networking on boot then eth0 will also try to configure itself which I dont want outside of work! I can manually do 'ifconfig lo up' but I never had to do this before either...so where has my loopback gone 
? I am running redhat 7.3
any pointers greatly appreciated