Hi Thomas,
The debug condition command is pretty simple, it doesn’t work with and/or operators. For example if you enable “debug condition int fa0/0” then it will only show debug information for that interface. When you add “debug condition int fa0/1” then it will also show debug information from fa0/1, that’s it. It’s not like it will now match on traffic that enters fa0/0 and exits fa0/1 (or vice versa). It works more like access-list statements, if it matches…the debug info will show up, if it doesn’t match then you don’t see it.
Debug ip will show anything, traffic that is originated by the router and traffic that it receives from other devices.
Rene