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Is it possible to start the network interface in debug mode? I am looking for Something like "sshd -ddd" but for a network interface. Basically I am looking for a redhat based solution.

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Define "debug mode". –  psusi May 4 '13 at 17:06

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A network interface cannot be "started in debug mode", however, if you want to inspect the network traffic specifically for one interface, the simplest and most commonly used solution is to use tcpdump(8). One example would be:

# tcpdump -vvv -s0 -i $interface

Check the manpage for further options.

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