Reading some logs from my system it states
eth0: flags 4163 < up, broadcast, running, multicast> mtu
I am not sure what is the meaning of the flag here down below I see eth1,2,3 has the same flag ? I searched in google but nothing really helpful my other question is related to mtu- maximum transmitted unit- which means that the size of the largest protocol data unit that can be communicated in a single network layer transaction. however the mtu relates to but is not identical to the maximum frame size - I do not understand this one here . what is the difference between pdu and frame size I thought they are both identical