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When I do ifconfig on my laptop I get HWaddr ec and than an address, this is next to eth0. Note that my IPv4 address only appears next to eth1 so I assume my laptop uses the eth1 network interface.

I assume my fixed pc uses the eth0 network interface because when I did ifconfig from there it did not display eth1, only eth0. What is strange though is that the HWaddr displayed next to eth0 from my fixed computer is different from the HWaddr next to eth0 when I do ifconfig on my laptop.


This is on my home network. There is a gateway which is connected to dsl. It connects to 1 wireless transceiver device and 2 fixed computers. At the moment of me doing ifconfig one fixed computer was connected to the internet. And one(my laptop) computer was accessing wireless internet.

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Are you sure those aren't just the first two digits of the MAC? – Oliver Salzburg May 12 '12 at 9:38
up vote 3 down vote accepted

It is possible that the ec you're seeing is actually the first part of your actual MAC address.

This can be somewhat confusing because ifconfig lists a lot of the information parameters by separating name and value with a :. The output for the MAC address differs.

enter image description here

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HWaddr is the MAC address of your network card so it must be different for every network card in the world.

Your laptop has multiple network cards eth0 end eth1 are the referring to those 2 cards (presumably a wired and wireless car)

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I know that HWaddr is the MAC address, but my question was what the ec part meant. But anyway, I didn't know that eth0 and eth1 always refer to the network interface controllers of the computer that you ifconfig on. – Bentley4 May 11 '12 at 15:03

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