Silly Question ....

FirebarUK · 26 Apr 2006 at 15:47

Whats the easiest way via the command line in Linux (or whatever) to see what speed your network interface is negotiating at? e.g; 100Mbps full, or 10 half etc.

Ta.

Berserker · 26 Apr 2006 at 16:28

In the simplest case, good ol'

Code:

dmesg

may do the trick. Look for something like this:

Code:

eth0: Media Link On 100mbps full-duplex

There's probably a more complete answer though.

Vonhelmet · 26 Apr 2006 at 16:31

Heh. I didn't think of good old dmesg! The usual suspects would be ifconfig or ifstat, but I've checked and neither do it. Dmesg it is.

Hmm... I just tried that on a server I run and dmesg just returns loads of iptables stuff. Odd. I might have something set up wrong, or it might be that iptables messages go there or something, I don't know.

Berserker · 26 Apr 2006 at 16:32

I also checked ifconfig first, but then remembered I'd seen it in dmesg.

doaa · 26 Apr 2006 at 16:36

dmesg is the best solution I know, I use the following command (or a variation of)

$ dmesg | grep Mbps | grep eth0

Berserker · 26 Apr 2006 at 17:00

doaa said:
$ dmesg | grep Mbps | grep eth0

[pedant] That would fail to spot my (genuine) example. [/pedant]

$ dmesg | grep -i Mbps | grep eth0

FirebarUK · 26 Apr 2006 at 17:16

Makes sense, thanks. Reason I say is because ifconfig won't return anything relating to negotiation speed (at least my version of the tools?).