[CentOS] Info about the NIC

Thu Mar 20 10:17:30 UTC 2008
Peter Kjellstrom <cap at nsc.liu.se>

On Wednesday 19 March 2008, Anne Wilson wrote:
> On Wednesday 19 March 2008 08:37:21 Tronn Wærdahl wrote:
...
> > I wounder about RX bytes and TX bytes, what does it mean, how does it
> > collect its data
>
> RX= received, TX = transmitted.
>
> > How often does it zero the counters, every boot, hour or somethings
> > else?. Is the information reliable
>
> As far as I know, it zeros on boot.

On interface-bring-up actually :-) (not that far away).

> And yes, it is reliable. 
> However, 'transmitted' will include checksums etc.

Yes, this is bytes on ethernet level, not aware of higher levels (like 
tcp/ip).

Also, these counters are wrapping counters (32-bit on i386 (wraps every now 
and then), 64-bit on x86_64 ("never" wraps)).

/Peter

> , so won't match exactly 
> to a file length.  Not an expert explanation, but adequate, I think :-)
>
> Anne
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