RE: [cobalt-users] RAQ4 and MRTG

[Graeme Fowler <graeme.fowler@xxxxxxxxxxxxxx>]

Moritz wrote:
> eth0   - main ip
> eth0:1 - second ip
> eth0:2 - third ip
>
> Now I ran cfgmaker without any obvious problems and it
> created a configuration file for all of the interfaces.
> But still, MRTG only seems to gather data for the first
> interface (eth0). Now this it not exactly what I need ;-)

That's because the SNMP stack interfaces directly with the device
statistics, and on an ethernet interface with IP aliases *all* packets must
hit the main device - in your case, eth0.

The aliases themselves do not have a counter in the kernel. Have a look at:

/sbin/ifconfig -a

You'll see the only counters are for eth0, not the two additional aliases.

In order to monitor the other two you'll probably have to use some sort of
IP accounting package. I can recommend IPFM (IP Flow Meter) since I've
written a couple of bandwidth acounting systems using it, but I've necer
used MRTG to query it. I can't see it being too tricky, though.

http://www.via.ecp.fr/~tibob/ipfm/

HTH

Graeme