MRTG and Multihomed NIC

[Anthony Messina]

Khemera Lin wrote:
> Thanks for your response, Anthony. Yes, that is what I use. And here is the
> output:
> 
> # /usr/bin/cfgmaker --global "WorkDir: /var/www/mrtg/fw" --global "YTics[_]:
> 8" --global "Options[_]: growright,bits" --ifref=ip public at localhost
> 
> ########
> ...
> ...
> --snpo: confcache public at localhost: Ip N.N.N.1 --> 5
> --snpo: confcache public at localhost: Ip N.N.N.9 --> 5
> --snpo: confcache public at localhost: Ip N.N.N.17 --> 5
> --snpo: confcache public at localhost: Ip N.N.N.25 --> 5
> --snpo: confcache public at localhost: Ip N.N.N.33 --> 5
> ...
> ...
> ########
> 
> I have 5 different network interfaces and the fifth one is multihomed to
> have multiple IPs on it. As shown above, the cfgmaker could detect all of
> the IPs (masked with N.N.N.), but the mrtg.cfg would not have separate
> entries for those IPs; it only treats all of them as one single
> IP/interface.
> 
> Any more ideas please?
> 
> Thanks,
> Khem
> 
> -----Original Message-----
> From: fedora-list-bounces at redhat.com [mailto:fedora-list-bounces at redhat.com]
> On Behalf Of Anthony Messina
> Sent: Friday, March 03, 2006 4:29 PM
> To: For users of Fedora Core releases
> Subject: Re: MRTG and Multihomed NIC
> 
> Khemera Lin wrote:
> 
>>Hello All,
>>
>> 
>>
>>I multihome my NIC on FC4 box to have about 10 IPs. Could I set up MRTG 
>>to monitor by those IPs rather than just a single IP or NIC?
>>
>> 
>>
>>Thanks,
>>
>>Khem
>>
> 
> 
> add ifref=ip to your cfgmaker line. mrtg tries to collect info on all 
> ips it finds using snmp.  you'll need snmpd configured by using 
> /etc/snmp/snmpd.conf.

ah, i see.  i apologize, for when you initially said you "multihome," i 
assumed you were not using device aliases.  i am not certain if mrtg 
will be able to split out device alias information as i am not sure if 
the kernel tracks only by real device.

try:

~#] snmpwalk -v 2c -c public localhost|more

and find out more about your device(s) and aliases.

as an aside, why do you need so many ip addresses (from your above 
description) on the same subnet?

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