[mrtg] Re: Network Usage based on IP??

[Pete Templin]

Are you monitoring a router or a server?  Either way, I don't think you're going to achieve your desired results.  MRTG is limited to what it can gather by SNMP, and SNMP is limited to what's available in the router.  The router doesn't handle secondary addresses separately, so all of the traffic ends up in the same counters.  Likewise, on servers, I've often found that any counters that may appear to relate to the aliased interfaces aren't reliable (and often only show one direction).

As someone said, upgrading to a subinterface-capable router and 12.2.(new_enough) to get subinterface stats is probably what you'll need.

Pete Templin
IP Network Engineer
TexLink Communications
(210) 892-4183
pete.templin at texlink.com

-----Original Message-----
From: Peter Sanchez [mailto:psanchez at nmia.com]
Sent: Thursday, March 06, 2003 11:17 AM
To: McDonald, Dan; mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: Network Usage based on IP??


Daniel,

        Thank you for your help! I originally planned to use subint's
but apparantly you cant create a subint on a LAN interface on any cisco
router under a 2620. Actually, let me correct that, I can create a
subint but can not assign it an IP address.

Would it not be possible to use the following example:

Target[ezwf]: /1.2.3.4:public at wellfleet-fddi.ethz.ch

For each individual IP aliases to eth0? Thanks again!

Peter

On Thu, Mar 06, 2003 at 06:00:28PM -0600, McDonald, Dan wrote:
>
> Three options:
> 1.  use QOS (e.g. CAR) and monitor the QOS rules
> 2.  use netflow instead of mrtg
> 3.  Re-engineer your network with vlans and create sub-interfaces, whilst
> upgrading to 12.2T for support of Dot1q subinterfaces under snmp...
>
>
> Daniel J McDonald, CCIE #2495, CNX
> Lan/Wan Integrator
> Austin Energy
> 1.512.322.6739
> dan.mcdonald at austinenergy.com
>
>
> -----Original Message-----
> From: Peter Sanchez [mailto:psanchez at nmia.com]
> Sent: Thursday, March 06, 2003 10:59 AM
> To: mrtg at list.ee.ethz.ch
> Subject: [mrtg] Network Usage based on IP??
>
>
>
> Hi all. Im in a bit of a jam. I need to know if its possible to monitor
> network usage based on the IP address and not interface. Reason being,
> ill have 5-6 different networks all on the same interface and I need to
> monitor each individual network. The router is a cisco 806 (Full IOS,
> 12.2(4)). Thanks for any help you can give!
>
> Peter
>
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