[mrtg] Re: monitoring individual ip addresses in mrtg

[tony bourke]

Hi Ross,

Unfortunately, what you're trying to do probably isn't possible with MRTG
(actually, it's SNMP).

SNMP and (and the networking stacks SNMP grabs the data from) keep track
of octet/byte counters via Layer 2 interface, and not Layer 3 IP
addresses.  This is part of the MIB-II (RFC 1213) specification.

There are a few vendors that have their own enteprise MIBs that do check 
bandwidth on an IP basis in special circumstance (such as F5's BIG-IP), 
but I don't think Cisco adds what you're trying to do.

Tony


On Tue, 25 Jun 2002, Ross Tsolakidis wrote:

> Hi all,
> 
> I appreciate all the advice everyone has given me.
> I have another question ;)
> 
> We have some clients who have boxes in our network, I'm monitoring the
> individual interfaces on their boxes and using the MRTG Total Traffic
> Generator app I get the totals of their usage.
> 
> But one particular client has multiple boxes in our DMZ which means when
> they do transfers between their boxes it also shows up in the total traffic
> and also shows in the MRTG graph for both machines.  To get an accurate
> total I would need to get figures from the routers, the information form the
> routers would then be an accurate total of their usage.
> I'm currently monitoring our external interfaces on all routers, is there a
> way to get MRTG to monitor the external interface on the router breaking
> down the traffic to each individual IP address ?
> 
> I hope I haven't confused you guys ;)
> 
> Basically I need MRTG to graph the traffic on the external interface of the
> router per IP address ...   Does that make sense ?
> 
> Cheers,
> 
> Ross.
> 
> 
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