[mrtg] monitoring individual ip addresses in mrtg

[Ross Tsolakidis]

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.

[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

Post by Ross Tsolakidis
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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