Re: bandwidth monitoring based on destination IP address

[Bulgaria Online - Assen Totin <assen () online bg>]

Hi,

OK> I have a customer who wants to monitor his  bandwidth based on
OK> destination IP - ideally I would have liked to use MRTG (free, easy to set
OK> up, works well), but am not sure if MRTG can pull data off a Cisco router

As far as I'm familiar with Cisco, no.

However, Cisco has a (lovely, some say) traffic summaty export
protocol called Netflow. If you enable route cache-flow on sone or all
your interfaces, you'll be able to export traffic sumamries to a given
host, then set up a listener and get the destination IPs, filetr the
ones you need and sumamrize the traffic. Netflow version 5 is easier
to deploy (than version 9), so I would recommend it. You can get the
protocol description form either the Cisco site or from here:

http://frodo.online.bg/~assen/netflow

There are GPL'ed client side implmentations lice cflowd, but it is not
difficult at all to write your own listener, say, in Perl.

WWell,

Assen Totin
Development Manager

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