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Logging Packet Size

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Ewan McNab

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Jan 5, 2010, 9:27:14 AM1/5/10
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Hi

We have a Cisco 1721 router that is connected to a leased line for
connecting our network to the mobile GPRS network.

Is it possible on this router to log the size of packets, by IP address,
of any data that is passed over the leased line? Ideally to send info
back to a server so can be logged in a database for later viewing.

All I'm interested in is logging the size of packet, and the remote IP
address.


Thanks

Ewan.


Doug McIntyre

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Jan 5, 2010, 11:44:20 AM1/5/10
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Sounds like you want some sort of packet accounting records. Its not going
to be too easy or reliable I'm afraid with a 1721.

The only way to get the info you want is via Netflow which I've heard
isn't always in IOS on a 1721, even if cisco FN says it is. After that,
you'll have to setup a server to collect the flow data, and
consolidate a report on what you want displayed.

It may be easier to have a sniffer box setup one steap ahead of the
router to see what is going through, and logging it there.

Something like www.ntop.org/overview.html may be of interest. (Which
can use either Netflow or sniffer records).


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