Monitor bandwidth by port on Cisco 1600

Is there a free utility out there that will monitor bandwidth usage by port or service on a Cisco router?

I am looking for a free to super cheap solution to capture traffic by port and bandwidth.  Our Sonicwall is semi-real time but the stats aren't as helpful as they could be.  I am familiar with IPTRAF for unix and am looking for sometihng similar that can hook into the Cisco.

is this even possible?
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InterWorksAsked:
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lrmooreConnect With a Mentor Commented:
I was not sure if you meant by physical port (interface) or TCP/UDP port number.
You might want to look into something like LanHound, or WildPackets network monitors. You need a packet analyzer to get the port detail that you're looking for, on the inside of the LAN. Yes, Ethereal may be a free analyzer, but it won't give you the traffic graphs like Sniffer or the other commercial packages will.

Else you can look into something like NTOP with Cisco netFlow enabled.
http://www.ntop.org

The only drawback to that is your firewall. Assuming that it is using NAT, you can't correlate the inside IP to the public ip destination from the router sitting outside the firewall.

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lrmooreCommented:
How about MRTG?
http://www.mrtg.org

How about a 30-day trial of SolarWinds orion?
http://www.solarwinds.net

Adrem Netcrunch
http://www.adrem.com
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InterWorksAuthor Commented:
I am not seeing how either of these software packages monitor traffic on the port level.  They show overall bandwidth usage per device but they do not break it down by port.  Maybe I am missing something though?
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InterWorksAuthor Commented:
That utility is awesome
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