03-13-2007 09:24 AM - edited 02-21-2020 02:55 PM
I need to determine the average U/L and D/L data during 1 days operation of a particular IPSec VPN tunnel that is terminating on a PIX 515 (other end is Draytek Vigor). When I look at the tunnel stats using the PDM, I see the number of packets encypted/decrypted but I am assuming these packets would be of variable length, so I cant get an accurate U/L D/L figure, is this correct ?
If there is no other way to see this information, can I assume a "worst case" packet size in order to calculate this figure.
What I want to be able to achieve is to monitor the throughput and make a statement such as "500MB up 650MB down reuired in a 24 hour period (average)" etc.
The reason for this is that this tunnel is being moved to a provider that charges on total throughput (as in 1GB per week) rather than speed.
I dont have the ability to measure data requirement of individual apps and dont know the overhead that the VPN encryption adds.
03-19-2007 11:29 AM
I think Cisco works VMS module has the capability to get such information. Following link will help regarding this
http://www.cisco.com/univercd/cc/td/doc/product/rtrmgmt/cw2000/vpnmon/1_x/1_0/using/index.htm
Other option is to use some SNMP tool. MRTG is a free tool that saves historical data and can graph it, and it is quite popular.
Have a look at http://www.stat.ee.ethz.ch/mrtg/ and www.mrtg.org. Following link may help you
http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a008009496e.shtml
03-19-2007 12:49 PM
Thanks for your reply. I have got some initial figures from using access list / ip accounting stats from a router upstream from the PIX which should prove sufficient for the time being.
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