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Home > Archive > CCNP > August 2001 > PAT Thresholds?
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| beenframed 2001-08-27, 9:41 am |
| I am running NAT on a 3640 and I have approx. 150-175 users connecting to the internet. I currently use one public address for PAT/NAT, I've been experiencing some lockdowns on my internet connectivity and can not really pin it down. The only thing that has changed is the addition of a bunch of users. Folks working over a VPN connection to our internal network coming over the same T1 as our internet connection have no problem connecting and working, the only problem they experienced as well all of the users in the office was the internet connection keeps locking up. If I reboot the router the problem is resolved temporarly. I've adjusted the NAT timeouts on Friday and have not had a problem since. Has anyone seen this before?
Thanks a septillion,
bf | |
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| I've never come across it myself, however I found the following link :
http://www.cisco.com/warp/public/cc...it/iosnt_qp.htm
Q. How many concurrent NAT sessions are supported in Cisco IOS NAT?
A. The NAT session limit is bounded by the amount of available DRAM in the router. Each NAT translation consumes about 160 bytes in DRAM. As a result, 10,000 translations (more than would generally be handled on a single router) would consume about 1.6MB. Therefore, a typical routing platform has more than enough memory to support thousands of NAT translations.
Hope it's of some use.
Mat P. | |
| beenframed 2001-08-28, 9:10 am |
| hmm, that's strange. NAT default timeout is 24 hours I entered the following commands which change it 3 hours and I have not had a problem since.
ip nat translation timeout 10300
ip nat translation tcp-timeout 10300
ip nat translation udp-timeout 10300 |
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