Limitaion of nat translations

[s.lachica]

Hi all,

What is the limitation of nat in 2921 or in ios routers in general?

Thanks,

Son

[Mark Malone]

Hi it varies on platform but here is the rules below

http://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/26704-nat-faq-00.html

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 312 bytes in DRAM. As a result, 10,000 translations (more than would generally be handled on a single router) consume about 3 MB. Therefore, typical routing hardware has more than enough memory to support thousands of NAT translations