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How many concurrent NAT sessions are supported in Cisco IOS NAT?

April 26, 2017concurrent NAT sessions supported

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How many concurrent NAT sessions are supported in Cisco IOS NAT?

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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.