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What is TCP timeout, and how does it relate to the NAT TCP timer?

April 26, 2017NAT relate TCP timeout timer

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What is TCP timeout, and how does it relate to the NAT TCP timer?

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A. If the three-way handshake is not completed and NAT sees a TCP packet, then NAT will start a 60-second timer. When the three-way handshake is completed, NAT uses a 24-hour timer for a NAT entry by default. If an end host sends a RESET, NAT changes the default timer from 24 hours to 60 seconds. In the case of FIN, NAT changes the default timer from 24 hours to 60 seconds when it receives FIN and FIN-ACK.