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What happens when a TCP based packet returns to a NAT firewall ?

Question ListCategory: NetworkingWhat happens when a TCP based packet returns to a NAT firewall ?
denielshakespeare5 author asked 9 years ago
1 Answers
jamessmith05 author answered 8 years ago

When a TCP packet which exited the NAT firewall returns, the firewall looks into the

destination port in the TCP header. It would then identify the appropriate entry in the NAT

table which has the corresponding entry. After the packet is identified, the destination IP

address in the IP packet which now contains the IP address of the NAT firewall would be

re-written with the actual initiators IP address, following which the packet is sent to the

intended recipient.

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