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How does a NAT server forward ping ICMP echo reply packets to users?

Fresh5 days ago
Mar 15, 202650846 views
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Problem

NAT uses an IP address port number combination to hash the outgoing requests. Since ping requests consist of ICMP echo request packets, they do not have any associated port number. How does a NAT server forward the replies to the hosts inside the network?

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Fix for: How does a NAT server forward ping ICMP echo reply packets to users?

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For ICMP query/reply type messages like Echoes (pings), NAPT uses the ICMP Query ID (sometimes just called the ICMP ID) the same way it would use a TCP or UDP port number. For ICMP error messages such as Destination Unreachable, it uses the ICMP pac…

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