I want to know how the icmp packet return to the source address in the internal
network after the packet be NAT or PAT, because after nat ,the icmp packet have
not information about where it come from internal network ,and the reply packet
have not information with where it want to arrive in internal network . If use
nat table , how does the NAT distinguish the reply icmp packets to different
source addresses which send the icmp request packets to the same outside adress.
thanks for all help
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