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#5607

Vadim Smirnov
Moderator

IMHO, in theory (hardly likely that it will ever happen in real life) it is possible that application running on NAT system access the same IP/port as another application running behind the NAT and the same source port used in NAT table and for local application running on NAT system. In this case it is not possible to distinguish if packet should be NAT’ed or not. But even in this rare case you still can use sequence and aknowledgement fields in TCP header to determine wheather the NAT should be applied (it will work for TCP connection only).