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#6353

Vadim Smirnov
Moderator

In case of NAT (or even simple forwarding) you always see each packet twice (when it arrives to the internal interface and when it is forwarded from external one) and this allows you to determine that packet was NAT’ed (only source IP/port information changes after NAT).

However, in case of proxy packet structure is not saved and doing the same looks more complex, since you have to analyze the packet content.