While ICMP doesn't have ports, the payload is used to identify packets,
thus simulating a "port".
Does this answer your question?
regards,
mouss
At 12:01 27/02/01 +0800, [EMAIL PROTECTED] wrote:
>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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