RE: Does Redirect/NAT change the destination port of reverse tuple ?

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On Feb 29 2008 17:30, Nishit Shah wrote:
>>>Now here original and reverse tuples are --> 
>>>	Original tuple 192.168.206.200:63423->72.14.223.83:443
>>>	Reply tuple    192.168.121.125:3128->192.168.206.200:46873
>>>
>>>So, here destination port of reverse tuple is 46873. Is it correct ?
>>
>>You could compare with the output of tcpdump to capture the
>>actual on-wire situation especially regarding port 46873.
>
>In tcpdump output I am seeing packets only with port 63423. No packets with
>port 46873. Something like
>
> 192.168.206.200:63423->72.14.223.83:443 Syn
> 72.14.223.83:443->192.168.206.200:63423 Syn Ack
> 192.168.206.200:63423->72.14.223.83:443 Ack
>
>Also, this happens with heavy load only. In normal conditions destination
>port of reverse tuple doesn't change.

Then, also check the output of `lsof -Pn` and see if it has
46873.

squid     5770 squid     20u     IPv4      30336                 TCP
192.168.206.200:46873->a.b.c.d:3128 (ESTABLISHED)
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