Thank you Marshal, that was brilliant, this cleared my mind of a number of
questions and has made the whole NAT thing make a lot of sense.
Michael
----- Original Message -----
From: "Marshal Schoener"
To:
Sent: Monday, July 01, 2002 11:22 PM
Subject: RE: question about networks [1:9870]
> I can try :)
>
> Basically, when you are doing something like this, the Linksys is doing
what
> Cisco would call 'overloading'.
> It is really PAT... Each computer that goes out of the Linksys is given a
> different port number.
> The router (in this case the Linksys) will save the non-routable IP
address
> (192.16.x.x) and the port it went out on in an 'address translation
table'.
> After it has the info, the router will replace the computer's non-routable
> IP address with it's routable IP address. The router also replaces the
> sending computer's source port with the port number that matches where the
> router saved the sending computer's address information in the address
> translation table. This means the translation table has a mapping of the
> computer's non-routable IP address and port number along with the router's
> IP address.
> When a packet comes back into the network, the router checks the
destination
> port on the packet. It then looks in the address translation table to see
> which computer on the internal network the packet belongs to. It changes
> the destination address and destination port to the ones saved in the
> address translation table and sends it to that computer.
> Since the NAT router now has the computer's source address and source port
> saved to the address translation table, it will continue to use that same
> port number for the duration of the connection. A timer is reset each time
> the router accesses an entry in the table. If the entry is not accessed
> again before the timer expires, the entry is removed from the table.
>
> And that is really how it works :-)
>
> So, I was really not giving you the whole story when I mentioned
> encapsulation.
> Hope this helped...
> Regards,
>
> -----Original Message-----
> From: Sivaramakrishna Iyer Krishnan
> [mailto:krishnan@xxxxxxxxxxxxxxxxxxxxxx]
> Sent: Monday, July 01, 2002 2:51 PM
> To: Marshal Schoener
> Cc: associate@xxxxxxxxxxxxxx
> Subject: Re: question about networks [1:9870]
Message Posted at:
http://www.groupstudy.com/form/read.php?f=1&i=9876&t=9870
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