Re: How PAT works

its something todo with
PAT (overloading) divides the available ports per global IP address into
three ranges: 0-511, 512-1023, and 1024-65535. PAT assigns a unique source
port for each UDP or TCP session. It will attempt to assign the same port
value of the original request, but if the original source port has already
been used, it will start scanning from the beginning of the particular port
range to find the first available port and will assign it to the
conversation.

On Fri, Aug 28, 2009 at 10:42 PM, Anantha Subramanian Natarajan <
anantha.natarajan_at_gravitant.com> wrote:

> Hi All,
>
> I was going through the NAT FAQ link as pasted below to understand how PAT
> works in cisco devices.I was able to understand the explanation stated
> except the below point highlighted.What is the meaning of that ?..Kindly
> help me to understand the same.
>
>
> http://www.cisco.com/en/US/tech/tk648/tk361/technologies_q_and_a_item09186a00800e523b.shtml#qa12
>
> *"If PAT knows about the traffic type, and that traffic type has "a set of
> specific ports or ports it negotiates" that it will use, PAT sets them
> aside
> and does not allocate them as unique identifiers"*
> **
> Thanks for the help
>
> Regards
> Anantha Subramanian Natarajan
>
>
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