There are 3 pools used:

   1. 1-511
   2. 512-1023
   3. 1024-65535


You can check it using 'sho nat pool' command on ASA v8.3 and above.

ciscoasa(config)# sh nat poo
UDP PAT pool outside, address 100.1.1.1, range 1-511, allocated 0
UDP PAT pool outside, address 100.1.1.1, range 512-1023, allocated 0
UDP PAT pool outside, address 100.1.1.1, range 1024-65535, allocated 4
UDP PAT pool inside, address 10.1.1.1, range 1-511, allocated 0
UDP PAT pool inside, address 10.1.1.1, range 512-1023, allocated 0
UDP PAT pool inside, address 10.1.1.1, range 1024-65535, allocated 4



The port allocation changed some time ago due to bug CSCsr28008.

Regards,
Piotr



2012/3/16 Fawad Khan <[email protected]>

> Could any find guide me to a link or explain me the following please?
>
> I am trying to find the source port numbers which an ASA uses when its
> running at NAT Overload (interface NAT) to reach to external resources. e.g.
>
> inter eth0/0
> nameif outside
> ip add 10.1.1.1 255.255.255.0
>
> inter eth0/1
> nameif inside
> ip add 10.2.2.2 255.255.255.0
>
>
> nat (inside) 1 0.0.0.0 0.0.0.0
> global(outside) 1 interface <<<< what will be the source port numbers that
> the ASA will use for this part??? I think they are random, but I want to
> know the range.
>
>
>
> Thank you.
> FNK
>
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