On 2011/08/02, at 5:21, Jan Zorz @ go6.si wrote:
> On 8/1/11 5:50 PM, Ole Troan wrote:
>>> Jan Zorz @ go6.si wrote, on 08/01/2011 10:36 AM:
>>>> Well, is short words, whatever number of ports you assign in
>>>> port-set/range, end user can exhaust them.
>>>
>>> The fact that most ISPs have been successfully operating with 65536
>>> ports per subscriber demonstrates that it is possible to statically
>>> provision subscribers with "enough" ports.
>>
>> many ISPs have deployed with much less than 64K ports. a typical
>> limitation in CPE's NAT table is just 1024 ports. I've certainly
>> returned CPEs to my ISPs with that limitation in the past.
>
> +1 :)
>
> I would do the same :)
Thanks, a clarification has made to clear a confusion of restricted port
set/ranges and NAT session table limitation. Even if a CPE is allocated 256
ports, NAT session can be made over 900G sessions in theory. ('2^32'<Full
32bits v4 address> - '2^29'<class-D/E> - '2^7'<0/8,127/8>) * 2^8<256 ports>.
cheers,
--satoru
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