Re: [magma] RE: FW: WGLC: draft-ietf-behave-multicast-06.txt

Marshall Eubanks wrote:

>>>>>
>>>>>
>>>>> In the BEHAVE draft, REQ-4, if there is a host on the inside interface
>>>>> sending UDP packets to a multicast group, the NAPT can change the
>>>> source
>>>>> address and the port but not the multicast group address. In this
>>>> way, I
>>>>> think the outside routers can not differentiate the two channels
>>>> because
>>>>> they have the same source (the public interface) and the same
>>>>> multicast
>>>>> group address.
>>>>>
>>>>
>>>> Is it possible for the NAPT to have multiple external addresses to use
>>>> as source addresses?
>>>>
>>>
>>> Why would it need this ? ASM - (*,G) : SSM (S,G) ?
>>> Or are you worried about 2 different SSM sources using the same G.
>>>
>>
>> Yes, that is the scenario Alvaro described.  Two senders using the same
>> G both behind the same NAPT.
>>
> 
> This has to be supported IMHO.
> 

But it could be supported by having an administrator inside the NAPT
assign different groups to all the SSM senders.  That way, (S,G)
collisions will not occur outside the NAPT.

I don't see an easy, automated solution.

Regards,
Brian

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