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Re: [MMUSIC] RTSP: dest_addr in the response
Mike Severa skrev:
> I am guessing the goal is for a server always to echo the dest_addr
> parameter specfied by the client, i.e., never to allow something like
>
> C - > S: ... dest_addr="192.1.2.3:4567"
>
> S - > C: ... dest_addr=":4567"
>
> Even though a SHOULD here might imply that this is legal (and as long as
> the latter were not part of a 463 error response, the implied semantics
> would be that the server processed the request and will deliver the RTP
> to the requested host).
>
> Note, C.2.2 specifies echoing for dest_attr in a way which I believe
> other text in the body of the RFC implies, however it is in the context
> of a specific use case there so its not clear how generally applicable
> that is intended to be. Is that echoing specified somewhere else that I
> missed, or is C.2.2 sufficient to disallow something like above (even if
> logic should be enough..) ?
>
I think we have several things here to consider. First of all is that
the text tries to be protocol agnostic, while it is easy to think about
RTP over UDP. Secondly, I agree that the above really shouldn't happen
unless the protocol really needs it to happen. Which isn't likely.
I suggest to add the following sentence after the SHOULD sentence:
The server MUST NOT remove address information present already in the
request when responding unless the protocol requires it.
Solves it?
Cheers
Magnus Westerlund
IETF Transport Area Director & TSVWG Chair
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Multimedia Technologies, Ericsson Research EAB/TVM
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Ericsson AB | Phone +46 8 4048287
Färögatan 6 | Fax +46 8 7575550
S-164 80 Stockholm, Sweden | mailto: magnus.westerlund at ericsson.com
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