Re: [MMUSIC] DTLS-over-SCTP, anyone?

[Christer Holmberg <[e-mail]>]

Hi,

>>> I think we can add the following to section 7.1 of dtls-sdp:
>>>
>>> If DTLS is transmitted over a reliable transport and if DTLS procedures for retransmissions are not used, for instance as described in
>>> RFC 6083 for DTLS over SCTP, then DTLS association MUST NOT span across multiple transports. Using 'dtls-connection' attribute with
>>> an 'existing' value in combination with change of such a reliable transport should be treated as an error and DTLS association MUST be
>>> terminated.
>>
>> Your text as such looks ok. But, do we really want to add it as a generic restriction in draft-dtls-sdp? Shouldn't it be
>> specific for DTLS-over-SCTP instead? What if someone defines DTLS-over-<new-fancy-reliable-transport> and they DO allow span?
>
> The reason multiple DTLS associations cannot span across several SCTP association is due to SCTP association handling DTLS packet 
> retransmission and DTLS procedures for retransmissions not being used. We can make a generic statement or limit this to RFC 6083 
> only, but I think, stating the reason why DTLS association cannot span multiple transports is important.

I agree.

But, again DTLS-over-SCTP is described in draft-sctp-sdp, so I think such text belongs there.

Regards,

Christer



_____________
Roman Shpount