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

[Roman Shpount <[e-mail]>]

Hi Christer,

On Wed, Feb 10, 2016 at 5:29 AM, Christer Holmberg <
[e-mail]> wrote:

> Hi Roman,
>
> > 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.
_____________
Roman Shpount