IETF Real Time Protocol Security ()

Martin Vladić | 13 Jan 2008 15:35

One "record" per datagram when the "use_srtp" extension is in effect


Hi,

I have a question for the authors of draft-ietf-avt-dtls-srtp. In
section 4.1 of this draft it states:

"When the "use_srtp" extension is in effect, implementations MUST NOT
place more than one "record" per datagram. (This is only meaningful
from the perspective of DTLS because SRTP is inherently oriented
towards one payload per packet, but is stated purely for
clarification.)"

For what reason implementations must not place more than one "record"
per datagram?

Thanks,
Martin

headers

Eric Rescorla | 13 Jan 2008 16:24

Re: One "record" per datagram when the "use_srtp" extension is in effect


At Sun, 13 Jan 2008 15:35:36 +0100,
=?ISO-8859-2?Q?Martin_Vladi=E6?= wrote:
> 
> 
> Hi,
> 
> I have a question for the authors of draft-ietf-avt-dtls-srtp. In
> section 4.1 of this draft it states:
> 
> "When the "use_srtp" extension is in effect, implementations MUST NOT
> place more than one "record" per datagram. (This is only meaningful
> from the perspective of DTLS because SRTP is inherently oriented
> towards one payload per packet, but is stated purely for
> clarification.)"
> 
> For what reason implementations must not place more than one "record"
> per datagram?

We want to preserve the one RTP packet in one RTP packet out semantics
of SRTP.

-Ekr