Re: AD review comments for draft-ietf-syslog-dtls

Hi Folks,

I'll suggest CCID 3 because that's my lucky number.  ;-)

Seriously, here is a relevant point from RFC 5238:
===vvv===
    In addition to the retransmission issues, if the throughput needs of
    the actual application data differ from the needs of the DTLS
    handshake, it is possible that the handshake transference could leave
    the DCCP congestion control in a state that is not immediately
    suitable for the application data that will follow.  For example,
    DCCP Congestion Control Identifier (CCID) 2 ([RFC4341]) congestion
    control uses an Additive Increase Multiplicative Decrease (AIMD)
    algorithm similar to TCP congestion control.  If it is used, then it
    is possible that transference of a large handshake could cause a
    multiplicative decrease that would not have happened with the
    application data.  The application might then be throttled while
    waiting for additive increase to return throughput to acceptable
    levels.

    Applications where this might be a problem should consider using DCCP
    CCID 3 ([RFC4342]).  CCID 3 implements TCP-Friendly Rate Control
    (TFRC, [RFC3448])).  TFRC varies the allowed throughput more slowly
    than AIMD and might avoid the discontinuities possible with CCID 2.
===^^^===

My reasoning for choosing CCID 3 is that when some devices start up they 
will queue up syslog messages until the network is up, and then they will 
start to deliver them.  I don't want a large handshake to throttle that 
initial burst of messages.  (Please challenge this assumption if you have 
a better understanding of the process.)

I'll suggest that the specific wording will need to be: "MUST implement 
CCID 3 and SHOULD implement CCID 2 to ensure interoperability".  Does that 
sound OK to everyone?


Joe: can you look at Sean's second question and let us know about that?

Thanks,
Chris

On Thu, 8 Apr 2010, Sean Turner wrote:

> I have one major comment and it relates to DCCP:
>
> The DCCP chairs tell me that to specify the use of DCCP the ID needs to 
> decide which CCID it will use (CCID 2 is AIMD and CCID 3 is TFRC).  I was 
> hoping that the DTLS over DCCP RFC addressed this, but that RFC doesn't pick 
> one it leaves this choice to the "application".
>
> Can you also confirm that the Port # is used as the DCCP service code?
>
> spt
>
>
>
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