Capwap Mailing List: Re: Issue 168: DTLS and Retransmissions

[Pat Calhoun (pacalhou) (pcalhoun]

Got it - waiting for Pasi on 2.4.3.

PatC 

-----Original Message-----
From: Charles Clancy [mailto:clancy [at] ltsnet.net] 
Sent: Friday, August 01, 2008 2:38 AM
To: Pat Calhoun (pacalhou)
Cc: capwap [at] frascone.com; Pasi.Eronen [at] nokia.com
Subject: Re: [Capwap] Issue 168: DTLS and Retransmissions

Suggested text changes to address the comments:

Replace this 2.4.1 text:

    DTLS, as specified, provides its own retransmit timers with an
    exponential back-off.  However, DTLS will never terminate the
    handshake due to non-responsiveness; instead, DTLS will continue to
    increase its back-off timer period.  Hence, timing out incomplete
    DTLS handshakes is entirely the responsibility of the CAPWAP module.

with this text:

    DTLS, as specified, provides its own retransmit timers with an
    exponential back-off.  [RFC4347] does not specify how long
    retransmissions should continue.  Consequently, timing out
incomplete
    DTLS handshakes is entirely the responsibility of the CAPWAP module.

I'm not sure what needs to be addressed in 2.4.3.  Pasi -- can you be
more specific?

--
Dr. Charles Clancy                     www.ltsnet.net/~clancy
Senior Researcher, Laboratory for Telecommunications Sciences


Pat Calhoun (pacalhou) wrote:
> Pasi's comment was:
> 
>    Section 2.4.1: "DTLS will never terminate the handshake due to
>    non-responsiveness; instead, DTLS will continue to 
>    increase its back-off timer period" While RFC 4347 doesn't specify 
> how
>    long you should continue retransmitting, the 
>    intent certainly was not to continue indefinitely.
>  
>    Section 2.4.3 text about DTLS retransmissions is slightly
inaccurate;
>    DTLS handshake isn't strictly request/response, 
>    and both parties (not just the DTLS client) retransmit based on 
> timers
>    (in some situations).
> 
> It is unclear to me as to whether these are simply observations, or 
> request for change. That said, I would like either Charles or Scott to

> reply.
> 
> PatC
_________________________________________________________________
To unsubscribe or modify your subscription options, please visit:
http://lists.frascone.com/mailman/listinfo/capwap

Archives: http://lists.frascone.com/pipermail/capwap