Re: Gen-ART LC review of draft-ietf-tram-stun-dtls-03

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Hi Roni,

See my answers below.

On 6/23/14, 7:28 AM, Roni Even wrote:
> I am the assigned Gen-ART reviewer for this draft. For background on
> Gen-ART, please see the FAQ at
> <http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.
> 
> Please resolve these comments along with any other Last Call comments you
> may receive.
> 
> Document:  draft-ietf-tram-stun-dtls-03
> 
> Reviewer: Roni Even
> 
> Review Date:2014-6-23
> 
> IETF LC End Date: 2014-6-25
> 
> IESG Telechat date: 
> 
>  
> 
> Summary: This draft is almost ready for publication as an Standard track
> RFC.
> 
>  
> 
>  
> 
> Major issues:
> 
>  
> 
> Minor issues:
> 
>  
> 
> I am not sure I understand section 4.3. When talking about "media keep-alive
> packets" is it for the STUN Binding Indication usage or for all the options
> in section 10 of RFC 5245.  

Yes, only the STUN Binding Indication usage.  You are right this is not
clear.

> Maybe you meant that you should prefer DTLS/SRTP
> keep-alive like RTP no-op in this case. I had problem understanding this
> section. Please clarify.
> 

No the text did not meant to choose one over the other, just to explain
the pros and cons of running the STUN Binding Indication usage over DTLS.

I propose this new text:

"  When STUN is being used for media keep-alive (described in Section
   10 of [RFC5245]), it runs alongside an RTP or RTCP session.  It is
   possible to send the media keep-alive packets inside a separately
   negotiated non-SRTP DTLS session if DTLS-SRTP [RFC5764] is used, but
   that would add overhead, with minimal security benefit."

Thanks.

-- 
Marc Petit-Huguenin
Developer  |  Jive Communications, Inc.
Jive.com  |  marcph@xxxxxxxxxxx

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