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RE: [AVT] Re: RTP/RTCP Port Sharing -> SCTP

Jonathan Rosenberg <jdrosen@dynamicsoft.com> Wed, 18 July 2001 16:20 UTC

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From: Jonathan Rosenberg <jdrosen@dynamicsoft.com>
To: 'Michael Thomas' <mat@cisco.com>, "Fairlie-Cuninghame, Robert" <rfairlie@nuera.com>
Cc: 'Leonid Rosenboim' <Leonid@BitBand.COM>, Ross Finlayson <finlayson@live.com>, avt@ietf.org
Subject: RE: [AVT] Re: RTP/RTCP Port Sharing -> SCTP
Date: Wed, 18 Jul 2001 12:19:13 -0400
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> -----Original Message-----
> From: Michael Thomas [mailto:mat@cisco.com]
> Sent: Wednesday, July 18, 2001 11:05 AM
> To: Fairlie-Cuninghame, Robert
> Cc: 'Leonid Rosenboim'; Ross Finlayson; avt@ietf.org
> Subject: RE: [AVT] Re: RTP/RTCP Port Sharing -> SCTP
> 
> 
> Fairlie-Cuninghame, Robert writes:
>  > 	c) only one endpoint needs to have a globally reachable 
> address for
>  > guaranteed bidirectional transport
> 
>    This seems like it defers the harder problem for about
>    10e-9s. If Valhala is gone and the ascendency NATs
>    asured, then double NAT's will be the norm.
> 
>    Then what?

Then you read draft-rosenberg-sip-entfw-02.txt, due out this week, which
explains how to handle this case.... :) The mechanism in there uses
bidirectional streams (which we call symmetric) whenever only one side its
natted, and otherwise uses a network intermediary outside of the firewall
when both are behind nats that don't support Christian's
http://search.ietf.org/internet-drafts/draft-huitema-natreq4udp-00.txt. When
contacting this network intermediary, its still useful to use symmetric RTP.

-Jonathan R.

---
Jonathan D. Rosenberg, Ph.D.                72 Eagle Rock Ave.
Chief Scientist                             First Floor
dynamicsoft                                 East Hanover, NJ 07936
jdrosen@dynamicsoft.com                     FAX:   (973) 952-5050
http://www.jdrosen.net                      PHONE: (973) 952-5000
http://www.dynamicsoft.com

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