[Live-devel] FW packets from RTSP Client

[Ross Finlayson]

>As described in 6.1.2 of this draft of IETF:
>http://tools.ietf.org/html/draft-ietf-mmusic-rtsp-nat-03
>
>[...]
>     To allow UDP packets to arrive from the server to a client behind a
>     restricted NAT, the client must send the very first UDP packet to
>     pinch a hole in the NAT. The client, before sending a RTSP PLAY
>     request,
>[...]
>
>I wrote this patch that allows RTSPClient to receive RTP/RTCP packets
>even if they are behind a restricted NAT. I've tested in this architecture;
>
>RTSPServer <--> Public Router <--> Internet <--> Public Router <--> RTSPClient
>
>...and seems to work fine.

Thanks for the note.  At some point I hope to add more complete 
STUN/ICE functionality to the RTSP implementation (client and 
server).  In the meantime, if people want to try using your patch, 
then they they may find it useful; thanks for making it available.

A couple of things to note about your patch, however:
- Your packet data is not valid RTP or RTCP, so has the potential to 
confuse the receiving server, or at least to cause it to log invalid 
incoming data (especially for RTCP).
- You are sending your packet with TTL 0, so you're lucky it leaves 
the local machine, let alone traverses NATs.

-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/