[vlc-devel] [PATCH] live555: fix the subtitles issue

Rémi Denis-Courmont remi at remlab.net
Mon Dec 30 14:52:43 CET 2013

Le lundi 30 décembre 2013, 14:40:30 Gilles Chanteperdrix a écrit :
> > You _cannot_ use RTSP with unicast UDP behind a NAT (unless the NAT has an
> > RTSP ALG). Period.
> No, it can be made to work. I know how, I already explained it on this list.

To traverse a NAT or a stateful firewall, you need cooperation from either the 
server (hole punching) or the NAT/firewall (ALG or port forwarding). The RTSP 
specification has no provisions for the  server sid.

So no, you cannot reliably traverse a NAT with the standardized RTSP protocol.

Rémi Denis-Courmont

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