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

[Rémi Denis-Courmont]

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
http://www.remlab.net/