22 Apr
2015
22 Apr
'15
4:48 p.m.
On 21/04/15 10:40 PM, GG GG wrote:
By port closed, I mean that ports are normally closed,
but when
rtpengine send the first rtp packets to the client, it opens a pinhole
in the firewall, and the matching incoming packets from the client will
make the connection established,related in iptables. I think symmetric
nat permits that.
Yes, but rtpengine doesn't send any RTP or RTCP by itself. It only
forwards RTP and RTCP, and in order to forward it, it first must receive
it. If all ports are closed then nothing can ever be received and
nothing can ever be forwarded or sent.
Cheers