HI
I put the live555MediaServer in a CENTOS computer that ip is 129.1.7.201. Then
put testRTSPClient also in a CENTOS
computer that it is behind a NAT(TP-LINK wireless router,a NAPT device) and its
ip is 192.168.1.1.
I run ./testRTSPClient rtsp://129.1.7.201/test.mpg command and the
testRTSPClient can't receive UDP packet.
live555 Server S (129.1.7.201)
|
|
|
NAPT A (WAN IP:129.1.7.100 LAN IP:192.168.1.1)
|
|
|
testRTSPClient A (192.168.0.20:4000)
I have found out the reasons of this problem:
live555 Server S (129.1.7.201)
|
^ Session 1 ^ |
| 129.1.7.201:6000 | |
v 129.1.7.100:10060 v |
|
NAPT A (WAN IP:129.1.7.100 LAN
IP:192.168.1.1)
^ Session 1 ^ |
| 129.1.7.201:6000 | |
v 192.168.0.20:4000 v |
|
testRTSPClient A
(192.168.0.20:4000)
Cient will send client RTP/RTCP port(such as 4000-4001) messge in the SETUP
request to the server. But When testRTSPClient send a UDP packet to the server
using RTP/RTCP port(4000-4001) after receiving SETUP response the NAT will
rewrite the ip and these RTP/RTCP ports to its WAN ip and ports(such as
rewriting to 10060-10061).Then server will send UDP packet to these
port(4000-4001) after receiving PLAY command.But the NAT don't know the
port(4000-4001) ,because these
port have already been rewrited to other port(10060-10061).So the
testRTSPClient can't receive UDP packet.
Is it right that the server should send UDP packet to the port(10060-10061)
what have been rewrited to after receiving PLAY command?
2013-10-10
kingaceck
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