Webrtc not able make connection if different router on same wan network

[pnthai88]

Question

Dear,

I have a main router at 192.168.0.1
2 other routers 192.168.0.2 and 192.168.0.3, these router have it own VLAN 192.168.1.1 and 10.0.0.1

My MediaMTX running on second router with VLAN 192.168.1.1 (192.168.0.2) and client run on VLAN 10.0.0.1 (192.168.0.3)
It's unable to make connection so my temp solution is use TURN server work perfectly.

If i move the mediamtx server to VLAN 10.0.0.1 (192.168.0.3) same with the client, it's able to make connection too.
What did i missed ?

Thanks.
BR.

[aler9]

Hello, when there are routers / NAT / firewalls between MediaMTX and clients, you have to make sure that routers are forwarding incoming requests to MediaMTX.

If you're able to establish a contact (i.e. view the web page) of MediaMTX from a client, it means that you can already reach the server through an IP and through TCP port 8889. What you are missing is the ability to reach the server from the same IP and UDP port 8189 (webrtcLocalUDPAddress).

Another required thing is that you need to insert the server external IP (192.168.0.2?) inside webrtcAdditionalHosts, because readers need to know it explicitly:

webrtcAdditionalHosts: [192.168.0.2]

No STUN or TURN servers are required, you don't need to use them unless any other method fails (mostly due to company firewalls that block all ports). For more informations, the README contains a full tutorial:

https://github.com/bluenviron/mediamtx?tab=readme-ov-file#solving-webrtc-connectivity-issues

[pnthai88]

I tried and it's work!
big thankssssssssssssssssssssssssssssssssssssssssss