Internet and IPTV over One Network with PPPoE Passthrough on the F@st 5670

[plopnl]

Want Internet + IPTV over a single OpenWRT router behind the F@st 5670 — without running extra cables to media boxes? Here's a working dual-WAN passthrough setup using IGMP proxy and OpenWRT bridging.

What You’ll Need

• F@st 5670 modem with PPPoE passthrough mode
• OpenWRT router with 2 WAN ports (e.g. GL.iNet Flint 3)
• IGMP snooping + IGMPproxy installed on OpenWRT

Background
When you enable PPPoE passthrough mode, one of the LAN ports on the F@st 5670 modem will handle the PPPoE session for internet access and the other three will do IPTV. The technicians and helpdesk will tell you that you need to run separate cables from one of those three ports to the media boxes to get them to work. As that was something I didn’t want to do — but I did want to run my own router — I started looking for a solution and found one.

What we are going to set up

Router Setup
You need a router with 2 WAN ports running OpenWRT. If your OpenWRT router has only one WAN port, you’ll need to convert one of the LAN ports into a WAN port. In my case, I used a GL.iNet Flint 3, which has 2 WAN ports by default.

Pre-Setup: Make IPTV Work Behind Your Router

1. Disconnect the main WAN port so it doesn’t interfere.
2. Connect the WAN2 port to the modem (I used LAN 4 on the modem).
3. Set it to DHCP mode.
4. Reserve the IP for that port in the F@st DHCP server (just to be sure).
5. Set those IP settings as static on the OpenWRT router.

Install Required Packages
Open a shell, to start a SSH session to OpenWRT and run:
ssh root@192.168.8.1
opkg update
opkg install igmpproxy kmod-qca-mcs
Enable IGMP snooping from the Flint web interface.

Check Network Config
Install nano on OpenWRT to edit the network config file.
opkg install nano
nano /etc/config/network
Look for igmp_snooping and make sure it is set to 1 on:

• device br_lan
• interface lan
• interface guest (if used)

Fix IGMPproxy Settings
If your TV freezes after 4–5 seconds, update the IGMPproxy config:
nano /etc/config/igmpproxy
Look for something like:
option altnet '192.168.1.0/24'
Change it to:
option altnet '10.1.144.0/24'
Restart the proxy and network:
/etc/init.d/igmpproxy restart
/etc/init.d/network restart
If your TV still doesn’t start playing, look for:
option network 'wan'
Change it to:
option network 'secondwan'
(Note: The name of the second WAN interface may differ depending on your router model.)

Set Up PPPoE Passthrough

1. Disconnect the WAN2 port.
2. Connect the WAN port to the modem (I used LAN 1 on the modem).
3. Go to your F@st modem web interface:

• Copy the PPPoE username and password and store them safely.
• Remove everything from the username and password boxes.
• Press Apply.
• Enable PPPoE passthrough and press Apply again.

1. In the Flint web interface:

• Set the WAN port to PPPoE.
• Enter the username and password.
• No need to set anything else — OpenWRT will figure it out.

Your router should now connect and serve the home.

Putting It Together
Connect both WAN ports to the modem:

• WAN → LAN1 on the modem
• WAN2 → LAN4 on the modem

If the TV's stop working and you had to change 'wan' to 'secondwan' in the igmpproxy config file, change it back to wan and restart the proxy

Summary

• WAN serves Internet via the bridge to LAN/WiFi.
• WAN2 serves IPTV via the same bridge to LAN/WiFi.
• OpenWRT bridges everything together into one network — no need for extra cables.