Help me setup my BSNL Modem in bridge mode.

So BSNL gave me H640V-G25E ONT Modem with FTTH. Its IP range is 192.168.1.xx. Also, I got an iBall router whose IP range is 192.168.1.xx. As you can see, they are double natted. I would really, really like to have my wifi router as the main device for ddns and port forwarding stuff.

I found somewhere that 3rd and 4th LAN ports are for PPPoE. But I cannot establish a PPPoE connection from my PC from these ports. Do I need to change something from the modem for it to work?

Please help me out!

Ok, so I figured it out myself. I will start with PPPoE. To establish a successful PPPoE connection from PC, I first changed my WAN mode in modem from PPPoE to DHCP. This disabled PPPoE from the modem. Then I connected my pc to the modem on the 3rd port and established a successful PPPoE from my PC (from network and sharing centre > new dial-up connection). Now I knew my PPPoE settings work.

Now I connected the cable from the modem to router to configure it for PPPoE. I went to my router's WAN settings and put my details there. I then connected my router's WAN to the modem's 3rd port. And behold, now my router is the main device and all the features such as DDNS, port forwarding, etc works perfectly.

Another minor issue this creates is the constant blinking of LAN led on the modem. For this, I connected my PC to port 1 of the modem. And then changed my modem's WAN settings again from DHCP to static IP. I assigned a random IP (here 192.168.2.5) from my router's subnet pool and filled all details. (gateway being my router's IP address). In the previous post, I made a mistake that my routers IP address range is 192.168.1.xx, which actually was 192.168.2.xx.

I probably think that the static IP that I provided to my modem doesn't actually affect it and my modem and my router are just connected for PPPoE only. There might be unknown harmless side effects which I am currently unaware of but then again, the blinking stopped which was irritating and the setup is working perfectly fine.

Currently, I am unable to access my modem from my router subnet. It may be because port 3 is hardwired for PPoE only and not for routing. I will put my advances here if any.

What did you do about the MAC address? Did you clone the modem's MAC address on the router?

Nope, not necessary in my case. But if it doesn't work out in your case, try cloning it.

Can you help me with the details you entered in the wan settings of your router? Also, I am trying to bridge the pppoe of a ont modem to a dsl-2750u router.

@paper2d Have you been able to use the voice (landline) service after your new configuration? If so, how? Are you using it with Rj11 port of the ONT modem or have you configured Sip?

Yes, I have used the rj11 port and configured sip. But, landline is not important for me. I only picked up the phone for cleaning. I barely use it. The modem is Optronix rl821gwv and the router is D-Link DSL - 2750U(Hardware version i1).

Thanks @Senkottuvelan . But landline is important for me. Besides, @paper2d has the same ONT as me. So it is very useful for me to if and how he may configured is voice through SIP.

So, @paper2d, please let me know your configuration.

@Audioctor do u want to forward your voice config to the router or are you fine with the landline connected to the ONT?

Hello. I want the voice configured on my IPPBX connected to my LAN.
Besides, I just changed my modem to Syrotech.
Here are the images of my configuration.
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Damn! This forum never informed me about new replies. About voice, I never configured anything in my modem because there isn't any setting for it in the configuration page of the modem. It just continued working. In your case of the Syrotech modem, it should work too as you are just disabling the DHCP server and PPPoE ( ¯\(ツ)/¯ ). Tinker around until you can find something.