Bridge mode with Static IP: OPNsense

[Epoch101]

Hi everyone,

I’m trying to set up my OPNsense router with Airtel Broadband and need some help.

I have a Nokia G-2425G-A ONT and have read that PPPoE isn’t required for a static IP. I’ve configured my IP, subnet mask, and gateway as specified here. For now, I’m using IPv4 since it’s easier to configure.

I’ve set Port 4 on the ONT to Bridge mode and enabled VLAN 100 tagging on the WAN port in OPNsense.

After this setup, the internet works for about 20-30 seconds before it stops completely.

Is there any configuration I might be missing, either on the ONT or in OPNsense, that could resolve this issue?

I’ve tried looking online but couldn’t find anyone with a similar problem where the connection works briefly and then stops.

Thanks in advance for your help!

 

[tr1k0N4]

Did you try checking on your PC if the same issue is encountered there as well?

 

[Epoch101]

Yes, I tried the same with my PC. The same thing happens.

I was wondering if this was happening because of some existing port forwarding settings on the ONT?

Would changing all ports to Bridged fix the issue?

 

[tr1k0N4]

I don't think it has anything to do with port forwarding or anything, but maybe try removing the port forwarding settings and check.
Also, try changing some other port to bridge and observe what happens.

 

[Soumil]

Have you removed the static IP profile from the GPON?

 

[Epoch101]

@tr1k0N4 I tried all 4 ports on my PC, and I'm getting the same behavior. The internet works for about 30s and then dies. I have also deleted the port forwarding rules, but I'm having the same issue.

@Soumil the option to delete the static IP profile on my GPON is greyed out on the page, so I am unable to delete it.

 

[tr1k0N4]

That behaviour is unprecedented, brdr @Epoch101
Maybe the router is faulty or something

 

[Epoch101]

Ah okay, that's unfortunate. I'll have to request airtel for another router later ig. Thank you for the support!

 

[Soumil]

@Epoch101 That explains why your internet seems to "work" for some time then dies. Your router and the ONT are competing in ARP replies for the same IP address. In short, Airtel's gateway gets confused regarding which MAC address to send the traffic to.

 

[Epoch101]

@Soumil do know if resetting the ONT would fix it?