TalkTalk Full Fibre router not working FTTP (solved)

This is a little trick a lot of full fibre customers are unaware of that can be a great help when troubleshooting connection issues and need to get online..

If you are having connection issues but all the lights on the ONT are the same as usual you can bypass the router and connect a laptop or similar device (using ethernet) directly to the ONT ethernet port, its always best to try a different ethernet cable to rule that out.

Once connected you should see the lights on the ethernet port on your device flash and you should be able to get back online.

Edited by Jack_Hackett (Tue 24-Jun-25 21:12:45)

In reply to a post by Jack_Hackett:

This is a little trick a lot of full fibre customers are unaware of that can be a great help when troubleshooting connection issues and need to get online..

If you are having connection issues but all the lights on the ONT are the same as usual you can bypass the router and connect a laptop or similar device (using ethernet) directly to the ONT ethernet port, its always best to try a different ethernet cable to rule that out.

Once connected you should see the lights on the ethernet port on your device flash and you should be able to get back online.

Unless of course the fault isn’t with the router or the device you connect to it via.

Unless of course the fault isn’t with the router or the device you connect to it via.

This is not meant to be a solution for all connection problems its meant to be a simple means of gaining internet access if your new router is toast which as you can see from the forum many are, its a very common topic.

TT customers have reported a lot of trouble with the eero routers in the forum support staff will offer a replacement (not sure about this new lot) to see if it is the cause of the problem but if yours goers wrong on a Friday night its going to be at least Wednesday before you can get another.

This method allows you to bypass the router by connecting directly to the ONT which in turn allows you to get back online, its not the most convenient way of doing so but at least you have no downtime while you wait for support to send another.

Edited by Jack_Hackett (Tue 24-Jun-25 16:59:01)

In reply to a post by Jack_Hackett:

Unless of course the fault isn’t with the router or the device you connect to it via.

This is not meant to be a solution for all connection problems its meant to be a simple means of gaining internet access if your new router is toast which as you can see from the forum many are, its a very common topic.

TT customers have reported a lot of trouble with the eero routers in the forum support staff will offer a replacement (not sure about this new lot) to see if it is the cause of the problem but if yours goers wrong on a Friday night its going to be at least Wednesday before you can get another.

This method allows you to bypass the router by connecting directly to the ONT which in turn allows you to get back online, its not the most convenient way of doing so but at least you have no downtime while you wait for support to send another.

Don't forget in your scenario there is no NAT/firewall between the internet and your devices LAN port which is never good for anything other than a quick fault finding test.

Getting infected by inbound traffic is no longer an issue. Windows has had a built-in firewall since Windows XP SP2. I know university campuses where the main staff and student LANs are all on public addresses with no firewall. I frequently go to conferences where the wireless LANs are public IPv4+IPv6.

These days, the main ways devices get infected are by clicking on dodgy links, and by clicking on dodgy attachments in E-mails. In both cases, these connections are originated in the outbound direction, which almost all firewalls will permit unconditionally. Furthermore, the traffic is encrypted, so the firewall can't inspect it.

Edited by candlerb (Tue 24-Jun-25 17:30:59)

In reply to a post by candlerb:

Getting infected by inbound traffic is no longer an issue. Windows has had a built-in firewall since Windows XP SP2. I know university campuses where the main staff and student LANs are all on public addresses with no firewall. I frequently go to conferences where the wireless LANs are public IPv4+IPv6.

These days, the main ways devices get infected are by clicking on dodgy links, and by clicking on dodgy attachments in E-mails. In both cases, these connections are originated in the outbound direction, which almost all firewalls will permit unconditionally. Furthermore, the traffic is encrypted, so the firewall can't inspect it.

Very interesting, I see the ports on my firewall get regularly rattled, what are they trying to achieve with this attempted connection if they are not trying to breach?

How does this work if the authentication with your ISP is negotiated by your router?

In reply to a post by candlerb:

Getting infected by inbound traffic is no longer an issue. Windows has had a built-in firewall since Windows XP SP2. I know university campuses where the main staff and student LANs are all on public addresses with no firewall. I frequently go to conferences where the wireless LANs are public IPv4+IPv6.

These days, the main ways devices get infected are by clicking on dodgy links, and by clicking on dodgy attachments in E-mails. In both cases, these connections are originated in the outbound direction, which almost all firewalls will permit unconditionally. Furthermore, the traffic is encrypted, so the firewall can't inspect it.

Thanks for explaining that itll put peoples mind at rest.

In reply to a post by CHW_BA12:

How does this work if the authentication with your ISP is negotiated by your router?

I had a quick search and came up with -


The ONT acts as the primary connection point in fibre networks, translating high-speed optical data into a form usable by home networks. So, in a fibre optic setup, you don’t really need a traditional modem because the ONT handles everything.

In reply to a post by Jack_Hackett:

TT customers have reported a lot of trouble with the eero routers

Why didn't you say?

The best thing to do with an Eero router is to replace it with something else, take the Eero out into the car park and set it on fire.