topic Re: OPNsense router + FTTP without double NAT?? in Broadband

OPNsense router + FTTP without double NAT??

oli-j — Mon, 06 May 2024 06:33:51 GMT

I have an OPNsense "router" (intel n200) and about to pull the trigger on Sky Broadband (currently with EE FTTP). Lots of long threads on this but no simple answers.

My setup plugs directly into the openreach modem/ONT and can support PPPoE and 'option 61'.

I realise I may miss out on any sky voice/VOIP service but that is fine.

Can this work without using the sky modem(e.g. some sort of modem or double NAT situation).

thanks

Re: OPNsense router + FTTP without double NAT??

mae-3 — Tue, 07 May 2024 09:21:37 GMT

@oli-j

The OPNsense firewall supports DHCP Option 61 and DHCPv6 PD and is fully compatible with Sky authentication. The authentication string for DHCP Option 61 is 'anything@skydsl|anything', and you will not have double NAT with this setup.

Re: OPNsense router + FTTP without double NAT??

mae-3 — Tue, 07 May 2024 09:25:17 GMT

@oli-j

And the OPNsense firewall plugs directly into the FTTP ONT by ethernet cable.

Re: OPNsense router + FTTP without double NAT??

oli-j — Tue, 07 May 2024 11:01:55 GMT

Awesome, thanks for confirming this!