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Message posted on ‎06 May 2024 07:33 AM

OPNsense router + FTTP without double NAT??

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

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Message posted on ‎07 May 2024 10:21 AM

Re: OPNsense router + FTTP without double NAT??

@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.

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Zen internet on FTTP (900Mbps down, 100Mbps up). SAT> IP (Apple 4K 2nd gen TV to LG C1 OLED UHD TV/Dolby Atmos Denon AVR, DacMagic Plus for Hi-Res audio), hosting own blog/forum (cluster), OPNsense & Zenarmor L4/L7 NGFW & DPI IDS/IPS, Asus ET12 Pro Tri-Band wifi, Linux, Gamer: Xbox Series X/i7 laptop, round-robin DNS over HTTPS, non-proprietary VoIP HD AMR-WB (G.722.2) and more... Beta tester Apple iOS/watchOS/tvOS/iPadOS/macOS. Dr Mae-03 PhD.

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Message posted on ‎07 May 2024 10:21 AM

Re: OPNsense router + FTTP without double NAT??

@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.

-------

Zen internet on FTTP (900Mbps down, 100Mbps up). SAT> IP (Apple 4K 2nd gen TV to LG C1 OLED UHD TV/Dolby Atmos Denon AVR, DacMagic Plus for Hi-Res audio), hosting own blog/forum (cluster), OPNsense & Zenarmor L4/L7 NGFW & DPI IDS/IPS, Asus ET12 Pro Tri-Band wifi, Linux, Gamer: Xbox Series X/i7 laptop, round-robin DNS over HTTPS, non-proprietary VoIP HD AMR-WB (G.722.2) and more... Beta tester Apple iOS/watchOS/tvOS/iPadOS/macOS. Dr Mae-03 PhD.
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Message posted on ‎07 May 2024 10:25 AM

Re: OPNsense router + FTTP without double NAT??

@oli-j 

 

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

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Zen internet on FTTP (900Mbps down, 100Mbps up). SAT> IP (Apple 4K 2nd gen TV to LG C1 OLED UHD TV/Dolby Atmos Denon AVR, DacMagic Plus for Hi-Res audio), hosting own blog/forum (cluster), OPNsense & Zenarmor L4/L7 NGFW & DPI IDS/IPS, Asus ET12 Pro Tri-Band wifi, Linux, Gamer: Xbox Series X/i7 laptop, round-robin DNS over HTTPS, non-proprietary VoIP HD AMR-WB (G.722.2) and more... Beta tester Apple iOS/watchOS/tvOS/iPadOS/macOS. Dr Mae-03 PhD.
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Message posted on ‎07 May 2024 12:01 PM

Re: OPNsense router + FTTP without double NAT??

Awesome, thanks for confirming this!

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