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24.7 Production Series / IPv6 with DHCP6 on top of PPPoE and VLAN

« on: August 06, 2024, 01:39:39 pm »

Hi, I'm kinda new to OPNSense but I think I know few things about networking So far I was using Mikrotik router but my old friend RB2011 has poor performance (+/- 150Mbps routing performance in IPv6 - probably due to lack of Fasttrack support on IPv6, IPv4 performance was OK-ish). At this point I want to give OPNSense a try and learn few thing along the way 
I'm trying to setup OPNSense as a gateway for FTTH connection from Orange in Poland. With some reading, knowledge from RouterOS setup and "sniffing around" between Livebox 6 and ONT. I try to more or less replicate ISP setup wich includes:

• VLAN id 35 on WAN interface
• PPPoE connection on top of VLAN35 interface - this gives me link-local connection (FE80::/10) between my box and ISP router.
• DHCPv6 on top of PPPoE interface to get public IPv6 prefix (/56) for my subnets and also dhcpv6.aftr-name (option-64) to use in DS-lite tunnell

And this is the point where I'm kinda stuck. My current setup looks like this: I got VLAN, I got PPPoE on it, assigned PPPoE as WAN interface, in WAN interface IPv4 configuration set to PPPoE and IPv6 configuration set to DHCPv6.
The problem is I don't recive public IPv6 prefix from DHCPv6. I turned on debug log for DHCP and it looks like DHCP6c is sending solicit messages on VLAN interface instead od PPPoE interface so there is no response.
It acts the same way whenever the "Use IPv4 connectivity" setting is set or not set.

Any ideas what is wrong with my setup?

Sidenote: PPPoE does not provide any IPv4 connectivity. It provides IPv6 Link-local and gateway adresses only.