Like nuclear fusion, IPv6 is one of those things that feels like it's constantly about 20 years away, no matter how long we work on it.
post
replies:
Is it a subnet level address or only a single interface level address. Many ISPs, in the US at least, don't supply a block of addresses, just one. If you're only getting a single IP address or it's using 6rd (like my ISP) or similar really old, transitional technologies, then you won't be able to assign a unique GUA to your LAN (separate from the WAN address) and so you'll need additional routing configuration like NAT to properly route to locally defined IPv6 addresses.
Personally, I gave up on trying to get things to work with 6rd since NAT is way easier on IPv4 since it was never intended to be necessary on IPv6. But ISPs are just cheap, lazy, or actively trying to make self-hosting on residential plans more difficult in order to drive people to business plans and prevent businesses from using cheaper residential plans by keeping IP addresses dynamic and thus complicating DNS.
If you are getting a subnet of addresses, then ensure that configuration on the LAN side is set up properly https://docs.opnsense.org/manual/ipv6.html
replies:
shot in the dark, because I've made that mistake before, if you got dyndns setup, it needs to be from the server not the router for ipv6 to work.
replies:
Are you using a VPN? A lot of the VPN vendors disallow IPV6.
replies:
Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:
| Fewer Letters | More Letters |
|---|---|
| IP | Internet Protocol |
| NAT | Network Address Translation |
| VPN | Virtual Private Network |
[Thread #240 for this comm, first seen 17th Apr 2026, 00:10] [FAQ] [Full list] [Contact] [Source code]
replies:
Set the LAN ipv6 to track interface and it should work. You will likely also need to set a static ipv6 address on your LAN that is within the address given. SLAAC should take care of the rest.
Update : my ISP does not provide GUA.... So, whatever. Stick to IPv4 for the time being, no need to get complicated with IPv6 nat when I already have IPv4 nat working fine.
I actually have two ISP and one does support ip 6 with a GUA and that's where I got confused.... Unfortunately, it's the one providing 20mb/sec FTTC that I use only for backup. The main one, the one providing 300mb/sec over FVA does not.
replies:
all 21 comments