I lose ipv6 after a few minutes

[Greelan]

Also gotta say that it seems a little coincidental that the WAN and LAN IPv6 addresses end in the same hextet. Are they actually different?

[franco]

Is "Fordern Sie nur ein IPv6-Präfix an" (Request only an IPv6 prefix) disabled? It can really mess with delegation when unset since you can't control the addresses assigned to WAN and LAN.


Cheers,
Franco

[Hoerli]

Here are the two configurations.

WAN:


LAN:


Request only an IPv6 prefix disabled => Yes.
When I enable it, I don't get IPv6.
The LAN interface and WAN interface actually have the same IPv6 address. For whatever reason...

[Greelan]

They definitely should not have the same address. Something funky happening there

What are your RA settings for the LAN interface (Services>Router Advertisements)? Are you using DHCPv6 for the LAN?

[Hoerli]

Didn't change anything, but here is a screenshot of it.
I set it to english ;)


I have left everything possible on default to avoid such problems.
Apparently the wrong way.

[Greelan]

Try setting it to "Unmanaged", so that you can get SLAAC working at least in your network. I am assuming you have not configured DHCPv6 (which is fine if you haven't, but at a minimum you need SLAAC)

[Hoerli]

I set it to unmanaged, but the IPv6 is still lost after about 1 minute.
The LAN and WAN interface still has the same IPv6 address.

The other annoying thing I have is that most of the time when I first start and test OPNsense I only have 100Mbit/s upload and download.
The only way to fix this is to completely restart the fiber-RJ45 converter and OPNsense and then it is not guaranteed to work 100%.
I normally have a 400/160Mbits line.

[roninxt]

When I tried to delete the LAN interface (eth1), add it back and configure it with ipv6, I no longer lose ipv6 connectivity.

[Hoerli]

That's a good hint, I'll give that a try.
I have not done that yet.

[Hoerli]

I tried it once, but it didn't work.
I still lose IPv6 connectivity on the LAN after about 1-2 minutes.
I even installed the latest base kernel once (21.1.7) because before that I had installed 21.7_69 so that my Intel chipset on the motherboard would work.
While I did find that with 21.1.7 my LAN port finally worked as well, it didn't solve the IPv6 problem.

If only I knew where to look to see what the problem was.
Then I could also give better logs.
So it's a bit dumb at the moment.

[Hoerli]

Okay.
After a complete reinstallation of OPNsense now the IPv6 remains present and does not fly out after 2 minutes.
No idea what went wrong there.