Static IPv6 not working has expected.

[rudiservo]

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Describe the bug

Adding a static IPv6 to the Lan does not seem to work has expectedwork, no errors on log, shows in the overview and netstat, but not on the dashboard. Also setting a new ipv6 does not clear previous ipv6 on overview and netstat.

add from any fe80::/10 a /64 static address. i.e. fe88::1/64

Expected behavior

Static IPv6 address should show in overview and DHCPv6 should be able to view that ip-

Describe alternatives you considered

adding all the zeros to the IPv6 in the event it was a bug on checking ::, i.e. fe88:0:0:0:0:0:0:1

Relevant log files

DHCPv6 show this is the log

/usr/local/sbin/pluginctl: dhcpd_dhcp6_configure() found no suitable IPv6 address on lan(em1)

Opnsense 24.7.7

[rudiservo]

Upon further investigation I came to a problem, the static ipv6 address is not being properly set.

So I tested and tried to add this IPv6 fe90:1:1:1:1:1:1:1/64

but in ipconfig I get

inet6 fe90:0:1:1:1:1:1:1%em1 prefixlen 64 scopeid 0x3

plus all the tests I did on this interface with IPv6 it just added a new IPv6, it did not substitute.

Please notice that the second part is always 0 no matter what value I set, even with ipconfig i.e. ifconfig em1 inet6 fe90:1:2:3:4:5:6:7/64

My guess is the function that gets the ipv6 address does not check for "%em1", although fe80::/10 this is link local.

[fichtner]

Im unsure what your issue is in general but specifically: the second bit in the link-local is used for scoping in the kernel so you can’t use it. There is a reason why everyone uses the fe80::/64 prefix and only the suffix for addresses.

[jfieber]

If you want a locally administered address space, you will want to generate a ULA prefix and assign address out of that. Link local address are for the kernel, not the user.

https://www.unique-local-ipv6.com

[rudiservo]

@jfieber got it, thanks. Now the other issue is DHCPv6 does not work properly until I restarted the whole machine. I will close this and put up a new issue if one is not up yet-