[Solved] IPv6 Track Interface doesn't advertise subnet

[marcel]

Hi

I have an IPv6 connection with DHCPv6-PD from my ISP. IPv6 on WAN is configured with DHCPv6, Prefix delegation size and prefix hint enabled.
LAN is configured with Track Interface WAN and a prefix id.

With that configured, my LAN clients don't receive any prefix information in the router advertisements. After I run

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/var/etc/rtsold_intX_vlanY_script.shmanually, the clients receive prefix information and IPv6 works.

As a workaround I added the line into a shellscript in

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/usr/local/etc/rc.syshook.d
I run 18.1.2_2-amd64 on a APU. The issue already was in 15.7: https://forum.opnsense.org/index.php?topic=1950.msg6072#msg6072.

Is there something I can change so I don't need the workaround?

[marjohn56]

What version of opnsense are you running?

[marcel]

I run opnsense 18.1.2_2-amd64 with serial console.

[marjohn56]

Are you seeing a prefix on the Lan interface before you run the rtsold script?

[marcel]

No, I only see the IPv4 address.

[marjohn56]

Do you have directly send solicit on or off in your wan dhcp6c settings?

[marcel]

Directly send SOLICIT is turned off.

[marjohn56]

Have you tried with it turned on?

[marcel]

Thanks for the hint. With that flag enabled it grabs the IPv6 after boot without the workaround. However with this setting enabled unbound doesn't start anymore. Is this a bug?

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opnsense: /status_services.php: The command '/usr/local/sbin/unbound -c '/var/unbound/unbound.conf'' returned exit code '1', the output was '[1518296527] unbound[21470:0] error: can't bind socket: Can't assign requested address for 2001:db8::xxxx [1518296527] unbound[21470:0] fatal error: could not open ports'
I configured unbound to only listen on specific interfaces (it doesn't need to listen for dns requests on the wan interface). If I set Network Interfaces in unbound to all the service starts again.

[marjohn56]

Leave unbound to listen on all, there's often issues if you don't. pf***** also suffers from the same issues. It's not going to cause problems if it's listening on all interfaces

[marcel]

Good to know. Thanks for your help.

[marjohn56]

You're welcome, 

Mark it solved.