OPNsense Forum

Archive => 21.1 Legacy Series => Topic started by: norgan on March 23, 2021, 05:17:07 am

Title: IPv6 external DNS servers being given to clients over local DNS servers.
Post by: norgan on March 23, 2021, 05:17:07 am

OPNsense 21.1.3_3-amd64
FreeBSD 12.1-RELEASE-p14-HBSD
OpenSSL 1.1.1j 16 Feb 2021

Where do I start, I have a native dual stack link via DHCP ethernet wan (Cable modem).

Everything works, except for DNS. I have disabled unbound DNS and installed AdGaurd as that's what I was using before i got into opnsense. It works fine, but the IPv6 config wants to assign my quad 9 public DNS servers to the client which then does lookups on a public server rather than my lan local dns.

I've tried disabling it under settings for the WAN interface but still coming through.

Any ideas? I've searched a bit and can't find the cause for this particular issue.

UPDATE: I've since discovered deeper ipv6 issues and beleive this to be a downstream issue. No resolution.

Title: Re: IPv6 external DNS servers being given to clients over local DNS servers.
Post by: bartjsmit on March 23, 2021, 09:01:57 am

Services, Router Advertisements. Are you you showing a LAN entry there?

If not, set it up as unmanaged, high priority and add the LAN IPv6 address of OPNsense under DNS servers.

Give it a minute for clients to pick up the multicast and try again.

Bart...

Title: Re: IPv6 external DNS servers being given to clients over local DNS servers.
Post by: norgan on March 24, 2021, 03:25:29 am

Thanks Bart, I'll give it a shot.

Title: Re: IPv6 external DNS servers being given to clients over local DNS servers.
Post by: norgan on March 24, 2021, 03:59:52 am

Quote from: norgan on March 24, 2021, 03:25:29 am

Thanks Bart, I'll give it a shot.

LAN was already there but I had it as assisted. I've set it to unmanaged.

Title: Re: IPv6 external DNS servers being given to clients over local DNS servers.
Post by: bartjsmit on March 24, 2021, 09:32:02 am

Did the change fix your DNS issue? If so, can you edit this topic title to include [SOLVED] please?

This makes it easier for those searching the forum for similar problems.

Thanks,

Bart...