pfSense

I can't reproduce that here.

Before:

: cat /etc/resolv.conf 
nameserver 127.0.0.1
nameserver ::1
nameserver 198.51.100.1
nameserver 2001:db8::1
nameserver 2001:4860:4860::8844
nameserver 2001:4860:4860::8888
nameserver 8.8.8.8
nameserver 8.8.4.4

After:

: cat /etc/resolv.conf
nameserver 198.51.100.1
nameserver 2001:db8::1
nameserver 2001:4860:4860::8844
nameserver 2001:4860:4860::8888
nameserver 8.8.8.8
nameserver 8.8.4.4

It appears to be working as expected.

OK, I can also reproduce this with the DNS Forwarder. I also have a fix coming. Looks like some parenthesis around the tests involved were slightly wrong.

Applied in changeset commit:247909ff5387200fb31c76f13e7702a8fbdc06f4.

dylan mendez wrote in #note-6:

This patch seems to work, however, I had to manually re-save the config on the General Setup page for the changes to resolv.conf to push, even though it was selected to "Use Remote DNS Servers, ignore local DNS" already. Tested on 2.7.2 and 24.03-release.

That's expected, either re-save there or reboot since applying the patch wouldn't automatically regenerate the resolv.conf file, something else would have to trigger that.