[Bug 228210] 11.2-BETA1 - DNS resolution does not work with local_unbound; cannot ping with local_unbound disabled

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228210

            Bug ID: 228210
           Summary: 11.2-BETA1 - DNS resolution does not work with
                    local_unbound; cannot ping with local_unbound disabled
           Product: Base System
           Version: 11.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: wireless at FreeBSD.org
          Reporter: doctorwhoguy at gmail.com

I've only tested this on an Acer Aspire One D255, but this was an issue with a
recent 11.1-STABLE snapshot and is still true with 11.2-BETA1. I had no
problems with 11.0 or 11.1 RELEASE on this same netbook. On a completely fresh
installation with local_unbound enabled, I am able to ping IP addresses but
cannot ping domain names. I also tried disabling local_unbound, but then I was
unable to even ping IP addresses (even on my LAN). In the case of local_unbound
being disabled, /etc/resolv.conf was being automatically generated with the
correct DNS nameserver info from DHCP, so I could not figure out why I wasn't
able to ping anything (including my router).

The only solution that has worked for me was the advice I found at
https://forums.freebsd.org/threads/unbound.60475/ which suggested that I add

module-config: iterator

to /var/unbound/unbound.conf. The networking mostly worked, with local_unbound
enabled, after that change. It was kind of flaky after that where it would work
for a while then stop until rebooting. Then after a few reboots it seemed
somewhat reliable. In any case, the line which I added was absent from the
config for 11.1-RELEASE, and it worked just fine under 11.1-RELEASE. And to the
best of my recollection, it also worked fine with local_unbound disabled under
11.1-RELEASE. So there has apparently been some kind of regression.

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