Name resolution with UDP/IPv6 broken on RELEASE?

[Aaron LI]

Interesting… I confirmed the same issue on leaf, which running master as of Aug 4.

I’ve created a bug to track this issue: https://bugs.dragonflybsd.org/issues/3294

Cheers,
Aaron 

> On Aug 13, 2021, at 11:42, YONETANI Tomokazu <y0n3t4n1 at gmail.com> wrote:
> 
> 
> Hi users,
> 
> I'm not sure when it started, but I recently noticed that name resolution stopped working on RELEASE if the DNS IP address is in IPv6
> ```
> $ drill  @2001:4860:4860::8888 aaaa leaf.dragonflybsd.org | egrep -v '^(\;|$)'
> Error: error sending query: Could not send or receive, because of network error
> ```
> unless using TCP query:
> ```
> $ drill -t @2001:4860:4860::8888 aaaa leaf.dragonflybsd.org | egrep -v '^(\;|$)'
> leaf.dragonflybsd.org. 3599 IN AAAA 2001:470:1:43b:1::68
> ```
> Similar DNS queries on other boxes running different OSes don't have the same problem, and tcpdump output shows the response from the DNS server, so I doubt it's an network issue.
> 
> $ uname -a
> DragonFly c60 6.0-RELEASE DragonFly v6.0.0.33.gc7b638-RELEASE #0: Wed Aug 4 20:25:25 JST 2021 root at c60:/usr/obj/build/usr/src/sys/X86_64_GENERIC x86_64
> 
> Cheers.
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