9.18 behavior change for mDNS queries with dig

[Greg Choules]

Hi Larry.
sudo tcpdump -ni any -c 1000 -w <filename>.pcap port 5353

For <filename> I usually include the date, hostname and some other
meaningful stuff to help you remember what it was for in 6 months' time.
Whilst this is running, make some queries in another terminal window.

I hope this helps.
Cheers, Greg

On Mon, 27 Jun 2022 at 14:11, Larry Stone <lstone19 at stonejongleux.com>
wrote:

> Petr, you are going to have to tell me how to create an appropriate PCAP
> file. As most of this stuff works so well these days, it’s been years since
> I had to do any sort of packet level analysis (moved on to other things
> professionally) and what I knew of how to do that has long since been lost.
> My issue is on a small home network so very little goes wrong. The
> appropriate tcpdump command to get what is needed should be all I need.
>
> --
> Larry Stone
> lstone19 at stonejongleux.com
>
>
>
>
>
> > On Jun 27, 2022, at 1:48 AM, Petr Špaček <pspacek at isc.org> wrote:
> >
> > On 27. 06. 22 8:26, Evan Hunt wrote:
> >> On Sun, Jun 26, 2022 at 10:00:08PM -0500, Larry Stone wrote:
> >>> I recently moved from 9.16 to 9.18 and just noticed that dig no longer
> >>> resolves mDNS queries.
> >>>
> >>> With 9.16:
> >>> dig +short @224.0.0.251 -p 5353 hostname.local
> >>> 192.168.0.82
> >>>
> >>> With 9.18:
> >>> dig +short @224.0.0.251 -p 5353 hostname.local
> >>> ;; connection timed out; no servers could be reached
> >>>
> >>> I can’t find anything in the Release Notes (or anyplace else) about
> this.
> >> "dig" was rewritten in 9.18 to use the libuv-based network manager
> >> instead of the old socket code; it's probably related to that. Please
> >> open a bug report at https://gitlab.isc.org/isc-projects/bind9/-/issues
> ,
> >> we'll look into it.
> >
> > Please don't forget to attach PCAP file produced by tcpdump or similar
> tool so we can see if anything happens on the wire or not.
> >
> > --
> > Petr Špaček
>
> --
> Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe
> from this list
>
> ISC funds the development of this software with paid support
> subscriptions. Contact us at https://www.isc.org/contact/ for more
> information.
>
>
> bind-users mailing list
> bind-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/bind-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.isc.org/pipermail/bind-users/attachments/20220627/dc32eb8e/attachment.htm>