9.18 behavior change for mDNS queries with dig

[Larry Stone]

Greg, thanks. Exactly what I needed. Need to head out for a few hours but will get on this later today.

-- 
Larry Stone
lstone19 at stonejongleux.com





> On Jun 27, 2022, at 8:18 AM, Greg Choules <gregchoules+bindusers at googlemail.com> wrote:
> 
> 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