[Dnsmasq-discuss] "--all-servers" always on?

[John Siu]

I see. I did a rapid chain of dig in one line and see the behavior you
described. Thank you for the explanation!!


On Thu, Dec 12, 2019 at 1:16 PM Simon Kelley <simon at thekelleys.org.uk> wrote:
>
> By default, dnsmasq send a query to all the upstream servers over 50
> queries or every 20 seconds. If you're testing and doing queries slowly,
> the 20 second rule can make it look like _every_ query gets broadcast.
>
> If this is a problem, you can edit src/config.h and recompile.
>
>
> #define FORWARD_TEST 50 /* try all servers every 50 queries */
> #define FORWARD_TIME 20 /* or 20 seconds */
>
>
>
> Cheers,
>
> Simon.
>
>
> On 10/12/2019 16:41, John Siu wrote:
> > You will need "log-queries=extra" in config to see it. Then use
> > nslookup/dig to different domains.
> >
> > On Tue, Dec 10, 2019 at 11:35 AM John Siu <john.sd.siu at gmail.com> wrote:
> >>
> >> I see it doing it for every single request.
> >>
> >> On Tue, Dec 10, 2019 at 11:12 AM Simon Rettberg
> >> <simon.rettberg at rz.uni-freiburg.de> wrote:
> >>>
> >>> Am Mon, 9 Dec 2019 11:58:22 -0500
> >>> schrieb John Siu <john.sd.siu at gmail.com>:
> >>>
> >>> dnsmasq sends queries to all servers occasionally to determine which
> >>> one replies fastest, and then keeps using that one exclusively for a
> >>> while. Do you see every single query sent to all servers, or just the
> >>> first one after restarting dnsmasq?
> >>>
> >>> - Simon
> >>>
> >>>> OS: Ubuntu 18.04 with all updates
> >>>> dnsmasq version: 2.79-1
> >>>>
> >>>> According to man page:
> >>>>
> >>>> --all-servers
> >>>>     By default, when dnsmasq has more than one upstream server
> >>>> available, it will send queries to just one server. Setting this flag
> >>>> forces dnsmasq to send all queries to all available servers. The
> >>>> reply  from  the  server which  answers first will be returned to the
> >>>> original requester.
> >>>>
> >>>> I don't have that flag in command line or in the config file. However
> >>>> with "log-queries=extra" in config file, I am seeing following:
> >>>>
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 query[A]
> >>>> news.com from 10.10.10.101
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 2001:1998:f00:2::1
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 2001:1998:f00:1::1
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 2606:4700:4700::1001
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 2606:4700:4700::1111
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 2001:4860:4860::8844
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 2001:4860:4860::8888
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 209.18.47.63
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 209.18.47.62
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 209.18.47.61
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 1.0.0.1
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 1.1.1.1
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 8.8.4.4
> >>>> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> >>>> news.com to 8.8.8.8
> >>>> Dec 09 11:29:25 door dnsmasq[9403]: 3640 10.10.10.101/49351 reply
> >>>> news.com is 35.190.79.82
> >>>>
> >>>> Is --all-servers behavior changed to default on? Is there a way to
> >>>> revert it?
> >>>>
> >>>> Thank you!
> >>>>
> >>>> John Siu
> >>>
> >
> > _______________________________________________
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> > Dnsmasq-discuss at lists.thekelleys.org.uk
> > http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
> >
>
>
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