[Freeswitch-users] Weird: Cloudflare 1.1.1.1 DNS server not working with sofia_dig

[Sergey Safarov]

You can check DNS response.
I think there may be a set flag that indicates "partial response."
In this case, the client should switch transport used to send requests from
UDP to TCP.

As I know Freewithch (libsofia) do not support DNS request via TCP and this
lead to failed DNS lookup.


On Fri, Dec 10, 2021 at 8:10 PM Brian : <brians at iptel.co> wrote:

> We noticed something similar with 1.1.1.1 and srv records a while ago.
> Didn't spend much time on it just told customer to use a resolver that
> works.
>
> On Friday, December 10, 2021, Podrigal, Aron <aronp at guaranteedplus.com>
> wrote:
> > Hi,
> > I am experiencing weird behavior.
> > I have my nameserver set to 1.1.1.1, doing sofia_dig returns no results,
> one request out of five succeeds.
> > - When I do a dig / host lookup directly outside freeswitch using
> 1.1.1.1, it works.
> > - sofia_dig with any other DNS server (8.8.8.8, 9.9.9.9 etc) works.
> > PCAP shows DNS traffic being sent and received normally. In the non
> working scenario, the response from 1.1.1.1 simply has zero  ips.
> > See below.
> >
> >
> </mail/u/0/s/?view=att&th=17da4c1a164bfbe4&attid=0.0.1&disp=emb&realattid=ii_kwzyxhsx1&zw&atsh=1>
> >
> > --
> >
> > -
> > Aron Podrigal
> >
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