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brians at iptel.co
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 Posted: Fri Dec 10, 2021 12:12 pm Post subject: [Freeswitch-users] Weird: Cloudflare 1.1.1.1 DNS server not |
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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@guaranteedplus.com (aronp@guaranteedplus.com)> wrote:
| Quote: | 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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s.safarov at gmail.com
Guest
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| Posted: Sat Dec 11, 2021 8:48 am Post subject: [Freeswitch-users] Weird: Cloudflare 1.1.1.1 DNS server not |
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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@iptel.co (brians@iptel.co)> wrote:
| Quote: | 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@guaranteedplus.com (aronp@guaranteedplus.com)> wrote:
| Quote: | 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
_________________________________________________________________________
|
The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services.
Build your next product on our scalable cloud platform.
Join our online community to chat in real time https://signalwire.community
Professional FreeSWITCH Services
sales@freeswitch.com (sales@freeswitch.com)
https://freeswitch.com
Official FreeSWITCH Sites
https://freeswitch.com/oss
https://freeswitch.org/confluence
https://cluecon.com
FreeSWITCH-users mailing list
FreeSWITCH-users@lists.freeswitch.org (FreeSWITCH-users@lists.freeswitch.org)
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
https://freeswitch.com |
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Antony.Stone at freesw...
Guest
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| Posted: Sun Dec 12, 2021 1:49 pm Post subject: [Freeswitch-users] Weird: Cloudflare 1.1.1.1 DNS server not |
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On Saturday 11 December 2021 at 14:12:14, Sergey Safarov wrote:
| Quote: | 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.
|
That's not what the source code seems to indicate.
src/mod/endpoints/mod_sofia/sip-dig.c contains:
--------
The sip-dig utility accepts following command line options:
-p protoname
Use named transport protocol. The protoname can be either
well-known, e.g., "udp", or it can specify NAPTR service and SRV
identifier, e.g., "tls-udp/SIPS+D2U/_sips._udp.".
--udp
Use UDP transport protocol.
--tcp
Use TCP transport protocol.
--tls
Use TLS over TCP transport protocol.
--sctp
Use SCTP transport protocol.
--tls-sctp
Use TLS over SCTP transport protocol.
--no-sctp
Ignore SCTP or TLS-SCTP records in the list of default transports.
This option has no effect if transport protocols has been explicitly
listed.
-4
Query IP4 addresses (A records)
-6
Query IP6 addresses (AAAA records).
-v
Be verbatim.
--------
I do wonder whether that last comment should be "Be verbose", but I can't say
for certain :)
However, this strongly suggests that sofia_dig / sip_dig does support TCP
lookups. I have no idea whether that means it will automatically fail over to
a TCP lookup if the UDP response is "too large".
Antony.
--
Normal people think "If it ain't broke, don't fix it".
Engineers think "If it ain't broke, it doesn't have enough features yet".
Please reply to the list;
please *don't* CC me.
_________________________________________________________________________
The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services.
Build your next product on our scalable cloud platform.
Join our online community to chat in real time https://signalwire.community
Professional FreeSWITCH Services
sales@freeswitch.com
https://freeswitch.com
Official FreeSWITCH Sites
https://freeswitch.com/oss
https://freeswitch.org/confluence
https://cluecon.com
FreeSWITCH-users mailing list
FreeSWITCH-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
https://freeswitch.com |
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Antony.Stone at freesw...
Guest
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| Posted: Sun Dec 12, 2021 2:03 pm Post subject: [Freeswitch-users] Weird: Cloudflare 1.1.1.1 DNS server not |
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On Friday 10 December 2021 at 06:54:23, Podrigal, Aron wrote:
| Quote: | 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.
|
I cannot reproduce that (FreeSwitch 1.10.7 running under Debian 10 / Devuan
3):
freeswitch> sofia_dig -v @1.1.1.1 google.com
Preference Weight Transport Port Address
================================================================================
@1.1.1.1 1 1.000 udp 5060 1.1.1.1
2 1.000 tcp 5060 1.1.1.1
google.com 1 0.250 udp 5060 2a00:1450:4009:81e::200e
1 0.250 tcp 5060 2a00:1450:4009:81e::200e
1 0.250 udp 5060 142.250.187.206
1 0.250 tcp 5060 142.250.187.206
I get a result every single time.
Antony.
--
<flopsie> yes, but this is #lbw, we don't do normal
Please reply to the list;
please *don't* CC me.
_________________________________________________________________________
The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services.
Build your next product on our scalable cloud platform.
Join our online community to chat in real time https://signalwire.community
Professional FreeSWITCH Services
sales@freeswitch.com
https://freeswitch.com
Official FreeSWITCH Sites
https://freeswitch.com/oss
https://freeswitch.org/confluence
https://cluecon.com
FreeSWITCH-users mailing list
FreeSWITCH-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
https://freeswitch.com |
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avi at avimarcus.net
Guest
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| Posted: Sun Dec 12, 2021 2:04 pm Post subject: [Freeswitch-users] Weird: Cloudflare 1.1.1.1 DNS server not |
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Also FreeSWITCH Version 1.10.7-release-19-883d2cb662~64bit (-release-19-883d2cb662 64bit)On debian 9.13
`sofia_dig -v @1.1.1.1 google.com` works, with and without the -v flag.
-Avi Marcus
On Sun, Dec 12, 2021 at 8:22 PM Antony Stone <Antony.Stone@freeswitch.open.source.it (Antony.Stone@freeswitch.open.source.it)> wrote:
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s.safarov at gmail.com
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shaun at sysconfig.cloud
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brians at iptel.co
Guest
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| Posted: Mon Dec 13, 2021 1:40 pm Post subject: [Freeswitch-users] Weird: Cloudflare 1.1.1.1 DNS server not |
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In our case this definitely wasn't the issue. 1.1.1.1 just didn't respond to some queries for SRV records at all or sent back an error response. It was a geo thing too. In emea it worked fine. In Africas it didn't.
Like I said we had more things to be worrying about so we didn't spend a lot of time on it.
On Saturday, December 11, 2021, Sergey Safarov <s.safarov@gmail.com (s.safarov@gmail.com)> wrote:
| Quote: | 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@iptel.co (brians@iptel.co)> wrote:
| Quote: |
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@guaranteedplus.com (aronp@guaranteedplus.com)> wrote:
| Quote: | 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
_________________________________________________________________________
|
The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services.
Build your next product on our scalable cloud platform.
Join our online community to chat in real time https://signalwire.community
Professional FreeSWITCH Services
sales@freeswitch.com (sales@freeswitch.com)
https://freeswitch.com
Official FreeSWITCH Sites
https://freeswitch.com/oss
https://freeswitch.org/confluence
https://cluecon.com
FreeSWITCH-users mailing list
FreeSWITCH-users@lists.freeswitch.org (FreeSWITCH-users@lists.freeswitch.org)
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
https://freeswitch.com |
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