It's really strange, right now it's working but I don't know what has
changed.
Again I did some network sniffing on port 53 and it seems a bit random
how Blink is reacting to the DNS replies: Sometimes it simply ignores
the CNAME answer to the NAPTR and doesn't send a request for
ws1.voipgateway.org. Sometimes it sends a NAPTR request for
ws1.voipgateway.org...
IMHO the same randomness decides if everything works or fails: If it
interprets the NAPTR replies as "contains no answer", then the SRV
requests are also sent and interpreted correctly.
If the first request is mistakenly handled like a timeout, all the other
requests are not sent and the whole process seems to block somewhere.
Some timing issue in the DNS resolve threads?
Cheers
Till
On 30.11.22 15:42, [email protected] wrote:
Hi
thank you for your replies.
I'm a bit more familiar with DNS than with VOIP... If I get it right
the NAPTR is optional and SIP should work without it.
CNAME can always be a reply to a DNS lookup, it just means: The name
you are looking for is an alias, i.e. guest1.voipgateway.org is a
virtual domain. IMHO Blink does the right thing and sends a second
request for ws1.voipgateway.org.
But for ws1.voipgateway.org there's a NAPTR either. The SOA reply only
means that this an authoritative answer.
IMHO the problem comes with the second DNS reply which contains only a
SOA. Blink seams not to handle this and runs into a timeout.
Strangely enough the whole issue doesn't always appear and all works
fine sometimes. Then I get the same log lines like Timen de Mes:
2022-11-30 15:35:49.340913 [blink 2]: DNS lookup NAPTR
guest1.voipgateway.org failed: DNS response contains no answer
2022-11-30 15:35:49.405083 [blink 2]: DNS lookup SRV
_sip._udp.guest1.voipgateway.org failed: DNS record does not exist
2022-11-30 15:35:49.463001 [blink 2]: DNS lookup SRV
_sip._tcp.guest1.voipgateway.org failed: DNS record does not exist
2022-11-30 15:35:59.932458 [blink 2]: DNS lookup SRV
_sips._tcp.guest1.voipgateway.org failed: DNS record does not exist
2022-11-30 15:35:59.960770 [blink 2]: DNS lookup A
guest1.voipgateway.org succeeded, ttl=3600: 212.117.203.57
Best regards
Till
On 30.11.22 12:10, Adrian Georgescu wrote:
$dig cname guest1.voipgateway.org
;; QUESTION SECTION:
;guest1.voipgateway.org. IN CNAME
;; ANSWER SECTION:
guest1.voipgateway.org. 21600 IN CNAME ws1.voipgateway.org.
The CNAME should not be there for the domain name.
—
Adrian
On 30 Nov 2022, at 07:15, Tijmen de Mes <[email protected]> wrote:
Hi,
I looked at it a bit more and the fact that a CNAME is returned
could happen.
However in my Blink I can’t reproduce this fault, I used the domain
guest1.voipgateway.org and I could register(?), if I made a call I
got a prompt.
This is how my logs look:
1 2022-11-30 10:59:46.901093 [blink 4977]: DNS lookup NAPTR
guest1.voipgateway.org failed: DNS response contains no answer
2 2022-11-30 10:59:46.901540 [blink 4977]: DNS lookup SRV
_sips._tcp.guest1.voipgateway.org failed: DNS record does not exist
3 2022-11-30 10:59:46.901950 [blink 4977]: DNS lookup SRV
_sip._tcp.guest1.voipgateway.org failed: DNS record does not exist
4 2022-11-30 10:59:46.902359 [blink 4977]: DNS lookup SRV
_sip._udp.guest1.voipgateway.org failed: DNS record does not exist
5 2022-11-30 10:59:46.902618 [blink 4977]: DNS lookup A
guest1.voipgateway.org succeeded, ttl=2675: 212.117.203.57
I don’t have the flatpack so I can’t tell you if something is wrong
in there. The lookups are handled by python3-sipsimple.
Best regards,
Timen de Mes
—
AG Projects
Op 30 nov. 2022, om 10:35 heeft Tijmen de Mes
<[email protected]> het volgende geschreven:
Hi,
The fact that you see the timeouts could be a bug.
The problem is that a NAPTR does exist and is a CNAME? I’ve never
seen this and I am not sure this is even valid in DNS.
AFAIK a NAPTR in this case should return something like:
20 100 "s" "SIP+D2U" "" _sip._udp.sip2sip.info.
10 100 "s" "SIP+D2T" "" _sip._tcp.sip2sip.info.
25 100 "s" "SIPS+D2T" "" _sips._tcp.sip2sip.info.
After this a SRV lookup would be done.
Are you able to register your account?
Best regards,
Tijmen de Mes
—
AG Projects
Op 29 nov. 2022, om 17:44 heeft [email protected] het volgende
geschreven:
Hi there
A few days ago I updated my OS to Pop! OS / Ubuntu 22.04 LTS with
the Blink flatpack V5.5.0
A few times it worked flawlessly, but most of the time, starting a
call lags a lot and it simply fails with a beep after a few
minutes without any further message.
The logs shows issues with DNS:
2022-11-29 15:22:37.533993 [blink 2]: DNS lookup NAPTR
guest1.voipgateway.org failed: no DNS response received, the query
has timed out
2022-11-29 15:22:37.534465 [blink 2]: DNS lookup SRV
_sip._udp.guest1.voipgateway.org failed: no DNS response received,
the query has timed out
2022-11-29 15:22:37.534699 [blink 2]: DNS lookup SRV
_sip._tcp.guest1.voipgateway.org failed: no DNS response received,
the query has timed out
2022-11-29 15:22:37.534909 [blink 2]: DNS lookup SRV
_sips._tcp.guest1.voipgateway.org failed: no DNS response
received, the query has timed out
2022-11-29 15:22:37.535100 [blink 2]: DNS lookup A
guest1.voipgateway.org failed: no DNS response received, the query
has timed out
2022-11-29 15:22:37.637499 [blink 2]: DNS lookup TXT
xcap.guest1.voipgateway.org failed: DNS record does not exist
2022-11-29 15:23:08.049049 [blink 2]: DNS lookup NAPTR
guest1.voipgateway.org failed: no DNS response received, the query
has timed out
2022-11-29 15:23:08.049976 [blink 2]: DNS lookup SRV
_sips._tcp.guest1.voipgateway.org failed: no DNS response
received, the query has timed out
2022-11-29 15:23:08.050817 [blink 2]: DNS lookup SRV
_sip._tcp.guest1.voipgateway.org failed: no DNS response received,
the query has timed out
2022-11-29 15:23:08.051510 [blink 2]: DNS lookup SRV
_sip._udp.guest1.voipgateway.org failed: no DNS response received,
the query has timed out
2022-11-29 15:23:08.052161 [blink 2]: DNS lookup A
guest1.voipgateway.org failed: no DNS response received, the query
has timed out
2022-11-29 15:23:38.498519 [blink 2]: DNS lookup NAPTR
guest1.voipgateway.org failed: no DNS response received, the query
has timed out
2022-11-29 15:23:38.498998 [blink 2]: DNS lookup SRV
_sip._udp.guest1.voipgateway.org failed: no DNS response received,
the query has timed out
2022-11-29 15:23:38.499612 [blink 2]: DNS lookup SRV
_sip._tcp.guest1.voipgateway.org failed: no DNS response received,
the query has timed out
2022-11-29 15:23:38.500547 [blink 2]: DNS lookup SRV
_sips._tcp.guest1.voipgateway.org failed: no DNS response
received, the query has timed out
2022-11-29 15:23:38.501826 [blink 2]: DNS lookup A
guest1.voipgateway.org failed: no DNS response received, the query
has timed out
2022-11-29 15:24:08.946267 [blink 2]: DNS lookup NAPTR
guest1.voipgateway.org failed: no DNS response received, the query
has timed out
and so on.
But in reality there are no DNS timeouts. IMHO the issue is that
Blink doesn't handle the DNS answers right and then somehow
deadlocks on the first NATPR request.
I did some sniffing on port 53 and there are no DNS requests for SRV:
192.168.178.23 192.168.178.1 DNS 82 Standard
query 0x1eab NAPTR guest1.voipgateway.org
192.168.178.1 192.168.178.23 DNS 162 Standard
query response 0x1eab NAPTR guest1.voipgateway.org CNAME
ws1.voipgateway.org SOA ns1.backbone.ch
192.168.178.23 192.168.178.1 DNS 79 Standard
query 0x3a0b NAPTR ws1.voipgateway.org
192.168.178.1 192.168.178.23 DNS 141 Standard
query response 0x3a0b NAPTR ws1.voipgateway.org SOA ns1.backbone.ch
[ ..nothing concerning VOIP...]
192.168.178.23 192.168.178.1 DNS 82 Standard
query 0xb5c0 NAPTR guest1.voipgateway.org
192.168.178.1 192.168.178.23 DNS 162 Standard
query response 0xb5c0 NAPTR guest1.voipgateway.org CNAME
ws1.voipgateway.org SOA ns1.backbone.ch
192.168.178.23 192.168.178.1 DNS 79 Standard
query 0x5cba NAPTR ws1.voipgateway.org
192.168.178.1 192.168.178.23 DNS 141 Standard
query response 0x5cba NAPTR ws1.voipgateway.org SOA ns1.backbone.ch
[ ..nothing concerning VOIP...]
192.168.178.23 192.168.178.1 DNS 82 Standard
query 0x63b5 NAPTR guest1.voipgateway.org
192.168.178.1 192.168.178.23 DNS 162 Standard
query response 0x63b5 NAPTR guest1.voipgateway.org CNAME
ws1.voipgateway.org SOA ns1.backbone.ch
192.168.178.23 192.168.178.1 DNS 79 Standard
query 0x6dce NAPTR ws1.voipgateway.org
The queries timeout occurs because Blink does not issue the
requests. IMHO Blink does not handle the SOA replies and somehow
deadlocks, so other requests are never sent.
Instead it should simply return: NAPTR record does not exist. Go
on...
Cheers
Till
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