28 Sep
2023
28 Sep
'23
8 p.m.
Your suggestion led me to review the DNS settings and found
`dns_cache_negative_ttl=600` which kind of matches the occasional dns
outage period. Changes the value to 0 (disabled). Will see how it goes, so
far no more errors of this kind.
Thanks again Daniel.
On Thu, Sep 28, 2023 at 1:02 PM Daniel-Constantin Mierla <miconda(a)gmail.com>
wrote:
Hello,
when this happens, can you look at the cache content and see if the
corresponding record has negative_entry set to yes? If that's the case, the
record was marked as bad (unresolvable due to a failed dns query or maybe
blocklisting activated on 503).
Cheers,
Daniel
On 28.09.23 14:48, Sergiu Pojoga via sr-users wrote:
Aloha,
I'm experiencing this internal DNS problem with Kamailio, can't seem to
figure out what's causing it. Maybe someone can help.
Essentially, from time to time (one or two times a day) this situation
happens, starting with logs:
linux kamailio[773]: ERROR: uac [uac_reg.c:1163]: uac_reg_send(): failed
to send request for [some-uuid]
linux kamailio[773]: ERROR: <core> [core/resolve.c:1730]:
sip_hostport2su(): could not resolve hostname: "my.domain.net"
linux kamailio[773]: ERROR: tm [ut.h:309]: uri2dst2(): failed to resolve "
my.domain.net"
linux kamailio[773]: ERROR: tm [uac.c:480]: t_uac_prepare(): no socket
found
# Do a Kamailio internal DNS lookup, no results found???
root@linux:~# kamcmd dns.lookup a my.domain.net
error: 400 - Not found
# Do a system DNS lookup. All good.
root@linux:~# dig my.domain.net
;; QUESTION SECTION:
;my.domain.net. IN A
;; ANSWER SECTION:
my.domain.net. 18000 IN A 192.168.0.1
# Delete internal Kamailio DNS record
root@linux:~# kamcmd dns.delete_a my.domain.net
# Lookup again right away. It's there, problem fixed. Why??
root@linux:~# kamcmd dns.lookup a my.domain.net
{
name: my.domain.net
type: A
size_bytes: 120
reference_counter: 2
permanent: no
expires: 7674
last_used: 0
negative_entry: no
records: {
{
rr_idx: 0
rr_ip: 192.168.0.1
rr_permanent: no
rr_expires: 7674
}
}
}
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