Hi, can you try the sip-dig command on that particular domain? If you set that domain in script or from a module (e.g. Dispatcher), don't set a port. According to RFC 3263, the DNS-records are treated differently, if no port is set (e.g. "redacted.hostname.here.com:5060" will produce a different result than "redacted.hostname.here.com"). I've checked the compliance of Kamailio with RFC 3263 in the past, as DNS-Failover is mandatory for IMS.
I would find it rather strange, if it should work correct in all of our deployments and not in yours. Thanks, Carsten 2017-01-20 17:47 GMT+01:00 Jeremy Gadd <jeremyg...@gmail.com>: > Thanks for the response! > > DNS lookups work in Kamailio as long as use_dns_failover is set to "off." > It's only when the failover is enabled that they break. I think this means > it's not a DNS issue, but something in Kamailio. > > I should mention we're pointing to Verizon's services with many many > thousands of customers, so it's unlikely to be misconfigured DNS (unless > it's something local that only breaks when use_dns_failover is enabled?) > > On Fri, Jan 20, 2017 at 12:37 AM, Carsten Bock <cars...@ng-voice.com> wrote: >> >> Hi, >> >> we have the following settings and those work fine for us (Kamailio 4 >> and later): >> >> # Do SRV-Loadbalancing: >> dns_srv_lb=yes >> # Always prefer IPv6: >> dns_try_ipv6=yes >> # DNS-Based failover >> use_dns_failover=yes >> # Query NAPTR-Records as well (we use NAPTR, so the client can detect >> the outbound Proxy (P-CSCF), but internally we only use only >> SRV-records) >> dns_try_naptr=no >> >> Sounds to me, like a DNS problem, not a Kamailio problem. >> >> In our DNS Zone, we have the following, for example: >> >> wt 1D IN A 84.46.93.82 >> wt 1D IN A 84.46.93.84 >> wt-1 1D IN A 84.46.93.82 >> wt-2 1D IN A 84.46.93.84 >> wt 1D IN NAPTR 10 10 "s" "SIP+D2U" "" >> _sip._udp.wt >> >> _sip._udp.wt 1D SRV 10 1 5060 wt-1 >> _sip._udp.wt 1D SRV 20 1 5060 wt-2 >> >> On Debian/Ubuntu, you can verify this with Sofia-SIP (apt-get install >> sofia-sip-bin): >> >> carsten@carsten-HP-EliteBook-840-G3:~$ sip-dig wt.ng-voice.com >> 1 1.000 udp 5060 84.46.93.82 >> 2 1.000 udp 5060 84.46.93.84 >> >> Thanks, >> Carsten >> >> >> 2017-01-19 22:58 GMT+01:00 Jeremy Gadd <jeremyg...@gmail.com>: >> > Hello, everyone! >> > >> > I'm trying to enable dns_srv_lb but I'm stuck just before I can get >> > there. >> > If I don't enable use_dns_failover, lookups work and calls route but >> > always >> > to the first host. We need to load balance, so that doesn't work very >> > well. >> > >> > If I enable use_dns_failover, the lookups stop working completely and we >> > get >> > a dns lookup failure like so: >> > ERROR: tm [ut.h:296]: uri2dst2(): ERROR: uri2dst: failed to resolve >> > "redacted.hostname.here.com" :unresolvable A or AAAA request (-7) >> > >> > This works: >> > use_dns_cache=on >> > dns_use_search_list=no >> > dns_try_naptr=on >> > # use_dns_failover=on >> > >> > This breaks it: >> > use_dns_cache=on >> > dns_use_search_list=no >> > dns_try_naptr=on >> > use_dns_failover=on >> > >> > I have checked to see that use_dns_failover is compiled in: >> > version: kamailio 4.4.2 (x86_64/linux) >> > flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, >> > DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, >> > Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, >> > FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, >> > USE_DST_BLACKLIST, HAVE_RESOLV_RES >> > ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, >> > MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB >> > poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. >> > id: unknown >> > compiled with gcc 4.9.2 >> > >> > _______________________________________________ >> > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list >> > sr-users@lists.sip-router.org >> > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users >> > >> >> >> >> -- >> Carsten Bock >> CEO (Geschäftsführer) >> >> ng-voice GmbH >> Millerntorplatz 1 >> 20359 Hamburg / Germany >> >> http://www.ng-voice.com >> mailto:cars...@ng-voice.com >> >> Office +49 40 5247593-40 >> Fax +49 40 5247593-99 >> >> Sitz der Gesellschaft: Hamburg >> Registergericht: Amtsgericht Hamburg, HRB 120189 >> Geschäftsführer: Carsten Bock >> Ust-ID: DE279344284 >> >> Hier finden Sie unsere handelsrechtlichen Pflichtangaben: >> http://www.ng-voice.com/imprint/ >> >> _______________________________________________ >> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list >> sr-users@lists.sip-router.org >> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > > > > _______________________________________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > sr-users@lists.sip-router.org > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > -- Carsten Bock CEO (Geschäftsführer) ng-voice GmbH Millerntorplatz 1 20359 Hamburg / Germany http://www.ng-voice.com mailto:cars...@ng-voice.com Office +49 40 5247593-40 Fax +49 40 5247593-99 Sitz der Gesellschaft: Hamburg Registergericht: Amtsgericht Hamburg, HRB 120189 Geschäftsführer: Carsten Bock Ust-ID: DE279344284 Hier finden Sie unsere handelsrechtlichen Pflichtangaben: http://www.ng-voice.com/imprint/ _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users@lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
