[Serusers] dns failover

[samuel]

It looks like SER is compiled with all compilation flags for DNS failover...
are these features set in the config file?
I guess you're using openIMS SER branch, isn't it? I don't know if it has
been sync with latest SER 2.0 and I can not assure whether ser
0.10.99-dev53-tm_fixes has SRV failover support (which I think it does
althought with maybe some bugs).

>From the dig output I guess you're trying to load balance between the two
servers responding for scscf.open-ims.test, isn't it?
Can you please attach the log file section where SER is trying to send to
this destination?

Thanks,
Samuel

2007/5/14, Mário Ferreira <mariojvp at gmail.com>:
>
> Hi,
>
> # ser -V
> version: ser 0.10.99-dev53-tm_fixes (i386/linux)
> flags: STATS: Off, USE_IPV6, USE_TCP, DISABLE_NAGLE, USE_MCAST,
> DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, DBG_QM_MALLOC,
> FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_DST_BLACKLIST
> ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16,
> MAX_URI_SIZE 1024, BUF_SIZE 65535
> poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
> @(#) $Id: main.c 136 2007-02-13 17:58:42Z vingarzan $
> main.c compiled on 22:49:24 Mar 26 2007 with gcc 3.4.6
>
> # dig NAPTR open-ims.test
>
> ; <<>> DiG 9.2.4 <<>> NAPTR open-ims.test
> ;; global options:  printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56440
> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 3
>
> ;; QUESTION SECTION:
> ;open-ims.test.                 IN      NAPTR
>
> ;; ANSWER SECTION:
> open-ims.test.          86400   IN      NAPTR   10 50 "s" "SIP+D2U" ""
> _sip._udp.open- ims.test.
> open-ims.test.          86400   IN      NAPTR   20 50 "s" "SIP+D2T" ""
> _sip._tcp.open-ims.test.
>
> ;; AUTHORITY SECTION:
> open-ims.test.          86400   IN      NS      127.0.0.1.open-ims.test .
>
> ;; ADDITIONAL SECTION:
> icscf.open-ims.test.    86400   IN      A       127.0.0.1
> _sip._udp.open-ims.test. 86400  IN      SRV     0 0 5060
> icscf.open-ims.test.
> _sip._tcp.open- ims.test. 86400  IN      SRV     0 0 5060
> icscf.open-ims.test.
>
> ;; Query time: 0 msec
> ;; SERVER: 127.0.0.1#53(127.0.0.1)
> ;; WHEN: Mon May 14 18:24:18 2007
> ;; MSG SIZE  rcvd: 259
>
> # dig _sip._udp.scscf.open-ims.test. srv
>
> ; <<>> DiG 9.2.4 <<>> _sip._udp.scscf.open-ims.test. srv
> ;; global options:  printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21445
> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 1
>
> ;; QUESTION SECTION:
> ;_sip._udp.scscf.open-ims.test. IN      SRV
>
> ;; ANSWER SECTION:
> _sip._udp.scscf.open-ims.test. 86400 IN SRV     0 1 6060
> scscf.open-ims.test.
> _sip._udp.scscf.open-ims.test. 86400 IN SRV     0 1 6061
> scscf.open-ims.test.
>
> ;; AUTHORITY SECTION:
> open-ims.test.          86400   IN      NS      127.0.0.1.open-ims.test.
>
> ;; ADDITIONAL SECTION:
> scscf.open-ims.test.    86400   IN      A       127.0.0.1
>
> ;; Query time: 0 msec
> ;; SERVER: 127.0.0.1#53(127.0.0.1)
> ;; WHEN: Mon May 14 18:26:33 2007
> ;; MSG SIZE  rcvd: 165
>
>
> regards,
>
> Mário Ferreira
>
> On 5/13/07, samuel <samu60 at gmail.com> wrote:
> >
> > I have tried DNS failover and can assert is working like charm for SER
> > version 2.0 and further.
> > Which SER version are you using?
> >
> > can you check wheter you have compiled SER with DNS failover?
> >  which is the ouput of
> >             #ser -V
> > what is the ouput of
> >             #dig NAPTR yourdomain.name.com
> > (replace yourdomain.name.com for the appropriate valie)
> >
> > regards,
> > sam.
> >
> > 2007/5/10, Mário Ferreira <mariojvp at gmail.com >:
> > >
> > > Hi,
> > >
> > > I am interested in using SER DNS failover, but I am getting some
> > > problems.
> > >
> > > A failure can be a 503 error response, ICMP errors or a timeout due to
> > > a not received response.
> > >
> > > Does anyone know if SER is able to detect these failures and then
> > > select an alternative destination for the message?
> > >
> > > If the ICMP errors can't be detected, can this be solved with timers?
> > > I turned on use_dns_cache and use_dns_failover, but when the message
> > > fails to be delivered to the first destination,
> > >  SER never tries the second destination, which was configured with DNS
> > > SRV.
> > >
> > > regards,
> > >
> > > Mário Ferreira
> > >
> > > _______________________________________________
> > > Serusers mailing list
> > > Serusers at lists.iptel.org
> > > http://lists.iptel.org/mailman/listinfo/serusers
> > >
> > >
> >
>
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