As far as I know there are different options for load-balancing. I even saw some modules for load balancing. But it is a bit tricky to get this sorted out, because many of the load-balancing options think of load balancing between several ser servers or in other words having the ser servers as target of the load balancing process.
While I am looking for a load balancing of requests to a remote sip server.
I thought that the SRV feature of the DNS system is quite old and long time established, so I expected that ser would be able to send and evaluate such a request to the DNS. There would be nothing special to do for ser, all would be done in the DNS with the same roud-robin mechanism that works for MX or A records.
You will read between the lines that I am more familiar with DNS than with ser, so I tend for this kind of solution. But it seems that I have to look into the source code of ser, to figure out in which way the dns lookup is done (or maybe I run a tcpdump on the dns port 53, to check what's happening).
Thanks anyway, Rolf.
On Tue, 22 Apr 2008, Miklos Tirpak wrote:
I think load-balancing was introduced in version 2.0, so there is no way to configure it in 0.9.x.
In 2.x, you need to enable it explicitly: dns_srv_lb=1
Regards, Miklos
On 04/18/2008 06:06 PM, Rolf Unger wrote:
Hello list users,
i want to use ser as a load balancing proxy for some PSTN gateways that I have in use. My idea is to use the rewritehost() core function and DNS SRV entries to accomplish this. But it seems that ser is doing a A record lookup if I simply replace the host with my domain "mynet.interx":
if ( ... ) { rewritehost("mynet.interx"); t_relay(); }
Ser is running on the same host (89.49.16.54) as the authorative nameserver for the mynet.interx domain.
dig shows that the DNS files are configured in the right way for load balancing, but I just can't find a way to make ser as a dns client work like dig.
If I use "_sip._udp.mynet.interx" it will complain about a bad name. Well he is partly right, underscores are not allowed in domain names.
And if I use only the domain in the rewrite command it will contact the IP of the nameserver of this domain. Or in other words it will send the messages to itself.
Using directly rewritehost("sip1.mynet.interx") doesn't help me, because it wouldn't do load balancing.
How can I convince ser (version 0.9.6) to use the correct lookup method for the DNS?
Any hints are appreciated ...
Thanks, Rolf.
; <<>> DiG 9.2.4 <<>> -t SRV _sip._udp.mynet.interx
;; QUESTION SECTION: ;_sip._udp.mynet.interx. IN SRV
;; ANSWER SECTION: _sip._udp.mynet.interx. 21600 IN SRV 0 50 5060 sip3.mynet.interx. _sip._udp.mynet.interx. 21600 IN SRV 0 50 5060 sip1.mynet.interx.
;; AUTHORITY SECTION: mynet.interx. 21600 IN NS mynet.interx.
;; ADDITIONAL SECTION: sip1.mynet.interx. 21600 IN A 89.49.16.50 sip3.mynet.interx. 21600 IN A 89.49.16.51 mynet.interx. 21600 IN A 89.49.16.54
Serusers mailing list Serusers@lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers