Hi all
I'm running a kamailio 3.1 based proxy which actually relays REGISTER requests to a domain "example.com"
I've setup a DNS SRV record for that domain which returns two hosts with same prio and weight. I want kamailio to balance the requests to both servers 50%.
Taking a look to ./doc/dns.txt I've setup these configuration options:
dns_try_ipv6=no dns_retr_time=1 dns_retr_no=1 dns_use_search_list=no use_dns_cache=on use_dns_failover=on dns_srv_lb=on
If I understood right the last setting would have to make kamailio work as I described, balancing the requests between both servers. But my logs say that kamailio is actually using only one of the ip addresses (host2.example.com) to send the REGISTER requests.
Here's the output of sercmd dns.view:
sercmd> dns.view {
name: _sip._udp.example.com type: SRV size (bytes): 232 reference counter: 1 permanent: no expires in (s): 31364 last used (s): 446 negative entry: no rr name: host1.example.com rr port: 5060 rr priority: 0 rr weight: 0 rr expires in (s): 31364 rr name: host2.example.com rr port: 5060 rr priority: 0 rr weight: 0 rr expires in (s): 31364 } {
name: host2.example.com type: A size (bytes): 128 reference counter: 1 permanent: no expires in (s): 592964 last used (s): 446 negative entry: no rr ip: 192.168.0.103 rr expires in (s): 592964 } {
name: host1.example.com type: A size (bytes): 128 reference counter: 1 permanent: no expires in (s): 592964 last used (s): 11835 negative entry: no rr ip: 192.168.0.102 rr expires in (s): 592964 }
Any suggestions? What am I doing wrong?
Thanks,
Jon
Hi Jon,
please, try to set the "weight" for both SRV records in DNS to another (but same) value than "0", e.g. "10"
The weight with "0" value has a special handling in SR, according to the RFC2782:
"Domain administrators SHOULD use Weight 0 when there isn't any server selection to do, to make the RR easier to read for humans (less noisy). In the presence of records containing weights greater than 0, records with weight 0 should have a very small chance of being selected."
Hope that helps, -Vlada B.
On 07/20/2011 09:37 PM, Jon Bonilla (Manwe) wrote:
Hi all
I'm running a kamailio 3.1 based proxy which actually relays REGISTER requests to a domain "example.com"
I've setup a DNS SRV record for that domain which returns two hosts with same prio and weight. I want kamailio to balance the requests to both servers 50%.
Taking a look to ./doc/dns.txt I've setup these configuration options:
dns_try_ipv6=no dns_retr_time=1 dns_retr_no=1 dns_use_search_list=no use_dns_cache=on use_dns_failover=on dns_srv_lb=on
If I understood right the last setting would have to make kamailio work as I described, balancing the requests between both servers. But my logs say that kamailio is actually using only one of the ip addresses (host2.example.com) to send the REGISTER requests.
Here's the output of sercmd dns.view:
sercmd> dns.view {
name: _sip._udp.example.com type: SRV size (bytes): 232 reference counter: 1 permanent: no expires in (s): 31364 last used (s): 446 negative entry: no rr name: host1.example.com rr port: 5060 rr priority: 0 rr weight: 0 rr expires in (s): 31364 rr name: host2.example.com rr port: 5060 rr priority: 0 rr weight: 0 rr expires in (s): 31364} {
name: host2.example.com type: A size (bytes): 128 reference counter: 1 permanent: no expires in (s): 592964 last used (s): 446 negative entry: no rr ip: 192.168.0.103 rr expires in (s): 592964} {
name: host1.example.com type: A size (bytes): 128 reference counter: 1 permanent: no expires in (s): 592964 last used (s): 11835 negative entry: no rr ip: 192.168.0.102 rr expires in (s): 592964}
Any suggestions? What am I doing wrong?
Thanks,
Jon
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
El Thu, 21 Jul 2011 01:25:40 +0200 Vladimir Broz vladiksip@centrum.cz escribió:
Hi Jon,
please, try to set the "weight" for both SRV records in DNS to another (but same) value than "0", e.g. "10"
The weight with "0" value has a special handling in SR, according to the RFC2782:
"Domain administrators SHOULD use Weight 0 when there isn't any server selection to do, to make the RR easier to read for humans (less noisy). In the presence of records containing weights greater than 0, records with weight 0 should have a very small chance of being selected."
Hope that helps,
It worked perfectly Vlad. Thanks a lot!
-
Jon Bonilla -
Vladimir Broz