[SR-Users] dns_srv_lb

[Jon Bonilla (Manwe)]

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