[SR-Users] dns_srv_lb

[Vladimir Broz]

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
>
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