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User who did this - Alex Hermann (axlh)

Attached to Project - sip-router Summary - DNS SRV balancing doesn't work Task Type - Bug Report Category - dns / dns cache Status - Assigned Assigned To - Andrei Pelinescu-Onciul Operating System - All Severity - High Priority - Normal Reported Version - 3.1 Due in Version - Undecided Due Date - Undecided Details - Request to a domain served by SRV records all go to the same host.

The domain is as follows: <code> _sip._udp.srv.test. 44 IN SRV 10 0 5060 172.28.4.250. _sip._udp.srv.test. 44 IN SRV 10 0 5061 172.28.4.251. _sip._udp.srv.test. 44 IN SRV 10 0 5062 172.28.4.252. _sip._udp.srv.test. 44 IN SRV 10 0 5063 172.28.4.253. </code>

Expected behavior would be that each host would receive an (approximate) equal amount of requests. in practice, one of them gets them all. The winning host changes after most restarts of kamailio, which suggests the randomization is done only once instead of for every request as is necessary.

DNS related settings: <code> dns_use_search_list=no use_dns_failover=yes dns_srv_lb=yes </code>

Results from a run of 20 (near simultaneous) calls to the above domain (format <call-number> <destination>):

<code> 1 172.28.4.251:5061 2 172.28.4.251:5061 3 172.28.4.251:5061 4 172.28.4.251:5061 5 172.28.4.251:5061 6 172.28.4.251:5061 7 172.28.4.251:5061 8 172.28.4.251:5061 9 172.28.4.251:5061 10 172.28.4.251:5061 11 172.28.4.251:5061 12 172.28.4.251:5061 13 172.28.4.251:5061 14 172.28.4.251:5061 15 172.28.4.251:5061 16 172.28.4.251:5061 17 172.28.4.251:5061 18 172.28.4.251:5061 19 172.28.4.251:5061 20 172.28.4.251:5061

1 172.28.4.250:5060 2 172.28.4.250:5060 3 172.28.4.250:5060 4 172.28.4.250:5060 5 172.28.4.250:5060 6 172.28.4.250:5060 7 172.28.4.250:5060 8 172.28.4.250:5060 9 172.28.4.250:5060 10 172.28.4.250:5060 11 172.28.4.250:5060 12 172.28.4.250:5060 13 172.28.4.250:5060 14 172.28.4.250:5060 15 172.28.4.250:5060 16 172.28.4.250:5060 17 172.28.4.250:5060 18 172.28.4.250:5060 19 172.28.4.250:5060 20 172.28.4.250:5060

1 172.28.4.253:5063 2 172.28.4.253:5063 3 172.28.4.253:5063 4 172.28.4.253:5063 5 172.28.4.253:5063 6 172.28.4.253:5063 7 172.28.4.253:5063 8 172.28.4.253:5063 9 172.28.4.253:5063 10 172.28.4.253:5063 11 172.28.4.253:5063 12 172.28.4.253:5063 13 172.28.4.253:5063 14 172.28.4.253:5063 15 172.28.4.253:5063 16 172.28.4.253:5063 17 172.28.4.253:5063 18 172.28.4.253:5063 19 172.28.4.253:5063 20 172.28.4.253:5063

1 172.28.4.252:5062 2 172.28.4.252:5062 3 172.28.4.252:5062 4 172.28.4.252:5062 5 172.28.4.252:5062 6 172.28.4.252:5062 7 172.28.4.252:5062 8 172.28.4.252:5062 9 172.28.4.252:5062 10 172.28.4.252:5062 11 172.28.4.252:5062 12 172.28.4.252:5062 13 172.28.4.252:5062 14 172.28.4.252:5062 15 172.28.4.252:5062 16 172.28.4.252:5062 17 172.28.4.252:5062 18 172.28.4.252:5062 19 172.28.4.252:5062 20 172.28.4.252:5062 </code>

More information can be found at the following URL: http://sip-router.org/tracker/index.php?do=details&task_id=120

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