[SR-Users] NAPTR priorities doesn't seem to work properly

[Klaus Darilion]

My Kamailio 3.1.3 performs NATPR lookups:

use_dns_cache = yes
dns_try_naptr = yes
dns_udp_pref=1
dns_tcp_pref=1
dns_tls_pref=1
dns_sctp_pref=1

dns_use_search_list=no
dns_try_ipv6=yes
dns_retr_time=1
dns_retr_no=1


regards
Klaus


Am 09.06.2011 12:44, schrieb Iñaki Baz Castillo:
> Hi, I'm testing Kamailio's NAPTR resolution:
> 
> version: kamailio 3.2.0-dev4 (x86_64/linux)
> flags: STATS: Off, USE_IPV6, USE_TCP, USE_TLS, TLS_HOOKS,
> USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM,
> SHM_MMAP, PKG_MALLOC, DBG_QM_MALLOC, USE_FUTEX,
> FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR,
> USE_DST_BLACKLIST, HAVE_RESOLV_RES
> ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16,
> MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 4MB
> 
> 
> DNS related configuration:
> 
> dns_servers_no=2
> dns_srv_lb=yes
> dns_try_naptr=yes
> dns_use_search_list=no
> use_dns_cache=yes
> use_dns_failover=yes
> dns_tls_preference=1
> dns_tcp_preference=1
> dns_udp_preference=1
> 
> 
> As the doc says it should respect the priorities of the NAPTR records,
> see http://kamailio.org/dokuwiki/doku.php/core-cookbook:3.1.x#dns_sctp_pref_dns_tcp_pref_dns_tls_pref_dns_udp_pref:
> 
>   "To use the remote site preferences set all dns_*_pref to the same
> positive value
>     (e.g. dns_udp_pref=1, dns_tcp_pref=1, dns_tls_pref=1, dns_sctp_pref=1)"
> 
> 
> So my kamailio receives an INVITE for an external domain oversip.net
> (no transport param neither port in the RURI) and does a t_relay.
> Request RURI is sip:qwe at oversip.net.
> 
> According to NAPTR:
> 
>   ~$ host -t naptr oversip.net
>   oversip.net has NAPTR record 5 50 "S" "SIPS+D2T" "" _sips._tcp.oversip.net.
>   oversip.net has NAPTR record 10 50 "S" "SIP+D2T" "" _sip._tcp.oversip.net.
>   oversip.net has NAPTR record 20 50 "S" "SIP+D2U" "" _sip._udp.oversip.net.
>   oversip.net has NAPTR record 40 50 "S" "SIP+D2S" "" _sip._sctp.oversip.net.
>   oversip.net has NAPTR record 50 50 "S" "SIPS+D2S" "" _sips._sctp.oversip.net.
> 
> So it should try TLS over TCP first, if it fails try TCP and if it
> fails try UDP.
> 
> 
> However it just uses UDP, why??
> Even if I set a minor value to dns_tls_preference (so higher priority
> I expect) it still uses UDP.
> 
> Am I doing something wrong? Thanks a lot.
> 
>