Hello,

does it happen for both UDP and TCP? Or only for TCP is the private interface used? Normally should work no matter the transport, try to force only ip with force_send_sock("x.y.z.w").

I assume that the IP routing rules allow traffic from private IP to public addresses.

Cheers,

Daniel

On Fri, Jun 21, 2019 at 5:49 PM Karsten Horsmann <khorsmann@gmail.com> wrote:

Hi List,

after reading the corebook in the wiki and some issue reports (1), I think it's not possible to force the outgoing ip for uac.so registration.

I saw traffic with 

172.20.120.53:45689 - - - > reg.sip-trunk.telekom.de

So that's random highport generated traffic tcp traffic on the first interface ip. 

AFAIK this behavior could not change, right?

(1)

https://github.com/kamailio/kamailio/issues/1532

Karsten Horsmann <khorsmann@gmail.com> schrieb am Fr., 21. Juni 2019, 11:44:

Hi List,

I try to register to Deutsche Telekom and there product Deutschland Lan siptrunk.

Thats works find but i see an intressting behaviour on selecting the right outgoing interface.
Kamailio is sending out with tcp the REQUEST via first private ip configured on that server (172.20.120.53).
There is no listen directive for that.

I forced NAPTR to use tcp or udp and i assume that kamailio got the right dns answers.

On the list i read also that i can use force_send_socket to force the outgoing request.

Now my idea - hey i use the $rP for the outgoing to select the right outgoing listen directive.
$rP - reference to transport protocol of R-URI
But to my surprise the logfile told me thats "UDP" - it sends out via TCP (thats okay).

Whats an good transport selector variable from kamailio that works?


event_route[tm:local-request] {
  if(!is_method("OPTIONS")) {
        xlog("L_INFO", "[tm:local-request] request [$rm] from [$fu] to [$ru] [$rP]\n");
  }
}

INFO: <script>: [tm:local-request] request [REGISTER] from [sip:+49XXXXXXXX@sip-trunk.telekom.de] to [sip:sip-trunk.telekom.de] [UDP]


listen=tcp:2xx.xx.xx.xx:5060
listen=udp:2xx.xx.xx.xx:5060
listen=tls:2xx.xx.xx.xx:5061 advertise CFG_EXT_NAME:5061


listen=udp:172.20.120.55:5060
listen=udp:172.20.120.56:5060
listen=udp:172.20.120.57:5060
listen=udp:172.20.120.58:5060
listen=tcp:172.20.120.58:5060


use_dns_cache=on # use internal DNS cache
use_dns_failover=on # depends on internal DNS cache
dns_srv_loadbalancing=on
dns_try_naptr=on
dns_retr_time=1 # seconds before retrying a DNS request
dns_retr_no=3 # number of DNS retransmissions
dns_naptr_ignore_rfc=yes # ignore target NAPTR priority
dns_tcp_pref=30 # TCP has second-highest priority
dns_udp_pref=10 # use UDP with least priority
tcp_connection_lifetime=3605 # set higher than registration expires

#dont' restore
modparam("uac","restore_mode","none")
modparam("uac","restore_dlg",0)

## UAC REGISTER
#!ifdef WITH_UAC_REGISTER
modparam("uac", "reg_contact_addr", "CFG_PROD_IP")
modparam("uac", "reg_timer_interval", 10)
modparam("uac", "reg_retry_interval", 10)
modparam("uac", "reg_db_url", DBURL)
modparam("uac", "restore_mode", "none")
modparam("uac", "auth_username_avp", "$avp(AVP_AUTH_USERNAME)")
modparam("uac", "auth_password_avp", "$avp(AVP_AUTH_PASSWORD)")
modparam("uac", "auth_realm_avp", "$avp(AVP_AUTH_REALM)")
#!endif



ip a l
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:50:56:b5:c1:48 brd ff:ff:ff:ff:ff:ff
    inet 172.20.120.53/24 brd 172.20.120.255 scope global ens192
       valid_lft forever preferred_lft forever
    inet 2xx.xx.xx.xx/29 scope global ens192
       valid_lft forever preferred_lft forever
    inet 172.20.120.56/24 scope global secondary ens192
       valid_lft forever preferred_lft forever
    inet 172.20.120.57/24 scope global secondary ens192
       valid_lft forever preferred_lft forever
    inet 172.20.120.58/24 scope global secondary ens192
       valid_lft forever preferred_lft forever
    inet 172.20.120.55/24 brd 172.20.120.255 scope global secondary ens192
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:feb5:c148/64 scope link
       valid_lft forever preferred_lft forever

default via 172.20.120.253 dev ens192
172.20.120.0/24 dev ens192 proto kernel scope link src 172.20.120.53
2xx.xx.xx.xx/29 dev ens192 proto kernel scope link src 2xx.xx.xx.xx

-- 

Kind Regards

Mit freundlichen Grüßen
*Karsten Horsmann*

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--

Daniel-Constantin Mierla - http://www.asipto.com

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