From khorsmann@gmail.com Thu Jul  4 15:58:25 2019
From: Karsten Horsmann <khorsmann@gmail.com>
To: sr-users@lists.kamailio.org
Subject: Re: [SR-Users] kamailio as UAC and NAPTR / sendsocket question
Date: Thu, 04 Jul 2019 15:58:10 +0200
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Hi Frederico and Daniel.

Today i found also the "tcp_reuse_port" documentation. Thanks Federico for
the hint.
With that paramenter to yes - i have still the issue that kamailio
generates on force_send_socket or $fs (which is the same IMHO at the end)
generates UDP.
It forced the right IP but the transport is wrong. Without tcp_reuse_port
it was the same stuff.

I also tried a new listen param like "listen tcp:212.zz.xx.ab:8000" and
point it to that direction.
$fs and force_send_socket seems to be working with ip in that case. At the
bottom I xlogged the du prameter.

It feels like an special special corner case with naptr overwrite, uac and
empty du tcp.

$fs=3D"212.zz.xx.ab"

13:07:35.839094 IP (tos 0x10, ttl 64, id 62416, offset 0, flags [none],
proto UDP (17), length 472)
    212.zz.xx.ab.sip > 217.0.26.67.sip: [bad udp cksum 0x9796 -> 0x68cb!]
SIP, length: 444
        REGISTER sip:sip-trunk.telekom.de SIP/2.0
        Via: SIP/2.0/UDP
212.zz.xx.ab;branch=3Dz9hG4bKc689.5afe94c5000000000000000000000000.0;i=3D0
        To: <sip:+49xxxxxxxx(a)sip-trunk.telekom.de>
        From: <sip:+49xxxxxxxx(a)sip-trunk.telekom.de
>;tag=3D0e37b8f111de3a41f982d1e82cae2fe3-b388
        CSeq: 10 REGISTER
        Call-ID: 547d384144e9b23e-7166(a)212.zz.xx.ab
        Max-Forwards: 70
        Content-Length: 0
        User-Agent: SBC-OS
        Contact: <sip:49xxxxxxxx(a)212.zz.xx.ab>
        Expires: 360


Jul  4 13:10:01 siptrunk1 /usr/sbin/kamailio[9380]: INFO: <script>:
[tm:local-request] request rm:[REGISTER] from fu:[
sip:+49xxxxxxxx(a)sip-trunk.telekom.de] to ru:[sip:sip-trunk.telekom.de]
rP:[UDP] sut:[sip:212.zz.xx.ab:5060;transport=3Dtcp] du:[sip:
reg.sip-trunk.telekom.de] dP:[UDP]
Jul  4 13:10:01 siptrunk1 /usr/sbin/kamailio[9380]: ERROR: <script>: its
[REGISTER] [sip:sip-trunk.telekom.de]
Jul  4 13:10:11 siptrunk1 /usr/sbin/kamailio[9380]: INFO: <script>:
[tm:local-request] request rm:[REGISTER] from fu:[
sip:+49xxxxxxxx(a)sip-trunk.telekom.de] to ru:[sip:sip-trunk.telekom.de]
rP:[UDP] sut:[sip:212.zz.xx.ab:5060;transport=3Dtcp] du:[sip:
reg.sip-trunk.telekom.de] dP:[UDP]

Am Do., 4. Juli 2019 um 10:50 Uhr schrieb Federico Cabiddu <
federico.cabiddu(a)gmail.com>:

> Actually you can force the TCP socket (e.g. sending from the same socket
> you are listening on) if the kernel has support for SO_REUSEPORT (linux >
> 3.9, FreeBSD, OSX) and you enable tcp_reuse_port in kamailio configuration (
> https://www.kamailio.org/wiki/cookbooks/5.2.x/core#tcp_reuse_port).
>
> Best,
>
> Federico
>
> On Thu, Jul 4, 2019 at 10:27 AM Daniel Tryba <d.tryba(a)pocos.nl> wrote:
>
>> On Wed, Jul 03, 2019 at 06:38:28PM +0200, Karsten Horsmann wrote:
>> > any one here that can imagine why force sendsocket generates an udp
>> packet
>> > if the target accept only tcp? And without fs it generates an tcp
>> packet.
>> > For uac registrations outbound?
>>
>> Reading the cookbook documentation of force_send_socket raises
>> questions:
>>  Force to send the message from the specified socket (it _must_ be one
>>  of the sockets specified with the listen directive). If the
>>  protocol doesn't match (e.g. UDP message forced to a TCP
>>  socket) the closest socket of the same protocol is used.
>>
>> It relates to the listen directive, but if you are listening on a TCP
>> port/socket you can't use that port/socket to create new outbound
>> connections (to the best of my knowledge).
>>
>> You already tried $fs but without proto and port:
>>
>> https://www.kamailio.org/wiki/cookbooks/5.2.x/pseudovariables#fs_-_forced_=
socket
>> proto is taken from $du if missing and I guess port is 5060 if missing.
>> So if you are listening on 5060 tcp that can't be used for the outbound
>> message, 5060 from udp is the closed match perhaps.
>>
>>
>> _______________________________________________
>> Kamailio (SER) - Users Mailing List
>> sr-users(a)lists.kamailio.org
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
> _______________________________________________
> Kamailio (SER) - Users Mailing List
> sr-users(a)lists.kamailio.org
> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>


--=20
Mit freundlichen Gr=C3=BC=C3=9Fen
*Karsten Horsmann*



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