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<font face="monospace">Hi Ray,<br>
<br>
Do you use any TCP aliasing options in your cfg ?<br>
<br>
Regards,<br>
</font>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="https://www.opensips-solutions.com">https://www.opensips-solutions.com</a>
<a class="moz-txt-link-freetext" href="https://www.siphub.com">https://www.siphub.com</a></pre>
<div class="moz-cite-prefix">On 9/2/23 3:17 AM, Ray Jackson wrote:<br>
</div>
<blockquote type="cite"
cite="mid:864e2852-950a-9cff-f38e-9910e344b417@hero.co.nz">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<p>Hi all,</p>
<p>I'm facing a weird issue which I think is related to broken TCP
socket reuse logic where the wrong client is receiving incoming
calls due to the wrong socket being used for the incoming
INVITE.<br>
</p>
<p>The scenario is when I have 2 clients registering using TLS
behind NAT at the same Public IPv4 address and both clients are
using the same private port number. So client 1 registers and
the Via and contact header looks like:<br>
</p>
<p><span style="box-sizing: border-box; color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; font-weight: bold;">Via: </span><span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"> SIP/2.0/TLS 192.168.42.162:5062;</span><span style="box-sizing: border-box; color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; font-weight: bold;">branch=</span><span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">z9hG4bK1409895926;rport;alias
</span><span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">
</span><span style="box-sizing: border-box; color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; font-weight: bold;">Contact: </span><span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"> <<a class="moz-txt-link-freetext" href="sip:201@192.168.42.162:5062" moz-do-not-send="true">sip:201@192.168.42.162:5062</a>;</span><span style="box-sizing: border-box; color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; font-weight: bold;">transport=</span><span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">tls>;</span><span style="box-sizing: border-box; color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; font-weight: bold;">reg-id=</span><span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">2;+sip.instance="<a class="moz-txt-link-rfc2396E" href="urn:uuid:00000000-0000-1000-8000-C074AD928AC4" moz-do-not-send="true"><urn:uuid:00000000-0000-1000-8000-C074AD928AC4></a>"</span></p>
<p>Client 2 registers from behind the same Public IPv4 address and
the Via and contact header looks like:</p>
<p><span style="box-sizing: border-box; color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; font-weight: bold;">Via: </span><span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"> SIP/2.0/TLS 192.168.42.186:5062;</span><span style="box-sizing: border-box; color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; font-weight: bold;">branch=</span><span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">z9hG4bK-aff1f3b3
</span><span style="box-sizing: border-box; color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; font-weight: bold;">Contact: </span><span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"> <<a class="moz-txt-link-freetext" href="sip:202@192.168.42.186:5062" moz-do-not-send="true">sip:202@192.168.42.186:5062</a>;</span><span style="box-sizing: border-box; color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; font-weight: bold;">transport=</span><span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">tls>;expire</span><span style="box-sizing: border-box; color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; font-weight: bold;">s=</span><span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">300</span></p>
<p>The location table shows Client 1 received field of
103.212.1.2:5062 and Client 103.212.1.2:23456 <br>
</p>
<p>When a call comes in for Client 1 the location lookup seems to
return the correct 'received' address and port (e.g.
103.212.1.2:5062) and all the logs indicate that this is where
the SIP INVITE *should* be going to (in the $du field). However
when you check the SIP traffic it selects Client 2's socket and
the traffic goes to port 23456 instead of 5062.</p>
<p>I think this is related somehow to the TCP port reuse logic
inside Opensips. My suspicion is that Opensips is looking at
the Contact or Via port number (which is the same for both
client 1 and 2) and then somehow mapping this to the wrong TCP
received socket.</p>
<p>Does anybody have any suggestions here? Should I be fixing the
NAT in the Contact header (using fix_nated_contact). I read
somewhere that you shouldn't rewrite the Contact header to avoid
problems with sending a different Contact URI to the client on
calls. Or is this issue more related to the Via header and the
TCP port reuse logic looking at this port instead of the actual
received port when choosing the outgoing socket?</p>
<p>FYI: I am using both force_rport() and fix_nated_register() for
incoming registrations from these clients and matching_mode of 0
in usrloc. However, I am not using fix_nated_contact() for
registrations.</p>
<p>Thanks,</p>
<p>Ray<br>
</p>
<p><br>
<span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"></span><span style="color: rgb(80, 80, 80); font-family: Roboto, "Helvetica Neue", sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"></span></p>
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