I believe kamailio bound to the correct ip, regardless of whether the listed output via the tool (netstat/ss) is long or short form of ipv6, it should be considerably irrelevant https://datatracker.ietf.org/doc/html/rfc4291#section-2.2 You should be focusing on the "not able to register" part, not the bind part, could be very well the client issue.

rgds, Loi Dang Thanh Phone : +84. 774.735.448 Email : loi.dangthanh@gmail.com

On Wed, Apr 16, 2025 at 4:13 PM Sergei Safarov via sr-users < sr-users@lists.kamailio.org> wrote:

As I know netstat stip long IPv6 addresses during output. Try using

ss -l -n

On Wed, 2025-04-09 at 16:10 +0700, Vu Nguyen via sr-users wrote:

*Dear Sir,*

I have opened an issue on GitHub: *"IPv6 bind wrong IP. #4199 https://github.com/kamailio/kamailio/issues/4199"*.

*System Details:*

*Kamailio (5.8.x)* – SIP Proxy

*FreeSWITCH* – Media Server

*OS* – Debian 12

*Gateway* – aaaa:bbb:cccc:20::1

*IPv6 Address* – aaaa:bbb:cccc:20::41e

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*kamailio.cfg:*

#!define ADDR_IPV4 xxx.xxx.xxx.xxx #!define ADDR_IPV6 [aaaa:bbb:cccc:20::41e] listen=ADDR_IPV4 listen=ADDR_IPV6

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*netstat Output:*

tcp6 0 0 aaaa:bbb:cccc:20:::5060 :::* LISTEN 1691274/kamailio tcp6 0 0 aaaa:bbb:cccc:20:::5061 :::* LISTEN 1691274/kamailio udp6 0 0 aaaa:bbb:cccc:20:::5060 :::* 1691222/kamailio

As shown, although I explicitly set the listen IP to aaaa:bbb:cccc:20::41e, Kamailio strips the last part of the address and binds to aaaa:bbb:cccc:20::

I also upgraded to *version 6.0* with default cfg and set auto_bind_ipv6=1 or changed ipv6 address, but the issue still persists.

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*IPv6 Interface Configuration:*

auto eth1 iface eth1 inet6 static address aaaa:bbb:cccc:20::41e netmask 64 gateway aaaa:bbb:cccc:20::1

I can successfully ping in and out using this IPv6 address.

Do I need to configure anything else in Kamailio or the system to ensure it binds to the full IPv6 address aaaa:bbb:cccc:20::41e as expected?

Currently I can register with ipv4, but ipv6 does not.

Thank you for your assistance. __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions -- sr-users@lists.kamailio.org To unsubscribe send an email to sr-users-leave@lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender!

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Kamailio - Users Mailing List - Non Commercial Discussions -- sr-users@lists.kamailio.org To unsubscribe send an email to sr-users-leave@lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender!