Dear Sir,

I have opened an issue on GitHub: "IPv6 bind wrong IP. #4199".

System Details:

kamailio.cfg:

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

listen=ADDR_IPV4
listen=ADDR_IPV6

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.

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.