How do I enable OpenSSH SSH server to listen on an IPv6 address under Linux or UNIX operating systems?
The ListenAddress directive in sshd_config file specifies the local addresses sshd should listen on. The syntax is as follows:
ListenAddress host ListenAddress IPv4_addr:port ListenAddress [IPv6_addr]:port
Edit /etc/ssh/sshd_config file, enter:
# vi /etc/ssh/sshd_config
To bind sshd to every IPv4 and IPv6 address on your server, enter:
ListenAddress 0.0.0.0 ListenAddress ::
To bind sshd to every IPv6 2607:f0d0:1002:11::2 address on your server, enter:
To bind sshd to every IPv6 2607:f0d0:1002:11::2 address and port 311 on your server, enter:
From the sshd_man page:
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If port is not specified, sshd will listen on the address and all prior Port options specified. The default is to listen on all local addresses. Multiple ListenAddress options are permitted. Additionally, any Port options must precede this option for non port qualified addresses.