Network Administration

sshd requires interface for ipv6

sshd requires the network interface name to be explicitly specified in order to listen on the designated IP address.

example:

# valid 
ListenAddress fe80::1%eth0
ListenAddress [fe80::1%eth0]
ListenAddress [fe80::1%eth0]:22

# invalid
ListenAddress fe80::1
ListenAddress [fe80::1]
ListenAddress [fe80::1]:22