How to disable ipv6 in Debian

Here are simple steps to disable ipv6 in Debian:

1. Comment out anything related to ipv6 in /etc/hosts
2. SSH. Ensure AddressFamily inet is set in/etc/ssh/sshd_config. Restart ssh.
3. BIND. Ensure listen-on-v6 { none; }; in/etc/bind/named.conf.options. Restart bind9.
4. NTP. Ensure -4 option is set in /etc/default/ntp (e.g. NTPD_OPTS=’-4 -g’). Restart ntp.
5. APACHE2. Ensure Listen 0.0.0.0:80 in/etc/apache2/ports.conf file. Restart apache2.

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