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Debian

Initial

env | grep LANG
export LANG=en_US.UTF-8
dpkg-reconfigure locales

nano /etc/hostname -> hostname
nano /etc/hosts -> 127.0.1.1 hostname.yourdomain.tld hostname
invoke-rc.d hostname.sh start
invoke-rc.d networking force-reload
invoke-rc.d network-manager force-reload


nano /etc/ssh/sshd_config -> permitrootlogin no

apt-get install ufw
ufw default deny incoming
ufw default allow outgoing
ufw allow ssh 
ufw allow 22 
ufw enable

Disable ipv6

nano /etc/sysctl.conf

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

ip -6 addr del <ipv6address>/<prefixlength> dev <interface> 

echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
nano /etc/sysctl.d/01-disable-ipv6.conf
net.ipv6.conf.all.disable_ipv6 = 1