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Creating a configuration file mkdir /etc/iptables touch /etc/iptables/rc.firewall chmod +x /etc/iptables/rc.firewall nano -w /etc/iptables/rc.firewall #!/bin/bash # Setting variables ipt="/usr/sbin/iptables" iface="ifname" # SYN Rate (pps) syn_...

Updating the system apt update apt upgrade Creating a user adduser username usermod -aG sudo username Setting up SSH mkdir /home/username/.ssh/ touch /home/username/.ssh/authorized_keys nano -w /home/username/.ssh/authorized_keys chown -R username:...

Creating a config file touch /etc/rc.local chmod +x /etc/rc.local nano -w /etc/rc.local #!/bin/sh -e # # rc.local # # This script is executed at the end of each multiuser runlevel. # Make sure that the script will "exit 0" on success or any other #...

Setting up a timezone timedatectl list-timezones timedatectl set-timezone Pacific/Auckland Checking the packages (getting rid of systemd-timesyncd, adding ntp/ntpsec) apt list ntp systemd-timesyncd systemctl status ntp Configuring NTP nano -w /etc/ntp...

Creating a config file and setting things up (more details here) mkdir /etc/systemd/journald.conf.d/ touch /etc/systemd/journald.conf.d/null.conf nano -w /etc/systemd/journald.conf.d/null.conf [Journal] Storage=persistent Compress=100M SystemMaxUse=5G...

Installing knockd apt install knockd systemctl enable knockd Making the config file to look something like this (remember to change the port sequence and set the interface for knockd to listen on) nano -w /etc/knockd.conf [options] UseSyslog ...