Problem: I do not know iptables
Solution: Use a firewall script I found years ago in a Slackware security guide written by Chess Griffin. Create an empty file and name it rc.firewall. Open it and paste the following:


	# rc.firewall for
	# Basic Slackware Security

	# These two rules set the default policies, i.e. what to do if a
	# packet doesn't match any other rule, to drop any packet coming
	# into (INPUT) or routing through (FORWARD) the box.
	iptables -P INPUT DROP
	iptables -P FORWARD DROP

	# These rules are added (-A) to the INPUT chain.  They allow packets
	# from any previously established connections and accept anything
	# from the loopback interface.
	iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
	iptables -A INPUT -s -d -i lo -j ACCEPT

	# This rule added to the INPUT chain accepts any ssh connections.
	iptables -A INPUT -p tcp --dport 22 -i wlan0 -j ACCEPT

You may need to change the eth0 interface. Save rc.firewall, move it to /etc/rc.d and make it executable:

chmod +x /etc/rc.d/rc.firewall

Now, start the script:

/etc/rc.d/rc.firewall start

Later, it should be started automatically from /etc/rc.d/rc.inet2 upon boot.

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