Install
emerge --ask net-firewall/iptables
Ruleset (/etc/iptables/iptables.rules)
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp --dport 22 -j ACCEPT
-A INPUT -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 443 -j ACCEPT
-A INPUT -p icmp --icmp-type echo-request -j ACCEPT
COMMIT
iptables-restore < /etc/iptables/iptables.rules
rc-update add iptables default && rc-service iptables save
