iptables
iptables -A INPUT -p tcp –dport 999 -j REJECT
iptables -A INPUT -i eth0 –dport 4080 -j ACCEPT
iptables -A INPUT -p tcp –dport 9999 -j ACCEPT
iptables -A INPUT -p tcp –dport 999 -j REJECT
iptables -A INPUT -i eth0 –dport 4080 -j ACCEPT
iptables -A INPUT -p tcp –dport 9999 -j ACCEPT