Listing 4. iptables Rules to Allow IPSec

bash-# iptables -A INPUT -p udp -m udp --sport 500 --dport 500 -j ACCEPT
bash-# iptables -A INPUT -p 50 -j ACCEPT
bash-# iptables -A INPUT -p 51 -j ACCEPT
bash-# iptables -A OUTPUT -p udp -m udp --sport 500 --dport 500 -j ACCEPT
bash-# iptables -A OUTPUT -p 50 -j ACCEPT
bash-# iptables -A OUTPUT -p 51 -j ACCEPT