Initial iptables configuration

iptables

# Flush iptables rules (start with a clean slate where all traffic to all destinations is allowed)
iptables -F
# Allow loopback traffic
iptables -A INPUT -i lo -j ACCEPT
# Reject traffic destined to any port on IP address 127.0.0 through 127.0.0.7
# iptables -A INPUT -i ! lo -d 127.0.0.0/8 -j REJECT
# Allow all ESTABLISHED and RELATED connections to stay up
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# Allow all external hosts to be reachable from the box
iptables -A OUTPUT -j ACCEPT
# Allow PostgreSQL (port 5432) to accept connections
iptables -A INPUT -p tcp --dport 5432 -j ACCEPT
# Allow Apache (ports 80/443) to accept connections
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j ACCEPT
# Allow new inbound SSH connections (don't forget this rule, or you can't log in!)
iptables -A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT
# Respond to pings
iptables -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT
# Rejet all other INPUT/FORWARD traffic
iptables -A INPUT -j REJECT
iptables -A FORWARD -j REJECT
# Save these rules to be reloaded on boot
service iptables save