iptables.up.rules

*nat
-A POSTROUTING -o eth0 -j MASQUERADE
COMMIT


*filter

# Allows all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0
-A INPUT -i lo -j ACCEPT
-A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT

# Accepts all established inbound connections
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

-A INPUT -m policy --dir in --pol ipsec -p udp --dport 1701 -j ACCEPT
-A INPUT -p udp --dport 1701 -j REJECT

-A OUTPUT -m policy --dir out --pol ipsec -p udp --sport 1701 -j ACCEPT
-A OUTPUT -p udp --sport 1701 -j REJECT


# Allows all outbound traffic
# You could modify this to only allow certain traffic
-A OUTPUT -j ACCEPT

# Allows HTTP and HTTPS connections from anywhere (the normal ports for websites)
-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW --dport 44 -j ACCEPT
-A INPUT -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 443 -j ACCEPT

-A INPUT -p udp --dport 500 -j ACCEPT
-A INPUT -p udp --dport 4500 -j ACCEPT


# Allows SSH connections for script kiddies
# THE -dport NUMBER IS THE SAME ONE YOU SET UP IN THE SSHD_CONFIG FILE
# -A INPUT -p tcp -m state --state NEW --dport 30000 -j ACCEPT

# Now you should read up on iptables rules and consider whether ssh access 
# for everyone is really desired. Most likely you will only allow access from certain IPs.

# Allow ping
-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT

# log iptables denied calls (access via 'dmesg' command)
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7

# Reject all other inbound - default deny unless explicitly allowed policy:
-A INPUT -j DROP

-A FORWARD -p tcp -m multiport --dports 25,137:139,445 -j REJECT --reject-with icmp-admin-prohibited
-A FORWARD -p udp --dport    137:139 -j REJECT --reject-with icmp-admin-prohibited

-A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
-A FORWARD --src 10.0.0.0/24 -o eth0 -m state --state NEW -j ACCEPT
-A FORWARD -j DROP


COMMIT