iptables rules for a KVM host box

iptables.up.rules

*filter

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

# Allows all outbound traffic
 -A OUTPUT -j ACCEPT

# Allows HTTP and HTTPS connections from anywhere
 -A INPUT -p tcp --dport 443 -j ACCEPT
 -A INPUT -p tcp --dport 80 -j ACCEPT

# Allows SSH connections
 -A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT

# Allow connections from loopback and KVM virtual network adapter
 -A INPUT -i lo -j ACCEPT
 -A INPUT -i virbr0 -j ACCEPT

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

# log iptables denied calls (access via 'dmesg' or /var/log/syslog)
 -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 REJECT

# Disabled to allow hosted VMs access to the external network
# A much better solution would only forward the subnet with the VMs.
# -A FORWARD -j REJECT

COMMIT