network/salt/firewall/priv-stateful.sh

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#!/bin/sh
export PATH=/sbin:/bin:/usr/sbin:/usr/bin
if [ echo "$IFACE" | grep priv >/dev/null ]; then
iptables -F FORWARD
ip6tables -F FORWARD
iptables -P FORWARD DROP
ip6tables -P FORWARD DROP
iptables -A FORWARD -m state --state ESTABLISHED -j ACCEPT
ip6tables -A FORWARD -m state --state ESTABLISHED -j ACCEPT
# loopback
iptables -A FORWARD -i lo -j ACCEPT
ip6tables -A FORWARD -i lo -j ACCEPT
# DHCP
iptables -A FORWARD -i $IFACE -p udp --dport 67 -j ACCEPT
# Deny by default
iptables -A FORWARD -j REJECT
ip6tables -A FORWARD -j REJECT
fi