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Quick Script to Emulate Basic DHCP Trusted Ports / DHCP Snooping / DHCP Filtration
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#!/bin/bash | |
# Root Check | |
if [ $(whoami) != 'root' ]; then | |
echo "ERROR: Must be root to run $0" | |
exit 1; | |
fi | |
TRUSTED_PORTS=( swp1 swp3 ) | |
SNOOPFILE=/etc/cumulus/acl/policy.d/90dhcp_snooping.rules | |
echo "###########################" | |
echo " Writing new DHCP Rules to: $SNOOPFILE" | |
echo "###########################" | |
echo "[iptables]" > $SNOOPFILE | |
for port in "${TRUSTED_PORTS[@]}"; do | |
echo "-A FORWARD -i $port -p udp -m udp --sport 67 -j ACCEPT" >> $SNOOPFILE | |
done | |
echo "-A FORWARD -i swp+ -p udp -m udp --sport 67 -j DROP" >> $SNOOPFILE | |
echo " done." | |
echo "###########################" | |
echo " Applying New DHCP Rules..." | |
echo "###########################" | |
cl-acltool -i | |
exit 0 |
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