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thoward/iptables-block-udp.txt Secret

Created August 7, 2013 21:56
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iptables to block udp other than dns
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iptables-block-udp.txt
# allow dns requests to google nameservers
iptables -A OUTPUT -p udp --dport 53 -d 8.8.8.8 -j ACCEPT
iptables -A OUTPUT -p udp --dport 53 -d 8.8.4.4 -j ACCEPT
# block all other udp
iptables -A OUTPUT -p udp -j DROP
ip6tables -A OUTPUT -p udp -j DROP
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