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An iptables firewall configuration template.

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Your 2nd ICMP ruleset has a type in the log line. Should be 11/0 not 8/0 /sbin/iptables -A INPUT -p icmp -d $DEMOSTHENES --icmp-type **8/0** -j LOG --log-level 7 --log-prefix...

https://github.com/danielmiessler/iptables/blob/110ee9ee11942c03a671e77bef8a622f6e60f25c/firewall.sh#L44 should read 11/0, not 8/0