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How to block more than 3 ping requests from a host through iptables?

bw flag

i want to block more than 3 ping echo-requests for demonstration purpose of my college practical, and i am unable to do so using the following rules in my firewall.

iptables -A INPUT -p icmp --icmp-type echo-request -m limit --limit 3/s -j ACCEPT
iptables -A INPUT -p icmp --icmp-type echo-request -j DROP

Pinging from a windows / linux client doesn't block more than 3 pings. Also wanted to know how to protect from a SYN Flood attack by using iptables.

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