added iptables samples

iptables/limit.sh

@@ -0,0 +1,10 @@
+#! /bin/bash
+
+IPTABLES="sudo /sbin/iptables"
+
+$IPTABLES --new-chain RATE-LIMIT
+$IPTABLES --append INPUT --match conntrack --ctstate NEW --jump RATE-LIMIT
+$IPTABLES --append RATE-LIMIT --match limit --limit 5/sec --limit-burst 20 --jump ACCEPT #5 packages per second
+$IPTABLES --append RATE-LIMIT --jump DROP
+
+echo "iptables input chain is now rate limiting"