iptables ile Port Knocking
by Emre Tugriceri on Sep.11, 2007, under Linux
$IPTABLES -A INPUT -p tcp –dport 22 -m recent –rcheck
–seconds 60 –name SSH -j ACCEPT
$IPTABLES -A INPUT
-p tcp –dport 21 -m recent –rcheck –seconds 60 –name SSH -j
ACCEPT
$IPTABLES -A INPUT -p tcp –dport 1599 -m
recent –name SSH –remove -j DROP
$IPTABLES -A INPUT -p tcp –dport 1600 -m recent –name
SSH –set -j DROP
$IPTABLES -A INPUT -p tcp –dport 1601
-m recent –name SSH –remove -j DROP
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