File knock-0.5.patch of Package knock

--- knockd.conf
+++ knockd.conf
@@ -4,12 +4,12 @@
 [openSSH]
 	sequence    = 7000,8000,9000
 	seq_timeout = 5
-	command     = /usr/sbin/iptables -A INPUT -s %IP% -p tcp --dport 22 -j ACCEPT
+	command     = /usr/sbin/iptables -I input_ext 1 -p tcp -s %IP% -p tcp --dport 22 -j ACCEPT --dport 22
 	tcpflags    = syn
 
 [closeSSH]
 	sequence    = 9000,8000,7000
 	seq_timeout = 5
-	command     = /usr/sbin/iptables -D INPUT -s %IP% -p tcp --dport 22 -j ACCEPT
+	command     = /usr/sbin/iptables -D input_ext -p tcp -s %IP% -p tcp --dport 22 -j ACCEPT --dport 22
 	tcpflags    = syn