1

#!/bin/sh
iptables -F
modprobe ip_conntrack_ftp
modprobe iptable_nat
modprobe ip_nat_ftp
 
iptables -P INPUT DROP
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT
 
iptables -A INPUT -s 10.0.0.0/24 -p tcp --dport 21 -j ACCEPT
iptables -A INPUT -s 192.168.100.0/24 -p tcp --dport 21 -j ACCEPT
iptables -A INPUT -s 218.19.231.55 -p tcp --dport 21 -j ACCEPT
iptables -A INPUT -s 192.168.100.0/24 -p tcp --dport 22 -j ACCEPT
iptables -A INPUT -s 192.168.100.0/24 -p tcp --dport 22 -j ACCEPT
iptables -A INPUT -s 192.168.100.0/24 -p udp --dport 161 -j ACCEPT
iptables -A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp -m state --state NEW -m tcp --dport 8080 -j ACCEPT

2

#!/bin/sh
IPTABLES=/sbin/iptables
# clear
$IPTABLES -F
# if pkg type is allow, then accept
#$IPTABLES -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# 如果同时在80端口的连接数大于10，就Drop掉这个ip
netstat -an | grep :80 | awk -F: '{ print $8 }' | sort | uniq -c | awk -F\   '$1>10 && $2!="" { print $2 }' >> /etc/fw.list
less /etc/fw.list | sort | uniq -c | awk -F\   '$2!="" { print $2 }' > /etc/fw.list2
less /etc/fw.list2 > /etc/fw.list
while read line
       do
       t=`echo "$line"`
       $IPTABLES -A INPUT -p tcp -s $t -j DROP
done < /etc/fw.list2
# IP转发
$IPTABLES -A INPUT -p tcp --dport 20002 -j ACCEPT
$IPTABLES -A INPUT -d 172.16.204.7 -p tcp -m tcp --dport 20002 -i eth0 -j ACCEPT
$IPTABLES -t nat -A PREROUTING -d 211.100.39.44 -p tcp -m tcp --dport 20002 -j DNAT --to-destination 172.16.204.7:20002
$IPTABLES -t nat -A POSTROUTING -d 172.16.204.7 -p tcp -m tcp --dport 20002 -j SNAT --to-source 10.6.39.44
 
# if pkg visit 80,7710 port then accept
$IPTABLES -A INPUT -p tcp --dport 80 -j ACCEPT
$IPTABLES -A INPUT -p tcp --dport 8080 -j ACCEPT
$IPTABLES -A INPUT -p tcp --dport 22 -j ACCEPT
$IPTABLES -A INPUT -p tcp --dport 873 -j ACCEPT
# $IPTABLES -A INPUT -i eth0 -m limit --limit 1/sec --limit-burst 5 -j ACCEPT
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,ACK,FIN,RST SYN -m limit --limit 30/m --limit-burst 2 -j ACCEPT
$IPTABLES -A FORWARD -p tcp --syn -m limit --limit 10/s -j ACCEPT
$IPTABLES -A FORWARD -f -m limit --limit 100/s --limit-burst 100 -j ACCEPT
# if pkg from allow ip then accept
$IPTABLES -A INPUT -p tcp -s 127.0.0.1   -j ACCEPT
# if pkg not above then deny
$IPTABLES -A INPUT -p tcp --syn -j DROP

3

#!/bin/sh
IPTABLES="/sbin/iptables"
echo "1" > /proc/sys/net/ipv4/ip_forward
$IPTABLES -P INPUT DROP
$IPTABLES -P FORWARD DROP
$IPTABLES -P OUTPUT DROP
$IPTABLES -F
$IPTABLES -X
$IPTABLES -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A INPUT -p tcp --dport 22 -j ACCEPT
$IPTABLES -A INPUT -p tcp --dport 80 --tcp-flags SYN,ACK,FIN,RST SYN -m limit --limit 30/m --limit-burst 2 -j ACCEPT
$IPTABLES -A OUTPUT -p tcp -s 127.0.0.1 -j ACCEPT
$IPTABLES -A OUTPUT -p tcp -s 192.168.1.102 -j ACCEPT
$IPTABLES -A OUTPUT -p udp -s 127.0.0.1 -j ACCEPT
$IPTABLES -A OUTPUT -p udp -s 192.168.1.102 -j ACCEPT
$IPTABLES -A INPUT -p tcp --syn -j DROP