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<p><FONT class=normalfont><B><font color=blue>iptables设置一例</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者：作者<br>来自：Linux知识宝库<br>联系方式：无名<br><br>只需要一个公网地址设在外接口上，内部用私网地址组网即可，在内部服务器提供Internet服务。<br>
<br>
<br>
#!/bin/sh<br>
<br>
#--------------------------------------------<br>
#<br>
#  外接口eth0，开放 vpn ssh<br>
#  内接口eth1，绑定 dhcp dns squid<br>
#  向内部服务器转发 ftp smtp www pop3<br>
#  支持透明代理<br>
#<br>
#  胖头鱼：pangty@ta139.com<br>
#<br>
#--------------------------------------------<br>
<br>
EXT_IF="eth0"<br>
INT_IF="eth1"<br>
EXT_IP="" #公网IP<br>
INT_IP="" #内接口IP<br>
SERVER_IP="" #内部服务器IP<br>
<br>
# pptpd_vpn_service ssh<br>
TRUSTED_LOCAL_TCP_PORT="1723 22"<br>
TRUSTED_LOCAL_UDP_PORT="22"<br>
<br>
# ftp-data ftp smtp http pop3<br>
FWD_TCP_PORT="20 21 25 80 110"<br>
FWD_UDP_PORT="20 21 25 80 110"<br>
<br>
# load any special modules<br>
modprobe ip_nat_ftp<br>
modprobe ip_conntrack_ftp<br>
modprobe ip_nat_irc<br>
modprobe ip_conntrack_irc<br>
<br>
# turn on ip forwarding<br>
echo "1" &gt; /proc/sys/net/ipv4/ip_forward<br>
<br>
# setting up ip spoofing protection<br>
for f in /proc/sys/net/ipv4/conf/*/rp_filter; do<br>
echo 1 &gt; $f<br>
done<br>
<br>
# delete any existing chains<br>
iptables -F -t filter<br>
iptables -X -t filter<br>
iptables -Z -t filter<br>
iptables -F -t nat<br>
iptables -X -t nat<br>
iptables -Z -t nat<br>
<br>
# setting up default policies<br>
iptables -P INPUT DROP<br>
iptables -P FORWARD DROP<br>
iptables -P OUTPUT ACCEPT<br>
iptables -t nat -P PREROUTING ACCEPT<br>
iptables -t nat -P POSTROUTING ACCEPT<br>
iptables -t nat -P OUTPUT ACCEPT<br>
<br>
#---------------------- filter ---------------------<br>
<br>
# allow ping from internet<br>
iptables -A INPUT -i $EXT_IF -p icmp -j ACCEPT<br>
<br>
# enable local traffic<br>
#------------------------------------------------------------------------<br>
# iptables -A INPUT ! -i $EXT_IF -m state --state NEW -j ACCEPT<br>
# iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT<br>
#<br>
# iptables -A FORWARD ! -i $EXT_IF -m state --state NEW -j ACCEPT<br>
# iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT<br>
#------------------------------------------------------------------------<br>
<br>
iptables -N allowed<br>
iptables -A allowed ! -i $EXT_IF -m state --state NEW -j ACCEPT<br>
iptables -A allowed -m state --state ESTABLISHED,RELATED -j ACCEPT<br>
<br>
iptables -A INPUT -j allowed<br>
iptables -A FORWARD -j allowed<br>
<br>
for PORT in $TRUSTED_LOCAL_TCP_PORT; do<br>
iptables -A INPUT -i $EXT_IF -p tcp --dport $PORT -m state --state NEW -j <br>
ACCEPT<br>
<br>
done<br>
<br>
for PORT in $TRUSTED_LOCAL_UDP_PORT; do<br>
iptables -A INPUT -i $EXT_IF -p udp --dport $PORT -m state --state NEW -j <br>
ACCEPT<br>
<br>
done<br>
<br>
#---------------------- nat ---------------------<br>
<br>
# port forwarding<br>
for PORT in $FWD_TCP_PORT; do<br>
   iptables -A FORWARD -i $EXT_IF -o $INT_IF -d $SERVER_IP <br>
       -p tcp --dport $PORT -m state --state NEW -j ACCEPT<br>
   iptables -t nat -A PREROUTING -d $EXT_IP <br>
       -p tcp --dport $PORT -j DNAT --to-destination $SERVER_IP<br>
   iptables -t nat -A POSTROUTING -d $SERVER_IP <br>
       -p tcp --dport $PORT -j SNAT --to-source $INT_IP<br>
done<br>
<br>
for PORT in $FWD_UDP_PORT; do<br>
   iptables -A FORWARD -i $EXT_IF -o $INT_IF -d $SERVER_IP <br>
       -p udp --dport $PORT -m state  --state NEW -j ACCEPT<br>
   iptables -t nat -A PREROUTING -d $EXT_IP <br>
       -p udp --dport $PORT -j DNAT --to-destination $SERVER_IP<br>
   iptables -t nat -A POSTROUTING -d $SERVER_IP <br>
       -p udp --dport $PORT -j SNAT --to-source $INT_IP<br>
done<br>
<br>
# Transparent Proxy<br>
iptables -t nat -A PREROUTING -i $INT_IF -p tcp --dport 80 -j REDIRECT --to-<br>
port 3128<br>
<br>
<br>
# SNAT or MASQUERADE<br>
#------------------------------------------------------------------------<br>
# iptables -t nat -A POSTROUTING -o $EXT_IF -j SNAT --to-source $EXT_IP<br>
#------------------------------------------------------------------------<br>
iptables -t nat -A POSTROUTING -o $EXT_IF -j MASQUERADE<br>
<br>
# THE END<br>
</FONT><br>
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