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<p><FONT class=normalfont><B><font color=blue>squid+iptables建立internet网关</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>系统环境:<br>
<br>
RedHat 7.2<br>
squid (http://squid-cache.org/)<br>
1. 系统设置：<br>
运行：setup<br>
选择server<br>
默认情况下iptables 和 ipchains都已经被选择了。请把ipchains去掉，只让iptables运行<br>
<br>
2. 安装squid<br>
建议从RedHat的安装光盘上安装<br>
mount /mnt/cdrom<br>
cd /mnt/cdrom/RedHat/RPMS/<br>
rpm -ivh squid-2.4.2.STABLE2-8.i386.rpm<br>
启动squid：/etc/rc.d/init.d/squid start<br>
<br>
***一般情况下默认安装的squid不用更改squid.conf文件就可以工作。<br>
<br>
3. 为配合iptables做透明网关更改squid.conf文件<br>
vi /etc/squid/squid.conf<br>
更改以下行：<br>
http_port 3128<br>
httpd_accel_host virtual<br>
httpd_accel_port 80<br>
httpd_accel_with_proxy on<br>
httpd_accel_uses_host_header on<br>
<br>
4. iptables设置：<br>
建议从这个脚本设置iptables规则。见附件。<br>
./iptables<br>
然后执行：<br>
service iptables save<br>
这样系统就会把刚才执行脚本的命令保存在 /etc/sysconfig/iptables里。下次系统就会<br>
自动加载这些规则<br>
如果你用这个脚本在你的系统上无法执行，可能是文件没有执行权限。<br>
chmod a+x iptables使之可执行。（不要把这个文件拷贝到/etc/rc.d/init.d/下执行。） <br>
<br>
#!/bin/sh<br>
<br>
<br>
INET_IP="222.222.222.1" #代理服务器的internet ip地址<br>
INET_IFACE="eth0" #代理服务的网卡设备<br>
<br>
<br>
<br>
LAN_IP="192.168.100.4" #代理服务器的内部地址<br>
LAN_IP_RANGE="192.168.100.0/16" #局域网的ip网段<br>
LAN_BCAST_ADRESS="192.168.100.255" #局域网的广播地址<br>
LAN_IFACE="eth1" 代理服务器内部网卡设备<br>
<br>
<br>
LO_IFACE="lo"<br>
LO_IP="127.0.0.1"<br>
<br>
#<br>
# IPTables Configuration.<br>
#<br>
<br>
IPTABLES="/sbin/iptables"<br>
<br>
<br>
<br>
###########################################################################<br>
#<br>
# 2. Module loading.<br>
#<br>
<br>
#<br>
# Needed to initially load modules<br>
#<br>
<br>
/sbin/depmod -a<br>
<br>
#<br>
# 2.1 Required modules<br>
#加载需要的模块<br>
<br>
/sbin/modprobe ip_tables<br>
/sbin/modprobe ip_conntrack<br>
/sbin/modprobe iptable_filter<br>
/sbin/modprobe iptable_mangle<br>
/sbin/modprobe iptable_nat<br>
/sbin/modprobe ipt_LOG<br>
/sbin/modprobe ipt_limit<br>
/sbin/modprobe ipt_state<br>
<br>
#<br>
# 2.2 Non-Required modules<br>
#<br>
<br>
#/sbin/modprobe ipt_owner<br>
#/sbin/modprobe ipt_REJECT<br>
#/sbin/modprobe ipt_MASQUERADE<br>
#/sbin/modprobe ip_conntrack_ftp<br>
#/sbin/modprobe ip_conntrack_irc<br>
<br>
###########################################################################<br>
#<br>
# 3. /proc set up.<br>
#<br>
<br>
#<br>
# 3.1 Required proc configuration<br>
#设置ip forward<br>
<br>
echo "1" > /proc/sys/net/ipv4/ip_forward<br>
<br>
#<br>
# 3.2 Non-Required proc configuration<br>
#<br>
<br>
echo "1" > /proc/sys/net/ipv4/conf/all/rp_filter<br>
#echo "1" > /proc/sys/net/ipv4/conf/all/proxy_arp<br>
#echo "1" > /proc/sys/net/ipv4/ip_dynaddr<br>
<br>
###########################################################################<br>
#<br>
# 4. rules set up.<br>
#<br>
<br>
######<br>
# 4.1 Filter table<br>
#<br>
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