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The firewall choices are:<br>
0 - NONE: This script will not set any firewall rules. You are responsible<br>
for ensuring the security of your machine. You are STRONGLY<br>
recommended to use some kind of firewall rules.<br>
1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation<br>
2 - MASQUERADE: Appropriate for a machine acting as an Internet gateway<br>
for a LAN<br>
Choose a type of firewall (0-2): 由于我们要在后面使用iptables,所以选择2<br>
<br>
Start this connection at boot time<br>
<br>
Do you want to start this connection at boot time?<br>
Please enter no or yes (default no): 我这里不是包月,所以选择no,如果你是包月的话就选yes<br>
<br>
** Summary of what you entered **<br>
<br>
Ethernet Interface: eth1<br>
User name: username<br>
Activate-on-demand: No<br>
DNS: Do not adjust<br>
Firewalling: MASQUERADE<br>
User Control: yes<br>
Accept these settings and adjust configuration files (y/n)? 选择yes,保存设置.<br>
<br>
<br>
用adslsetup命令配置好ppp0后,我们在Xwindows下看一下ppp0的配置<br>
<br>
<br>
注意这里我们把自动从提供商处获取DNS信息选上,这部非常关键,否则到后面即使客户端能上网,本地服务器也看不了网页。<br>
<br>
好了到此位置,adsl配置完成,我们用命令adsl-start来激活ADSL连接<br>
<br>
基本如果你能ping通外面的IP地址就行了,最多再用nslookup命令来测试一下<br>
DNS是否正常。<br>
<br>
只有在确认ADSL连接没问题后,我们才来配置iptables.<br>
<br>
修改/etc/sysconfig/iptables(把原有的内容都删除),修改完如下<br>
<br>
# Firewall configuration written by lokkit<br>
# Manual customization of this file is not recommended.<br>
# Note: ifup-post will punch the current nameservers through the<br>
# firewall; such entries will *not* be listed here.<br>
*mangle<br>
:PREROUTING ACCEPT [0:0]<br>
:INPUT ACCEPT [0:0]<br>
:FORWARD ACCEPT [0:0]<br>
:OUTPUT ACCEPT [0:0]<br>
:POSTROUTING ACCEPT [0:0]<br>
*nat<br>
:PREROUTING ACCEPT [0:0]<br>
:POSTROUTING ACCEPT [0:0]<br>
:OUTPUT ACCEPT [0:0]<br>
[0:0]-A POSTROUTING -o ppp0 -j MASQUERADE<br>
COMMIT<br>
*filter<br>
:INPUT ACCEPT [0:0]<br>
:FORWARD ACCEPT [0:0]<br>
:OUTPUT ACCEPT [0:0]<br>
COMMIT<br>
<br>
<br>
修改/etc/sysctl.conf,把net.ipv4.ip_forward设置成1,如下:<br>
net.ipv4.ip_forward = 1<br>
如此一来,每次你重新启动机器或重新启动网络服务(/etc/init.d/network restart)时就会自动启动ip转发功能!<br>
<br>
重起iptables服务:<br>
/etc/rc.d/init.d/iptables restart<br>
<br>
iptables -t nat -L -n 看代理规则是否正确,结果如下:<br>
[root@localhost root]# iptables -t nat -L -n<br>
Chain PREROUTING (policy ACCEPT)<br>
target prot opt source destination<br>
<br>
Chain POSTROUTING (policy ACCEPT)<br>
target prot opt source destination<br>
MASQUERADE all -- 0.0.0.0/0 0.0.0.0/0<br>
<br>
Chain OUTPUT (policy ACCEPT)<br>
target prot opt source destination<br>
<br>
cat /proc/sys/net/ipv4/ip_forward 看值是否为1,结果如下:[/b]<br>
[root@localhost root]$ cat /proc/sys/net/ipv4/ip_forward<br>
1<br>
<br>
<br>
其实到现在如果你的客户段是静态设置ip地址,现在就可以通过服务器共享上网了,如果你还要配置DHCP服务器的话,修改/etc/dhcpd.conf<br>
#Start of /etc/dhcpd.conf<br>
ddns-update-style interim;<br>
ignore client-updates;<br>
subnet 192.168.0.0 netmask 255.255.255.0 {<br>
# --- default gateway<br>
option routers 192.168.0.1;<br>
option subnet-mask 255.255.255.0;<br>
# --- option domain-name-servers ISP's DNS1,ISP's DNS2;<br>
option domain-name-servers 192.168.0.1,202.106.0.20,202.106.148.1;<br>
option time-offset -18000; # Eastern Standard Time<br>
# --- Selects point-to-point node (default is hybrid). Don't change this unless<br>
# -- you understand Netbios very well<br>
# option netbios-node-type 2;<br>
range dynamic-bootp 192.168.0.2 192.168.0.254;<br>
default-lease-time 21600;<br>
max-lease-time 43200;<br>
}<br>
#End of /etc/dhcpd.conf<br>
<br>
关于squid的配置我就不讲了,非常简单哦,只不过在配置过程中需要主要配置dns地址。默认使没有的,否则你在adsl没连接的情况下,squid是启动不了的,可参考dhcpd.conf的dns地址。<br>
<br>
好了,redhat服务器reboot后,所有windows客户端ipconfig/renew一下幸地址,服务器adsl-start后,一切都ok!什么时候想停止上网,只要在服务器端输入以下命令adsl-stop就可以
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