RedHat提供ADSL共享上網的解決辦法(轉)

RedHat提供ADSL共享上網的解決辦法(轉)[@more@]一、操作環境：

機器系統與配置：三臺機器的關健部件

第一臺：桌上型電腦，雙網路卡，8139和8029，作業系統RedHat 8.0

第二臺：Toshiba notebook，PC卡。RTL-8139/8139C/8139C+，作業系統RedHat 8.0

第三臺：桌上型電腦,8029網路卡，作業系統windowme

Hub[集線器]：Tp-Link 10M，8口

ADSL，乙太口，非路由。

二、網路卡設定如下：

在第一臺機器的雙網路卡的接法：把ADSL接在eth0上，把eth1接在HUB上。

第一塊網路卡的ip設定：

ip地址:192.168.0.1

掩碼:255.255.255.0

第二塊網路卡的設定

ip地址:192.168.0.2

掩碼：255.255.255.0

在這兩塊網路卡中，不要設定閘道器。

++++++++++++++++++++++++++++++++++++++++

第二臺：Toshiba notebook的網路卡設定

IP：192.168.0.6

掩碼：255.255.255.0

閘道器：192.168.0.1

DNS:設定電信給的，或者下面的也行

202.96.134.133

202.96.168.68

++++++++++++++++++++++++++++++++++++++++

第三臺機器的網路卡設定

P：192.168.0.8

掩碼：255.255.255.0

閘道器：192.168.0.1

DNS:設定電信給的，或者下面的也行

202.96.134.133

202.96.168.68

三、設定ppp拔號，

1]刪除原來的ppp的ADSL連結。

如果redhat-config-network原來已經用 redhat-config-network設定的ppp的ADSL連線拔號，用下面的命令呼叫刪除。

#redhat-config-network

2]在終端上以root許可權執行

#adsl-setup

進入設定過程：

Welcome to the ADSL client setup. First, I will run some checks on

your system to make sure the PPPoE client is installed properly...

LOGIN NAME

Enter your Login Name (default root): ADSL提供商給的使用者名稱，寫在這裡

INTERFACE

Enter the Ethernet interface connected to the ADSL modem

For Solaris, this is likely to be something like /dev/hme0.

For Linux, it will be ethX, where X is a number.

(default eth0): eth0這是ADSL透過第一臺機器的第一張網路卡eth0提供上網

Do you want the link to come up on demand, or stay up continuously?

If you want it to come up on demand, enter the idle time in seconds

after which the link should be dropped. If you want the link to

stay up permanently, enter no (two letters, lower-case.)

NOTE: Demand-activated links do not interact well with dynamic IP

addresses. You may have some problems with demand-activated links.

Enter the demand value (default no):在這裡按一下回車就行了。

DNS

Please enter the IP address of your ISPs primary DNS server.

If your ISP claims that the server will provide dynamic DNS addresses,

enter server (all lower-case) here.

If you just press enter, I will assume you know what you are

doing and not modify your DNS setup.

Enter the DNS information here: 202.96.134.133這是DSN，最好用你本地電信給的

Please enter the IP address of your ISPs secondary DNS server.

If you just press enter, I will assume there is only one DNS server.

Enter the secondary DNS server address here: 202.96.168.68這是第二個DNS，也是電信給的。

PASSWORD

Please enter your Password:在這裡把ADSL提供商給的密碼寫上

Please re-enter your Password:

USERCTRL

Please enter yes (two letters, lower-case.) if you want to allow

normal user to start or stop DSL connection (default yes): yes

FIREWALLING

Please choose the firewall rules to use. Note that these rules are

very basic. You are strongly encouraged to use a more sophisticated

firewall setup; however, these will provide basic security. If you

are running any servers on your machine, you must choose NONE and

set up firewalling yourself. Otherwise, the firewall rules will deny

access to all standard servers like Web, e-mail, ftp, etc. If you

are using SSH, the rules will block outgoing SSH connections which

allocate a privileged source port.

The firewall choices are:

0 - NONE: This script will not set any firewall rules. You are responsible

for ensuring the security of your machine. You are STRONGLY

recommended to use some kind of firewall rules.

1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation

2 - MASQUERADE: Appropriate for a machine acting as an Internet gateway

for a LAN

Choose a type of firewall (0-2): 2

Start this connection at boot time

Do you want to start this connection at boot time?

Please enter no or yes (default no):yes

** Summary of what you entered **

Ethernet Interface: eth0

User name: ADSL使用者名稱

Activate-on-demand: No

Primary DNS: 202.96.134.133

Secondary DNS: 202.96.168.68

Firewalling: MASQUERADE

User Control: yes

Accept these settings and adjust configuration files (y/n)?y

三、在/etc/rc.d/rc.local中加入如下：

echo 1 >; /proc/sys/net/ipv4/ip_forward

iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o ppp0 -j MASQUERADE

四、重新啟動機器。就OK了。

如果你覺得此文太長，其實很簡單，只要看第三點就行了。