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一、操作环境：
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  x" `/ t4 |% c* L7 g- o/ I2 y机器系统与配置：三台机器的关健部件
  }3 {. Y/ i8 j5 U3 D5 }第一台：台式机，双网卡，8139和8029，操作系统RedHat 8.0
第二台：Toshiba notebook，PC卡。RTL-8139/8139C/8139C+，操作系统RedHat 8.0
: ~6 h1 o; W' L  C& `第三台：台式机,8029网卡，操作系统windowme
Hub[集线器]：Tp-Link 10M，8口
. V# e2 q- A) s7 R6 E. xADSL，乙太口，非路由。
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二、网卡设置如下：
7 }3 z. E# i+ D, l在第一台机器的双网卡的接法：把ADSL接在eth0上，把eth1接在HUB上。
第一块网卡的ip设置：
ip地址:192.168.0.1
6 Q$ v) F. Y9 v# L" d2 q掩码:255.255.255.0
第二块网卡的设置
8 \0 g' B, n; m) U% {+ Tip地址:192.168.0.2
掩码：255.255.255.0
在这两块网卡中，不要设置网关。
++++++++++++++++++++++++++++++++++++++++
* R5 s5 w. F0 d4 _- a7 W第二台：Toshiba notebook的网卡设置
IP：192.168.0.6
4 |" q9 k$ b# G* A# l7 z掩码：255.255.255.0
网关：192.168.0.1
DNS:设置电信给的，或者下面的也行
$ l: f3 n8 B6 A# r0 l# \1 I202.96.134.133
202.96.168.68
++++++++++++++++++++++++++++++++++++++++
第三台机器的网卡设置
P：192.168.0.8
8 V0 g' A; ^2 Q+ E% H掩码：255.255.255.0
网关：192.168.0.1
! |% u7 j; d6 N6 q  v/ V/ bDNS:设置电信给的，或者下面的也行
% ]! q" a9 D2 J4 k# Y* k202.96.134.133
! E( k  J# P% D  B202.96.168.68
三、设置ppp拔号，
1]删除原来的ppp的ADSL链接。
$ x1 x: _1 E7 [7 R) L, a如果redhat-config-network原来已经用 redhat-config-network设置的ppp的ADSL连接拔号，用下面的命令调用删除。
#redhat-config-network

2]在终端上以root权限运行
#adsl-setup
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3 p- z: c9 |1 L4 r[root@LinuxSir02 root]# adsl-setup
! O  r$ c/ M7 \
* Q7 z# ^7 X" r$ F3 kWelcome to the ADSL client setup. First, I will run some checks on
your system to make sure the PPPoE client is installed properly...
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7 a4 k3 j$ f2 s. b& dLOGIN NAME
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Enter your Login Name (default root): ADSL提供商给的用户名，写在这里

2 A4 V* S2 C2 ^( j2 T: B5 oINTERFACE
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& E* j5 l3 {/ v9 i" \7 [Enter the Ethernet interface connected to the ADSL modem
/ H) K3 O5 T! r' c+ ^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这是ADSL通过第一台机器的第一张网卡eth0提供上网

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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
- A; f* z1 ^5 v' T* ]5 u1 O# ]after which the link should be dropped. If you want the link to
stay up permanently, enter 'no' (two letters, lower-case.)
( T# l* H! |7 h' l* A" \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):在这里按一下回车就行了。

, Q: K7 i: g/ m! _) W, PDNS

Please enter the IP address of your ISP's 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.
* T. z7 |+ ^! Q1 ]Enter the DNS information here: 202.96.134.133这是DSN，最好用你本地电信给的
Please enter the IP address of your ISP's secondary DNS server.
" E" Y4 H) N  X" L2 Y; rIf you just press enter, I will assume there is only one DNS server.
Enter the secondary DNS server address here: 202.96.168.68这是第二个DNS，也是电信给的。
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& B) E3 R2 c6 i5 a" z8 X8 jPASSWORD
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Please enter your Password:在这里把ADSL提供商给的密码写上
8 Z" b" C2 p  P) y* aPlease re-enter your Password:
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USERCTRL

Please enter 'yes' (two letters, lower-case.) if you want to allow
( s. N: v1 t9 T: Rnormal user to start or stop DSL connection (default yes): yes
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FIREWALLING

) O$ R/ A" S2 ?7 w/ G1 Z- i! K* I8 uPlease 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
9 x9 W7 y9 N: A! r! H/ l! ^are running any servers on your machine, you must choose 'NONE' and
/ d5 l6 ?9 M* R7 n0 o" Z! u. \5 sset up firewalling yourself. Otherwise, the firewall rules will deny
7 ?3 {' c, p" j; f  k! w6 laccess 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.

8 H1 A  h3 t& O) `) QThe 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.
. ]8 R6 L3 ^; [3 ~3 @" C3 Q1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation
2 - MASQUERADE: Appropriate for a machine acting as an Internet gateway
' V$ D; v+ t$ R( [2 `, U/ g& P+ B' \$ xfor a LAN
( i0 ^" R5 W( e0 S  j+ ZChoose a type of firewall (0-2): 2

2 l# C$ S; Y- x1 GStart this connection at boot time
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8 t; D% z9 ~4 ADo you want to start this connection at boot time?
5 N! a% W" b$ y& L0 v: h8 t, B4 u; aPlease enter no or yes (default no):yes

/ L/ L. J1 o* s  H- x/ m# d9 K** Summary of what you entered **

Ethernet Interface: eth0
" c/ y5 D% B7 y; NUser name: ADSL用户名
Activate-on-demand: No
6 X" A, u) w' ?8 e: mPrimary 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
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+ u- x' O  V& K& _, E三、在/etc/rc.d/rc.local中加入如下：

echo 1 > /proc/sys/net/ipv4/ip_forward
1 g1 [+ h4 z! {( }4 B6 L5 X$ G( Miptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o ppp0 -j MASQUERADE

四、重新启动机器。就OK了。这有多简单