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一、操作环境：

  z9 d4 k) E* _' ]机器系统与配置：三台机器的关健部件
( A% l/ i& _" ^- ]% \2 Y第一台：台式机，双网卡，8139和8029，操作系统RedHat 8.0
. z1 f8 Y8 T. J  ~/ d5 i, g第二台：Toshiba notebook，PC卡。RTL-8139/8139C/8139C+，操作系统RedHat 8.0
第三台：台式机,8029网卡，操作系统windowme
Hub[集线器]：Tp-Link 10M，8口
9 I: ?) n( l* o! V. GADSL，乙太口，非路由。

) Q/ n' n" Y# S* f( H5 A' G# P! |3 H二、网卡设置如下：
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
掩码:255.255.255.0
( ?) T) z( J: ~' u* \& ]第二块网卡的设置
2 E; V) U3 t% D# e: u' A: i, Rip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。
++++++++++++++++++++++++++++++++++++++++
第二台：Toshiba notebook的网卡设置
+ S7 b" F; Z# X! g( Z9 TIP：192.168.0.6
掩码：255.255.255.0
4 @6 b/ ?/ j1 f/ v: s/ l( S网关：192.168.0.1
DNS:设置电信给的，或者下面的也行
; H2 T7 ^7 ^5 t- B3 P, [202.96.134.133
202.96.168.68
++++++++++++++++++++++++++++++++++++++++
第三台机器的网卡设置
- p2 v2 a& \0 t, f$ t0 Y: PP：192.168.0.8
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
/ }0 I, L7 O7 Y8 L+ ]0 i) {202.96.134.133
1 G9 ~+ E9 V) y0 V1 H# x0 K202.96.168.68
) }5 M: N3 q6 z7 Y6 u7 K6 o三、设置ppp拔号，
1]删除原来的ppp的ADSL链接。
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。
& n, o9 |# k& r0 j+ c#redhat-config-network

2]在终端上以root权限运行
+ I6 }1 X: @7 b. G) p#adsl-setup

8 g+ q& W  x4 G3 b/ W4 D
[root@LinuxSir02 root]# adsl-setup

6 H; u. Q# e1 O" I& T! DWelcome 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
6 d0 r+ I# s3 N& j' I" @: M
Enter your Login Name (default root): ADSL提供商给的用户名，写在这里

INTERFACE

! k4 t5 h7 H% C( o% eEnter the Ethernet interface connected to the ADSL modem
For Solaris, this is likely to be something like /dev/hme0.
/ \, I" U9 j- {# OFor 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

" b; p& j; Y+ C! _2 i% I
+ w. J/ B5 N( J7 x) x, S, vDo 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
: x9 V; G+ L4 z8 Hafter which the link should be dropped. If you want the link to
. p8 P- ?" B  ^( ~stay up permanently, enter 'no' (two letters, lower-case.)
% A: x, G1 z- i9 VNOTE: Demand-activated links do not interact well with dynamic IP
' _* d7 r# Y* F- n5 Gaddresses. You may have some problems with demand-activated links.
; N+ Q0 E0 l" C; u* H+ W- |Enter the demand value (default no):在这里按一下回车就行了。

) }- ~) V; Z+ r( o) o5 C% b0 j6 ~DNS
' Q6 Y8 X5 v. q4 L# N% o6 U3 g
  ^0 C: u! A$ }: pPlease enter the IP address of your ISP's primary DNS server.
If your ISP claims that 'the server will provide dynamic DNS addresses',
$ O7 L4 B6 u1 y2 F. o1 ienter 'server' (all lower-case) here.
If you just press enter, I will assume you know what you are
. _8 k) {/ _1 W/ }7 ddoing and not modify your DNS setup.
Enter the DNS information here: 202.96.134.133这是DSN，最好用你本地电信给的
! N9 y" p! `+ u' Y6 S! ^! oPlease enter the IP address of your ISP's 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这是第二个DNS，也是电信给的。
/ U7 @0 w$ x5 h9 l* F& Y
0 @. X: K- i6 F7 O8 C8 a# x! @PASSWORD
6 [2 M& k# N* w5 y7 q. ^6 W
: g, P* P* b0 O- r* YPlease enter your Password:在这里把ADSL提供商给的密码写上
Please re-enter your Password:
, d; ]( |, d% ?; @
$ B. N7 S8 T2 x5 R0 {4 U6 kUSERCTRL

Please enter 'yes' (two letters, lower-case.) if you want to allow
) y  Z+ Q$ I" I& y" T4 f( c7 Enormal user to start or stop DSL connection (default yes): yes
: G8 F/ M9 T/ i) M/ z) F# \' T  F
2 `* O& s3 u% `  \7 i9 lFIREWALLING
& _) F+ l7 K& ?3 \" A
. Z' j! j! ]) hPlease 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
4 V/ E6 N; H9 Cset 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.
0 r4 t* N; p% e2 p+ i
1 l8 ]: y; I8 E! QThe firewall choices are:
, [  u9 E; X% a2 T0 - NONE: This script will not set any firewall rules. You are responsible
; N9 P+ p: L, R, q7 U+ nfor ensuring the security of your machine. You are STRONGLY
7 s& S0 x3 s# j: q1 lrecommended to use some kind of firewall rules.
% T# _$ ?- d2 c' k4 G1 I1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation
; C) w  m6 J3 z- D. u& u0 o& W7 t4 ~2 - MASQUERADE: Appropriate for a machine acting as an Internet gateway
for a LAN
Choose a type of firewall (0-2): 2

* F( p) T; c- ~! O# `Start this connection at boot time
7 e* y5 e2 d8 B$ p* S2 K9 H
  @5 z( {4 r1 o4 nDo you want to start this connection at boot time?
Please enter no or yes (default no):yes

# v, B9 w! e% l0 B** Summary of what you entered **
8 ?2 r$ ?1 d8 L
Ethernet Interface: eth0
7 P: z  L0 s3 V7 [& t  sUser name: ADSL用户名
Activate-on-demand: No
Primary DNS: 202.96.134.133
Secondary DNS: 202.96.168.68
Firewalling: MASQUERADE
) U- I9 D/ k6 m& MUser Control: yes
9 x! M0 g8 D: Y  U8 A" YAccept these settings and adjust configuration files (y/n)?y
/ T/ u+ L5 }- J4 L3 U

& U; U" G6 w7 O- {/ [4 x三、在/etc/rc.d/rc.local中加入如下：

3 e7 R! I+ r  P, d, ]1 P; Lecho 1 > /proc/sys/net/ipv4/ip_forward
: q. I. A) _% A8 N+ biptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o ppp0 -j MASQUERADE

- K7 x6 [9 W" F9 S$ }四、重新启动机器。就OK了。这有多简单