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一、操作环境：
' S' |$ G  L  C7 u# s
0 S  S8 O% D3 U5 C机器系统与配置：三台机器的关健部件
- L5 H& R; z1 t第一台：台式机，双网卡，8139和8029，操作系统RedHat 8.0
$ E5 q& u, Y1 ^% r! C1 l" w, D* @% B% ?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
" O+ `7 C, P3 Y) r) @3 NHub[集线器]：Tp-Link 10M，8口
ADSL，乙太口，非路由。

9 S9 I* W0 K0 E6 f/ G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。
2 T- M- R  n6 {7 S7 N0 U第一块网卡的ip设置：
/ |- U* X+ X$ e6 a# B9 vip地址:192.168.0.1
掩码:255.255.255.0
8 z- ?) i6 t0 Y0 ~5 T! `第二块网卡的设置
0 s0 `6 L! a+ ]+ M( Z* D. A6 ^3 Hip地址:192.168.0.2
掩码：255.255.255.0
, i# T9 W8 G8 k, W& \& p" w0 B( T在这两块网卡中，不要设置网关。
$ k( @0 Z7 i9 f' G  I++++++++++++++++++++++++++++++++++++++++
第二台：Toshiba notebook的网卡设置
  g4 V# k# d* M* d/ N8 ZIP：192.168.0.6
掩码：255.255.255.0
& d8 D$ T6 D' V网关：192.168.0.1
DNS:设置电信给的，或者下面的也行
3 S/ e9 `. R0 @- D+ }202.96.134.133
202.96.168.68
, M+ F* P& D% c* H6 a++++++++++++++++++++++++++++++++++++++++
# Y3 t0 t1 x, t) A, J% G第三台机器的网卡设置
P：192.168.0.8
掩码：255.255.255.0
9 g, K* V$ m& U* O# i网关：192.168.0.1
DNS:设置电信给的，或者下面的也行
202.96.134.133
202.96.168.68
三、设置ppp拔号，
) E5 b8 k3 E& d1 _1]删除原来的ppp的ADSL链接。
5 c. R  A7 P! i7 m" D  d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
# g; ]3 o+ L" \2 g4 r. F  C$ ]
2]在终端上以root权限运行
#adsl-setup
# B) _6 K) C7 G* O/ }* a

0 N9 m* `  k( H[root@LinuxSir02 root]# adsl-setup

9 i: {& N) ]2 A; J7 O, x0 YWelcome to the ADSL client setup. First, I will run some checks on
; g7 ~) y. E' Tyour system to make sure the PPPoE client is installed properly...


2 s# M/ b1 P4 Z" z/ v# jLOGIN NAME

" F9 C8 k; O8 u' n! {: y2 HEnter your Login Name (default root): ADSL提供商给的用户名，写在这里

INTERFACE

Enter the Ethernet interface connected to the ADSL modem
; `+ G8 A! O6 r1 jFor Solaris, this is likely to be something like /dev/hme0.
For Linux, it will be ethX, where 'X' is a number.
5 m( V5 k7 p, ^" V- w- O7 H(default eth0): eth0这是ADSL通过第一台机器的第一张网卡eth0提供上网


- r. C6 N2 l: I( A3 T; cDo 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
! q1 G, S7 u3 M2 C0 i2 E1 Nafter which the link should be dropped. If you want the link to
1 _6 X& M; P( c' a, k/ j$ sstay up permanently, enter 'no' (two letters, lower-case.)
NOTE: Demand-activated links do not interact well with dynamic IP
' x  q8 [- R* I( x, Iaddresses. You may have some problems with demand-activated links.
7 q& J  p3 f( A) j5 ^Enter the demand value (default no):在这里按一下回车就行了。
2 c2 Z+ `- d- r, m% u( G
DNS
1 i+ H- U% r9 }
$ S3 j/ ^- b3 P/ t) E" E/ ?Please enter the IP address of your ISP's primary DNS server.
/ @% m2 o  [. m8 f5 i; C* q% e: U7 \If your ISP claims that 'the server will provide dynamic DNS addresses',
enter 'server' (all lower-case) here.
  [8 h1 F1 _( _9 x! qIf you just press enter, I will assume you know what you are
doing and not modify your DNS setup.
! j) X8 ?+ S, \: f, JEnter 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.
# [: D0 R/ b* k3 F- ~& PIf 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。
2 o" v- n- \" B5 s% [$ T- a
PASSWORD

Please enter your Password:在这里把ADSL提供商给的密码写上
Please re-enter your Password:
/ R  S& O! y2 f8 _$ F
USERCTRL

% q" T8 N" J* f! k6 \Please enter 'yes' (two letters, lower-case.) if you want to allow
normal user to start or stop DSL connection (default yes): yes

6 K" I, d8 p! Z3 `+ dFIREWALLING

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
3 W  C: A, R9 b4 t9 `$ E' vare running any servers on your machine, you must choose 'NONE' and
set up firewalling yourself. Otherwise, the firewall rules will deny
( g) G1 S: V0 R8 y+ f5 saccess to all standard servers like Web, e-mail, ftp, etc. If you
are using SSH, the rules will block outgoing SSH connections which
3 o; t! ?; Q# d; Q+ ]6 Mallocate a privileged source port.

- s7 F) U* c' v5 k$ b0 Z' ~" N0 Y& ^) xThe firewall choices are:
, a; A, V9 A1 W# j0 - NONE: This script will not set any firewall rules. You are responsible
: M4 ^# o6 [6 q. `0 e, L# w# o0 ]for ensuring the security of your machine. You are STRONGLY
0 d% }7 s5 W$ v. i  ?recommended to use some kind of firewall rules.
2 s" A" U1 M/ i, j) B( ^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
/ {# \# z8 O$ |" n' Z5 iChoose a type of firewall (0-2): 2
6 N& W. c6 Q# S) s& I0 J$ j  ?7 g
Start this connection at boot time

4 U$ Y; e8 _* Y! s7 E) E8 oDo you want to start this connection at boot time?
+ |- l' e# Y: N: W7 `1 LPlease enter no or yes (default no):yes
* w! V" X/ w+ D# ?
** Summary of what you entered **

  {! e" D1 t7 o& WEthernet Interface: eth0
3 c9 ?2 S- o0 W& eUser name: ADSL用户名
: _2 d5 x6 s0 kActivate-on-demand: No
Primary DNS: 202.96.134.133
& f+ _3 j0 J( N6 B( `' Q2 F" hSecondary DNS: 202.96.168.68
8 G0 n7 n& O7 N/ g* P% iFirewalling: MASQUERADE
  C! l, e7 W7 g2 Y' NUser Control: yes
Accept these settings and adjust configuration files (y/n)?y


三、在/etc/rc.d/rc.local中加入如下：
. f4 H3 _1 \' W( I
' R1 d; P$ u6 Hecho 1 > /proc/sys/net/ipv4/ip_forward
, i6 Y, h+ G: r* c& @" Iiptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o ppp0 -j MASQUERADE

( }4 b- b, ]- \6 E0 m四、重新启动机器。就OK了。这有多简单