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一、操作环境：
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* @1 r7 g% O2 o* ?' z机器系统与配置：三台机器的关健部件
, S  w+ w+ E% T* X! i* M3 q! V第一台：台式机，双网卡，8139和8029，操作系统RedHat 8.0
) u# n( D3 Y  W/ m. n) h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
ADSL，乙太口，非路由。

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：
7 a8 Y: F' V3 ^4 E, w. p) Aip地址:192.168.0.1
掩码:255.255.255.0
第二块网卡的设置
ip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
IP：192.168.0.6
2 W' X( ^4 `, ?# U掩码：255.255.255.0
) s  m: l2 j# r: }( I9 _# B网关：192.168.0.1
DNS:设置电信给的，或者下面的也行
; A7 k$ B  t! }3 U; K3 ~7 o202.96.134.133
8 @5 V3 w- V0 R1 p202.96.168.68
++++++++++++++++++++++++++++++++++++++++
6 j* x8 A3 R/ O4 Y' g第三台机器的网卡设置
! v; q  d2 C3 C; H& f" f+ MP：192.168.0.8
. T- T% R  q. O0 t; \$ `$ X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
202.96.134.133
4 S1 |7 P, E" S0 n. k/ b. }202.96.168.68
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。
* w* N! R# z% K#redhat-config-network

2]在终端上以root权限运行
; t: _6 I. n. z6 j- d#adsl-setup
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. I: Y& m' V8 ~  E+ O5 \% ^[root@LinuxSir02 root]# adsl-setup
% W2 b8 `# v# a7 p
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提供商给的用户名，写在这里

INTERFACE
7 I: a  ~/ J) v' |1 v5 [
Enter the Ethernet interface connected to the ADSL modem
7 d, ?1 L1 y: w1 SFor Solaris, this is likely to be something like /dev/hme0.
For Linux, it will be ethX, where 'X' is a number.
% _& b, V0 }% p5 O0 w& b  g(default eth0): eth0这是ADSL通过第一台机器的第一张网卡eth0提供上网
1 h2 b4 n% _7 t" ~* v

! N. X; S$ D- l- A4 T2 O* g7 @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
$ s* v9 _# V+ w4 }1 R. Wafter which the link should be dropped. If you want the link to
+ U! ^4 e0 J) A# ]& dstay up permanently, enter 'no' (two letters, lower-case.)
$ Z" j0 ~3 l9 P1 M0 B0 sNOTE: Demand-activated links do not interact well with dynamic IP
1 |0 O; }3 c0 R) faddresses. 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。
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7 Q  Q# g. p. e% h4 ~DNS
# g7 _: E/ R+ E
$ `; Q8 u% Q5 \$ r& B4 G$ H! ~Please enter the IP address of your ISP's primary DNS server.
If your ISP claims that 'the server will provide dynamic DNS addresses',
( p2 [: k0 m; w4 L- A$ Y. E5 renter '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.
6 M! |# r5 W8 s* d# W+ |" zEnter the DNS information here: 202.96.134.133这是DSN，最好用你本地电信给的
# J% D! e1 O6 P2 o+ x4 g8 }Please 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。
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PASSWORD
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6 c" d) b& |8 l# G# q/ O. aPlease enter your Password:在这里把ADSL提供商给的密码写上
( Y, R) @4 |! L6 GPlease re-enter your Password:

" x+ B0 Q; e6 x* }2 L; }7 Y) N( zUSERCTRL

" T) l; n* h, f* `Please enter 'yes' (two letters, lower-case.) if you want to allow
normal user to start or stop DSL connection (default yes): yes

2 f8 z8 s! R/ k! b2 }0 O0 tFIREWALLING

! I" p' N: p9 q2 h( qPlease choose the firewall rules to use. Note that these rules are
6 t6 a5 J. m0 n( q  j, W% ]' wvery basic. You are strongly encouraged to use a more sophisticated
* }+ u8 \3 e: h; X. y' u4 Nfirewall setup; however, these will provide basic security. If you
- B, F% P$ Z* C8 B, {; w% W9 `are running any servers on your machine, you must choose 'NONE' and
# Q8 P2 X7 M4 z! t0 K. T1 Bset 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
3 Z6 y1 y/ `8 p! I# F" Q) Nallocate a privileged source port.

# R" v6 W1 w- x' ?- _The firewall choices are:
) |  k' }, L& X. Q4 S- L0 - NONE: This script will not set any firewall rules. You are responsible
for ensuring the security of your machine. You are STRONGLY
' V" ^+ ?, n. B+ Y* J& |recommended to use some kind of firewall rules.
! ]. b, B$ o2 K2 w1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation
2 - MASQUERADE: Appropriate for a machine acting as an Internet gateway
! t% U1 E" d" P( m! E' a# rfor a LAN
Choose a type of firewall (0-2): 2
" T" W  Z. ]2 m" s5 b! t  [
% Y7 i& b3 Q+ C9 m; B" d( PStart this connection at boot time

Do you want to start this connection at boot time?
; F$ p+ @( Z6 P" S% IPlease enter no or yes (default no):yes

6 G( D/ ?- q: O9 @; m** Summary of what you entered **
1 Y) G  y' O' x7 k: d
2 z7 i% v2 E% M0 bEthernet Interface: eth0
; R2 b" a% M, ~  x( [9 uUser name: ADSL用户名
Activate-on-demand: No
) F  l0 G, X" u' k8 F' A3 d6 FPrimary DNS: 202.96.134.133
6 Q$ @6 q- X% c; a3 O" QSecondary DNS: 202.96.168.68
Firewalling: MASQUERADE
User Control: yes
3 o, M0 i# n" @, p) r1 m+ a. W6 hAccept these settings and adjust configuration files (y/n)?y


三、在/etc/rc.d/rc.local中加入如下：
3 D- j  L$ [1 d* Z. y: m
( ]5 u1 E4 |  ^  T1 ^6 Z1 ~- Becho 1 > /proc/sys/net/ipv4/ip_forward
& b' I3 U9 o9 k) l3 ziptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o ppp0 -j MASQUERADE
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+ I9 m, V' |7 D) n$ B5 ]  d/ C四、重新启动机器。就OK了。这有多简单