slackware作网关，代理家庭用户上网

# /etc/rc.d/rc.inet1.conf
#
# This file contains the configuration settings for network interfaces.
# If USE_DHCP[interface] is set to “yes”, this overrides any other settings.
# If you don’t have an interface, leave the settings null ("").

# Config information for eth0:
IPADDR[0]="192.168.0.254″
NETMASK[0]="255.255.255.0″
USE_DHCP[0]="”
DHCP_HOSTNAME[0]="”

# Config information for eth1:
IPADDR[1]="”
NETMASK[1]="”
USE_DHCP[1]="”
DHCP_HOSTNAME[1]="”

# Config information for eth2:
IPADDR[2]="”
NETMASK[2]="”
USE_DHCP[2]="”
DHCP_HOSTNAME[2]="”

# Config information for eth3:
IPADDR[3]="”
NETMASK[3]="”
USE_DHCP[3]="”
DHCP_HOSTNAME[3]="”

# Default gateway IP address:
GATEWAY="192.168.0.254″
下面内容省略

Welcome to the Roaring Penguin ADSL client setup.  First, I will run
some checks on your system to make sure the PPPoE client is installed
properly…

Looks good!  Now, please enter some information:

USER NAME

>>> Enter your PPPoE user name (default bxxxnxnx@sympatico.ca): adslusername

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 ethn, where ‘n’ is a number.
(default eth0): eth1

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):输入回车

DNS

Please enter the IP address of your ISP’s primary DNS server.
If your ISP claims that ‘the server will provide 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: server

PASSWORD

>>> Please enter your PPPoE password:输入密码
>>> Please re-enter your PPPoE password:输入密码

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): 0

** Summary of what you entered **

Ethernet Interface: eth1
User name:          adslusername
Activate-on-demand: No
DNS addresses:      Supplied by ISP’s server
Firewalling:        NONE

>>> Accept these settings and adjust configuration files (y/n)? y
Adjusting /etc/ppp/pppoe.conf
Adjusting /etc/ppp/pap-secrets and /etc/ppp/chap-secrets
  (But first backing it up to /etc/ppp/pap-secrets-bak)
  (But first backing it up to /etc/ppp/chap-secrets-bak)

Congratulations, it should be all set up!

Type ‘adsl-start’ to bring up your ADSL link and ‘adsl-stop’ to bring
it down.  Type ‘adsl-status’ to see the link status.

adsl-start

#设置nat转换
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE

#设置内网机器可以使用FTP
modprobe ip_conntrack
modprobe ip_conntrack_ftp
modprobe ip_nat_ftp