三步搞定CentOS下ADSL拨号上网

  三步搞定Linux下ADSL拨号上网：
1，准备
   拨号软件和USB猫ADSL的驱动（下面附件中）

2，安装
   2.1 安装拨号软件，解压后有三个rpm包，
[root@localhost adsl]$ ls *.rpm
linux-atm-2.5.0-1.20050118cvs.i386.rpm
linux-atm-libs-2.5.0-1.20050118cvs.i386.rpm
linux-atm-libs-devel-2.5.0-1.20050118cvs.i386.rpm
[root@localhost adsl]$ rpm -ivh *.rpm
warning: linux-atm-2.5.0-1.20050118cvs.i386.rpm: Header V3 DSA signature: NOKEY, key ID 4f2a6fd2
Preparing...     ########################################### [100%]
  1:linux-atm-libs########################################### [ 33%]
  2:linux-atm    ########################################### [ 67%]
  3:linux-atm-libs-devel   ########################################### [100%]
   装完之后会有
[root@localhost ~]# br2684ctl
usage: br2684ctl [-b] [[-c number] [-e 0|1] [-s sndbuf] [-q qos] [-a [itf.]vpi.vci]*]*

   2.2 安装adsl驱动： 拷贝cxacru-fw.bin到/lib/firmware文件夹。
[root@localhost tmp]# cp cxacru-fw.bin /lib/firmware
   注：如果在后面的操作中拨号不成功，很可能是这里拷贝的驱动不符合机器的实际情况，那就需要从新编译：
[root@localhost tmp]# ./cxacru-fw CnxEtU.sys cxacru-fw.bin
[root@localhost tmp]# cp cxacru-fw.bin /lib/firmware

3，拨号

[root@localhost ~]# br2684ctl -b -c 0 -a 8.35 (注：这里的8.35是根据USB猫的实际型号来的)
br2684ctl[2930]: Interface "nas0" created sucessfully
br2684ctl[2930]: Communicating over ATM 0.8.35, encapsulation: LLC
br2684ctl[2930]: Interface configured
[root@localhost ~]# ifconfig
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:1759 errors:0 dropped:0 overruns:0 frame.:0
          TX packets:1759 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2706048 (2.5 MiB)  TX bytes:2706048 (2.5 MiB)

[root@localhost ~]# ifconfig nas0 up
[root@localhost ~]# adsl-setup

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): *****@adsla

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 ethX, where 'X' is a number.
(default eth0): nas0

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):

DNS

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.
Enter the DNS information here: server

PASSWORD

Please enter your Password:
Please re-enter your Password:

USERCTRL

Please enter 'yes' (three letters, lower-case.) if you want to allow
normal user to start or stop DSL connection (default yes):

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): 1

Start this connection at boot time

Do you want to start this connection at boot time?
Please enter no or yes (default no):

** Summary of what you entered **

Ethernet Interface: nas0
User name:          ******@adsla
Activate-on-demand: No
DNS addresses:      Supplied by ISP's server
Firewalling:        STANDALONE
User Control:       yes
Accept these settings and adjust configuration files (y/n)? y
Adjusting /etc/sysconfig/network-scripts/ifcfg-ppp0
Adjusting /etc/ppp/chap-secrets and /etc/ppp/pap-secrets
  (But first backing it up to /etc/ppp/chap-secrets.bak)
  (But first backing it up to /etc/ppp/pap-secrets.bak)



Congratulations, it should be all set up!

Type '/sbin/ifup ppp0' to bring up your xDSL link and '/sbin/ifdown ppp0'
to bring it down.
Type '/sbin/adsl-status /etc/sysconfig/network-scripts/ifcfg-ppp0'
to see the link status.

[root@localhost ~]# /sbin/ifup ppp0
[root@localhost ~]# ifconfig
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:1759 errors:0 dropped:0 overruns:0 frame.:0
          TX packets:1759 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2706048 (2.5 MiB)  TX bytes:2706048 (2.5 MiB)

nas0      Link encap:Ethernet  HWaddr 00:D0:F8:6E:FE:48
          inet6 addr: fe80::2d0:f8ff:fe6e:fe48/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0 frame.:0
          TX packets:27 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:428 (428.0 b)  TX bytes:4987 (4.8 KiB)

ppp0      Link encap:Point-to-Point Protocol
          inet addr:221.215.250.49  P-t-P:221.215.250.1  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1
          RX packets:3 errors:0 dropped:0 overruns:0 frame.:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:54 (54.0 b)  TX bytes:54 (54.0 b)

[root@localhost ~]# ping www.google.cn
PING cn.l.google.com (59.151.21.100) 56(84) bytes of data.
64 bytes from 59.151.21.100: icmp_seq=1 ttl=237 time=78.4 ms
64 bytes from 59.151.21.100: icmp_seq=2 ttl=237 time=81.8 ms
64 bytes from 59.151.21.100: icmp_seq=3 ttl=237 time=80.5 ms
64 bytes from 59.151.21.100: icmp_seq=4 ttl=237 time=78.8 ms
64 bytes from 59.151.21.100: icmp_seq=5 ttl=237 time=78.7 ms
64 bytes from 59.151.21.100: icmp_seq=6 ttl=237 time=79.7 ms

--- cn.l.google.com ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5038ms
rtt min/avg/max/mdev = 78.498/79.709/81.835/1.193 ms
[root@localhost ~]# dmesg |grep ATM
ATM dev 0: ADSL line: attempting to activate
ATM dev 0: ADSL line: channel analysis
ATM dev 0: ADSL line: up (2048 kb/s down | 512 kb/s up)


安装完毕，拨号成功，这样平时只要用如下脚本拨号即可：
#! /bin/bash
sudo /usr/sbin/br2684ctl -b -c 0 -a 8.35
sudo /sbin/ifconfig nas0 up
sudo /sbin/ifup ppp0

最近联通adsl设置有变，但具体对linux下驱动还没有多少影响（http://www.qd.sd.cn/temp/adsl1/neiye.html），主要是修改了PPPOA封装模式（PPP ORER ATM VCMUX RFC2364）到PPPOE模式(PPP over Ethernet LLCSNAP  RFC2516 )。

 

谢谢大家的下载，以上均在CentOS 5.X 里测试通过。