fedora15用联通pppoe无法拨号上网？求助？？

我的笔记本网卡配置如下：
[root@tangkunyin ~]# ifconfig -a
eth0 Link encap:Ethernet HWaddr 70:71:BC:95:9B:15
inet6 addr: fe80::7271:bcff:fe95:9b15/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5 errors:0 dropped:5 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:1
collisions:0 txqueuelen:1000
RX bytes:300 (300.0 b) TX bytes:648 (648.0 b)
Interrupt:45

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:208 errors:0 dropped:0 overruns:0 frame:0
TX packets:208 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:16168 (15.7 KiB) TX bytes:16168 (15.7 KiB)

virbr0 Link encap:Ethernet HWaddr 52:43:C8:60:96:E0
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:11 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:3855 (3.7 KiB)

wlan0 Link encap:Ethernet HWaddr D8:5D:4C:CB:BD:7F
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
在windows7下用pppoe就能拨号上网，但是linux下就不行了：
[root@tangkunyin ~]# cd /sbin
[root@tangkunyin sbin]# adls-setup
bash: adls-setup: command not found...
[root@tangkunyin sbin]# pppoe-setup
Welcome to the PPPoE 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): 02901105261

INTERFACE

Enter the Ethernet interface connected to the PPPoE 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): eth0

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): 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): 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): 2

Start this connection at boot time

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

** Summary of what you entered **

Ethernet Interface: eth0
User name: 02901105261
Activate-on-demand: No
DNS addresses: Supplied by ISP's server
Firewalling: MASQUERADE
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/pppoe-status /etc/sysconfig/network-scripts/ifcfg-ppp0'
to see the link status.

[root@tangkunyin sbin]# pppoe-connect
/etc/ppp/firewall-masq: line 64: /proc/sys/net/ipv4/conf/ppp0/rp_filter: No such file or directory
RTNETLINK answers: No such process
RTNETLINK answers: No such process
Using interface ppp0
Connect: ppp0 <--> /dev/pts/1
CHAP authentication failed: CHAP authentication failure, unit 6493
CHAP authentication failed
Modem hangup
Connection terminated.
RTNETLINK answers: No such process
Using interface ppp0
Connect: ppp0 <--> /dev/pts/1
CHAP authentication failed: CHAP authentication failure, unit 6491
CHAP authentication failed
Connection terminated.
tcflush failed: Input/output error
RTNETLINK answers: No such process
Using interface ppp0
Connect: ppp0 <--> /dev/pts/1
CHAP authentication failed: CHAP authentication failure, unit 6489
CHAP authentication failed
Modem hangup
Connection terminated.
RTNETLINK answers: No such process
Using interface ppp0
Connect: ppp0 <--> /dev/pts/1
CHAP authentication failed: CHAP authentication failure, unit 6487
CHAP authentication failed
Modem hangup
Connection terminated.
RTNETLINK answers: No such process
^C
[root@tangkunyin sbin]# ifup ppp0
/usr/sbin/adsl-start: line 217: 27278 Terminated $CONNECT "$@" > /dev/null 2>&1
RTNETLINK answers: No such process
总是出现上面的代码！！！！！！？？我是linux新手，请大家帮帮忙？看看这是怎么解决的？？
小弟感激不尽！！！！