使用Cisco 1841拨PPPOE后出现的疑难杂症!
我在使用Cisco 1841拨PPPOE后出现下面几个疑难杂症，请问是怎么回事？下面所有的问题，我用同一台机器单独连接ADSL后，都没有出现了，排除是ADSL的问题。
另外，出现问题的页面我也用IE和Chrome测试了，问题都同样出现，也排除了是浏览器的问题。
1.登录网易邮箱后，打不开邮件，打开邮件后，本该出现邮件正文的地方是一片空白。
2.登录不了51.com
3.网段中某些PC不能登录MSN，另外一些却可以登录，不能登录MSN的错误代码是：80048820，但是经过MSN的自我修复后，MSN检测线路一切正常。
4.网段中的所有PC在QQ群发图片都不成功，发完之后群里任何人都看不到图片
5.在Discuz!论坛发不了帖子，现在我是用单独拨ADSL上来发帖的.
目前只发现这些问题，我觉得很可能是Cisco 1841的配置上出现了某些错误!请大家帮我看看
下面是Show run
Building configuration...
Current configuration : 1396 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip cef
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.1.1
!
ip dhcp pool MinBoo
network 192.168.1.0 255.255.255.0
dns-server 202.106.0.20
default-router 192.168.1.1
lease infinite
!
!
no ip domain lookup
multilink bundle-name authenticated
vpdn enable
!
vpdn-group MinBoo
request-dialin
protocol pppoe
l2tp tunnel receive-window 1024
!
!
!
archive
log config
hidekeys
!
!
!
!
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
pppoe enable
pppoe-client dial-pool-number 1
!
interface FastEthernet0/1
ip address 192.168.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly
duplex auto
speed auto
!
interface Dialer1
ip address negotiated
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication pap callin
ppp pap sent-username 400000037435 password 0 s4w8v5h8
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 Dialer1
!
!
no ip http server
ip nat inside source list 1 interface Dialer1 overload
!
access-list 1 permit 192.168.1.0 0.0.0.255
!
!
control-plane
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
login
!
scheduler allocate 20000 1000
end 贴一个SPOTO上海曾经用过的在路由器上配置PPPoE的case，网络使用情况良好。
SPOTO-C3640#show run
Building configuration...
Current configuration : 952 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname SPOTO-C3640
!
boot-start-marker
boot-end-marker
!
logging snmp-authfail
enable password cisco
!
no aaa new-model
!
!
ip cef
!
!
vpdn enable
!
vpdn-group 1
request-dialin
protocol pppoe
!
!
!
!
!
interface FastEthernet2/0
ip address 192.168.100.254 255.255.255.0
ip nat inside
ip virtual-reassembly
duplex auto
speed auto
!
interface FastEthernet3/0
no ip address
duplex auto
speed auto
pppoe enable group global
pppoe-client dial-pool-number 1
!
interface Dialer0
ip address negotiated
ip nat outside
ip mtu 1492
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
ppp pap sent-username ad19830604 password 0 SHspoto
!
ip http server
ip route 0.0.0.0 0.0.0.0 Dialer0
!
!
ip nat inside source list 1 interface Dialer0 overload
!
access-list 1 permit any
!
!
control-plane
!
!
line con 0
logging synchronous
line aux 0
line vty 0 4
password cisco
login
!
end
SPOTO-C3640# sh ip int brief
Interface IP-Address OK? Method Status Protocol
FastEthernet2/0 192.168.100.254 YES manual up up
FastEthernet3/0 unassigned YES manual up up
NVI0 unassigned NOunsetup up
Virtual-Access1 unassigned YES unsetup up
Virtual-Access2 unassigned YES unsetup up
Dialer0 116.232.164.252 YES IPCP up up
SPOTO-C3640#wr
Building configuration...
我看了看，好想就是access-list 1 permit any这个不同，我在路由器上加上了access-list 1 permit any
之后，问题依旧。
真是很奇怪！ 应该是MTU的事？把MTU 改成1492，或者1500 非常感谢楼上的朋友！就是因为没加MTU那句话！现在OK了！
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