Troubleshooting guide

In the MTU field, type 1492.5.
Click Apply to save the change, and then click Exit.6.
Reboot the PPPoE PC client.7.
The registry change is saved when the procedure finishes so you need to run the utility only once per PC.
Configuration
Tip: If you are not familiar with configuring Cisco devices and would like to follow a step−by−step
configuration, click here.
Cisco DSL Router with a Dynamic IP Address
!−−− Comments contain explanations and additional information.
service timestamps debug datetime msec
service timestamps log datetime msec
vpdn enable
no vpdn logging
vpdn−group pppoe
request−dialin
protocol pppoe
!−−− These commands are needed only on Cisco IOS Software older than 12.2(13)T.
!
!
ip subnet−zero
!
ip dhcp excluded−address <ip address of ethernet0>
ip dhcp pool <dhcp pool name>
network <ip network address of ethernet0> <subnet mask>
default−router <ip address of ethernet0>
dns−server <ip address of dns server>
!
interface ethernet0
no shut
ip address <ip address> <subnet mask>
ip tcp adjust−mss 1452
!−−− If the ip tcp adjust−mss 1452 command is not supported, try the
!−−− following configuration statement:
!−−− ip adjust−mss 1452
!−−− If this command is not supported in your current Cisco DSL Router software
!−−− release, either upgrade to the latest Cisco DSL Router software or follow the
!−−− procedure in the "Possible Required Configuration Steps on the PC"
!−−− section above.
ip nat inside
no ip directed−broadcast
!
interface atm0
no shut
no ip address
bundle−enable
dsl operating−mode auto
!
interface atm0.1 point−to−point
no ip address
no ip directed−broadcast
no atm ilmi−keepalive
pvc <vpi/vci>
pppoe−client dial−pool−number 1
!−−− Common PVC values supported by ISPs are 0/35 or 8/35.
Cisco DSL Router Configuration and Troubleshooting Guide