Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

827 pppoe Dynamic ip with webserver

I use a Cisco 827 router with PPPoE with a dynamic ip address from the provider.Everything 's working fine, but now i would lijke to install a webserver. Therefor i have to do on portforwarding because the router is configuerd in NAT. I did everything right (i think) but i can't connect my webserver from outside.

However with an Alcatelrouter everything is working well.

Were 's my problem??

Here is my config. My webserver is


no service pad

service timestamps debug uptime

service timestamps log uptime

service password-encryption


hostname ADSL


enable secret xxxxxxxxxxx


username ADSL password xxxxxxxx

username xxxxx password xxxxxxxxxxxx

ip subnet-zero

ip name-server

ip name-server

ip dhcp excluded-address

ip dhcp excluded-address


ip dhcp pool CLIENT

import all



lease 0 2


vpdn enable


vpdn-group 1


protocol pppoe





interface Ethernet0

ip address

ip nat inside

ip tcp adjust-mss 1452

hold-queue 100 out


interface ATM0

no ip address

atm vc-per-vp 64

no atm ilmi-keepalive


pvc 8/35

pppoe-client dial-pool-number 1


dsl operating-mode auto


interface Dialer1

ip address negotiated

ip mtu 1492

ip nat outside

encapsulation ppp

ip tcp adjust-mss 1452

dialer pool 1

dialer remote-name redback

dialer-group 1

ppp authentication pap chap callin

ppp chap hostname xxxxxxxxxx

ppp chap password xxxxxxxxxxxxxxx

ppp pap sent-username xxxxxxxxxxx password xxxxxxxxxxx

ppp ipcp dns request

ppp ipcp wins request


ip nat inside source list 102 interface Dialer1 overload

ip nat inside source static tcp 80 interface Dialer1 80

ip classless

ip route Dialer1

no ip http server



access-list 23 permit

access-list 102 permit ip any

dialer-list 1 protocol ip permit


line con 0

stopbits 1

line vty 0 4

access-class 23 in

exec-timeout 120 0


length 0


scheduler max-task-time 5000



New Member

Re: 827 pppoe Dynamic ip with webserver

Your config looks fine from what I can see, but here's a couple of things to try.

First, try adding the key word extendable to the static line, ie:

ip nat inside source static tcp 80 interface Dialer1 80 extendable

The only other thing I can think of is if you had added your static translation to the config and didn't reload the router or do a clear ip nat trans * after making the change. This could cause it not to work because the Dialer1 overload translation would still be in effect for your web server.

Hope it helps -


New Member

Re: 827 pppoe Dynamic ip with webserver

Hi Bob,

I tryd to add the "extendable" at the end of the static command line but it i recieved an invalid input at the word extendable.

The second thing you was no succes either.

I took a look on the site and found an example of a config but it looks the same as the one i 'm using.

Still any suggestions.