Unable establish ADSL connection with Cisco 837 router

Unanswered Question
Jun 15th, 2010

Im not having much luck confiruing my 837 ADSL router. The router get a dynamic IP from ISP.

Below is my configs, appreciate if some one can give me some tips:

hostname Router1
ip subnet-zero
no ip routing
no ip domain lookup
ip domain name cisco.com
interface Ethernet0
description Connect to internal network
ip address
no ip route-cache
hold-queue 100 out
interface ATM0
no ip address
no ip route-cache
no atm ilmi-keepalive
pvc 8/35
  encapsulation aal5snap
dialer pool 1
dialer-group 1
ppp authentication chap callin
ppp chap hostname <removed>
ppp chap password <removed>
ppp ipcp dns request
ip nat inside source list 1 interface Dialer0 overload
ip classless
ip route
ip http server
no ip http secure-server
access-list 1 permit any
dialer-list 1 protocol ip permit

Router1#show ip interface
ATM0 is down, line protocol is down
  Internet protocol processing disabled
Dialer0 is up, line protocol is up
  Internet address will be negotiated using IPCP
Ethernet0 is up, line protocol is up

I have this problem too.
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Federico Coto F... Tue, 06/15/2010 - 06:23


Have you tested if connecting a computer directly to the ADSL if it gets an IP via DHCP?

If it works, the router should be configured to obtain DHCP address and a default route.


after1111 Tue, 06/15/2010 - 07:19

Hi Federico,

DHCP is not enable on the router.

I use this router to provide Internet connectivy over the Internet and tunneling between 2 sites.

Head quarter----tunnel through Internet-----ISP---------Cisco837 router-------cisco 2620 router.

Any ideas?

Federico Coto F... Tue, 06/15/2010 - 07:22

Are you configuring the 837 ADSL connection directly or an Ethernet interface connected to an ADSL modem?

In other words, is the ADSL modem the router?


after1111 Tue, 06/15/2010 - 08:30

Yes the adsl modem is the router. It connect tot he phone line going to the Internet,


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