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

ADSL Connection dropping regularly

hi Guys

Ive got a 1721 configured at home on the end of my ADSL line.

I think Ive got it configured ok, but for some reason it drops the DSL connection at least once every hour.

Its doing my head in! Ive tried everything i can think of, but still it drops.

Could it be a faulty WIC?

Heres my config:


version 12.3

service config

service timestamps debug datetime msec

service timestamps log datetime msec

service password-encryption


hostname Router





no logging buffered

enable secret ********************


no aaa new-model


resource policy


mmi polling-interval 60

no mmi auto-configure

no mmi pvc

mmi snmp-timeout 180

ip subnet-zero

ip cef



no ip dhcp use vrf connected

ip dhcp excluded-address


ip dhcp pool HOME

import all



dns-server **************** ****************

lease infinite



no ip ips deny-action ips-interface

ip name-server 212.x.x.7

ip name-server 212.x.x.10


no ftp-server write-enable



interface ATM0

description ADSL line interface

no ip address

no atm ilmi-keepalive

dsl operating-mode auto

pvc 0/38

encapsulation aal5mux ppp dialer

dialer pool-member 1



interface Ethernet0

no ip address



interface FastEthernet0

description LAN

ip address

ip access-group 101 in

ip nat inside

ip virtual-reassembly

speed auto

no cdp enable


interface Dialer1

description Connection to ADSL

ip address ***********

ip access-group 102 in

ip nat outside

ip virtual-reassembly

encapsulation ppp

dialer pool 1

dialer idle-timeout 0

dialer-group 1

no cdp enable

ppp authentication pap chap callin

ppp chap hostname ****************

ppp chap password ****************

ppp pap sent-username **************** password ****************


ip classless

ip route Dialer1


ip http server

ip http authentication local

ip http secure-server

ip nat inside source list 101 interface Dialer1 overload

ip nat inside source static tcp 3389 3389 extendable

ip nat inside source static tcp 29310 29310 extendable

ip nat inside source static udp 29310 29310 extendable


access-list 100 deny ip any any

access-list 101 permit ip any




line con 0

exec-timeout 0 0

password ****************


line aux 0

line vty 0 4

privilege level 15

password ****************

login local

transport input telnet ssh




Re: ADSL Connection dropping regularly

Kindly do a bebug of the ATM interface

Disconnecting the 'ring' wire in the phone socket may help sometime. It can be result from some important misconfiguration in your own network.

If you want to know more please click Below URL:

Community Member

Re: ADSL Connection dropping regularly

Thanks for your reply.

I am getting this in my logs:

ILMI(ATM0): Sending ilmiColdStart trap

ILMI(ATM0): No ILMI VC found

ILMI: Encapsulation error on o/g ILMI Pdu


Unable to Send Pdu out

CreatePlease to create content