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I am trying toget a Cisco 877 router working on my Demon B'band connection.
The Broadband works when I use a BT Voyager 220V so I know the service
itself is OK. The configuration on the router works quite happily when
attached to a standard BT B'band connection at another site.

The ATM0 link comes up and then drops a few moments later. The CD led lights
up followed by a limited amount of activity on both RXD and TXD leds and
then the whole cycle appears to repeat itself,

I am not au fait with debugging as ar as the adsl link goes.

Can anyone help/advise.

Many Thanks,


Config is shown below


version 12.4

no service pad

service timestamps debug uptime

service timestamps log uptime

service password-encryption

!

hostname nnnnnnnn

!

boot-start-marker

boot-end-marker

!

logging buffered 40960 debugging

enable password password

!

no aaa new-model

!

resource policy

!

ip subnet-zero

ip cef

!

interface ATM0

no ip address

no atm ilmi-keepalive

pvc 0/38

encapsulation aal5mux ppp dialer

dialer pool-member 1

!

dsl operating-mode auto

!

interface FastEthernet0

!

interface FastEthernet1

!

interface FastEthernet2

!

interface FastEthernet3

!

interface Vlan1

description #Connection to Home LAN#

ip address 192.168.n.n 255.255.255.0

ip nat inside

ip virtual-reassembly

ip tcp adjust-mss 1452

!

interface Dialer1

ip address negotiated

ip nat outside

ip virtual-reassembly

encapsulation ppp

dialer pool 1

ppp chap hostname

ppp chap password nnnnnnnn

!

ip classless

ip route 0.0.0.0 0.0.0.0 Dialer1

!

no ip http server

no ip http secure-server

ip nat inside source list 1 interface Dialer1 overload

!

access-list 1 permit 192.168.0.0 0.0.0.255

!

control-plane

!

line con 0

no modem enable

line aux 0

line vty 0

password nnnnnnn

login

line vty 1 4

login

!

scheduler max-task-time 5000

end

On 29 Mar, 23:06, "Colin Heseltine" <c...@ntuk.net> wrote:
> I am trying toget a Cisco 877 router working on my Demon B'band connection.
> The Broadband works when I use a BT Voyager 220V so I know the service
> itself is OK. The configuration on the router works quite happily when
> attached to a standard BT B'band connection at another site.
>
> The ATM0 link comes up and then drops a few moments later. The CD led lights
> up followed by a limited amount of activity on both RXD and TXD leds and
> then the whole cycle appears to repeat itself,
>
> I am not au fait with debugging as ar as the adsl link goes.
> interface ATM0
> no ip address
> no atm ilmi-keepalive
> pvc 0/38
> encapsulation aal5mux ppp dialer
> dialer pool-member 1
> dsl operating-mode auto

On 877 I have seen various DSL issues (but not
your one). Worth trying

int atm 0
dsl operating-mode {all possibilities one by one}
! There are only a few

Worth an IOS software upgrade too if you have
support.

Otherwise you may consider:-
DSL firmware can be downloaded from
ftp://ftp.cisco.com/pub/access/800/
Don't worry too much where it says
the firmware release only supports
a particular IOS - give it a try anyway.

Colin Heseltine wrote:
> I am trying toget a Cisco 877 router working on my Demon B'band connection.
> The Broadband works when I use a BT Voyager 220V so I know the service
> itself is OK. The configuration on the router works quite happily when
> attached to a standard BT B'band connection at another site.
>
> The ATM0 link comes up and then drops a few moments later. The CD led lights
> up followed by a limited amount of activity on both RXD and TXD leds and
> then the whole cycle appears to repeat itself,
>
> I am not au fait with debugging as ar as the adsl link goes.

Neither am I but this might help, if you haven't already read it.
<http://www.cisco.com/en/US/tech/tk175/tk15/technologies_configuration_example09186a008071a8da .shtml>

>
>
> Config is shown below
>
....
>
> interface ATM0
> no ip address
> no atm ilmi-keepalive
> pvc 0/38
> encapsulation aal5mux ppp dialer
> dialer pool-member 1
> !
> dsl operating-mode auto
> !
....
> !
> interface Dialer1
> ip address negotiated
> ip nat outside
> ip virtual-reassembly
> encapsulation ppp
> dialer pool 1
> ppp chap hostname
> ppp chap password nnnnnnnn
> !
> ip classless
> ip route 0.0.0.0 0.0.0.0 Dialer1

I'm not using Demon but my 877 has a slightly different configuration. I
have an ATM0.1 (sub) interface. I'd guess it isn't a significant
difference but you might try it

interface ATM0
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
ip route-cache flow
no atm ilmi-keepalive
dsl operating-mode auto
!
interface ATM0.1 point-to-point
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
!

....

interface Dialer0
ip address negotiated
ip access-group 101 in
no ip redirects
no ip unreachables
no ip proxy-arp
ip inspect DEFAULT100 out
ip nat outside
ip virtual-reassembly
encapsulation ppp
ip route-cache flow
dialer pool 1
dialer-group 1
no cdp enable
ppp authentication chap callin
ppp chap hostname xxxxxxxxxxxxxxxx
ppp chap password 7 xxxxxxxxxxxxxxxxxxxx
!

You'd obviously need to prune out the ACL references.
The only other significant difference might be the omission of the 'ppp
authentication chap callin' line?

You could also try saving your current config somewhere safe (e.g. TFTP
server) and using SDM to generate a new config.

Caveat: I'm new to Cisco and not an expert.