Cisco 837 headache

Will the Cisco 837 work OK in the UK with BT broadband?

Mine keeps complaining that the DNS servers are invalid, even if I input them manually?


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post the IOS version in use, your current config and the entire session where you try to apply the dns server commands

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I'm not using it with BT, but I'm happily using a Cisco 837 with Eclipse Internet (which is also PPPoA).

If you don't get any joy thenI can share my config with you.



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Jim Willsher


I'm using CRWS to set the router up.

Router Model : C837

IOS Image Name : c837-k9o3y6-mz.123-4.T7.bin

IOS Version :


Current configuration : 2347 bytes


version 12.3

no service pad

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption


hostname huckle





no logging buffered

no logging console

enable secret 5 $1$ipJ5$vL/6kIhwMq/4A8vKtggWQ0

enable password hucky


username CRWS_Srini privilege 15 password 0 $1$W1fA$o1oSEpa2131764179

username CRWS_Kannan privilege 15 password 0 $1$W1fA$o1oSEpa1782032486

username CRWS_Ritesh privilege 15 password 0 $1$W1fA$o1oSEpa115430558

username CRWS_Santhosh privilege 15 password 0 $1$W1fA$o1oSEpa1694627869

no aaa new-model

ip subnet-zero

no ip routing

ip name-server

ip name-server

ip dhcp excluded-address


ip dhcp pool CLIENT

import all



lease 0 2

! !

ip audit notify log

ip audit po max-events 100

ip ssh break-string

no ftp-server write-enable

! ! !

no crypto isakmp enable

! ! ! !

interface Ethernet0

ip address

ip nat inside

no ip route-cache

ip tcp adjust-mss 1452

no ip mroute-cache

hold-queue 100 out


interface ATM0

no ip address

no ip route-cache

no ip mroute-cache

atm vc-per-vp 64

no atm ilmi-keepalive

pvc 0/38

oam-pvc 0

encapsulation aal5mux ppp dialer

dialer pool-member 1


dsl operating-mode auto


interface Dialer1

ip address negotiated

ip mtu 1458

ip nat outside

encapsulation ppp

ip tcp adjust-mss 1452

dialer pool 1

dialer remote-name redback

dialer-group 1

ppp authentication chap pap callin

ppp chap hostname

ppp chap password 0 ********

ppp pap sent-username password 0 ********

ppp ipcp dns request

ppp ipcp wins request

hold-queue 224 in


ip nat inside source list 102 interface Dialer1 overload

ip classless

ip route Dialer1

ip http server

no ip http secure-server

! !

access-list 102 permit ip any

dialer-list 1 protocol ip permit



! !

line con 0

no modem enable

transport preferred all

transport output all

line aux 0

transport preferred all

transport output all

line vty 0 4

exec-timeout 120 0

password hucky

login local

length 0

transport preferred all

transport input all

transport output all


scheduler max-task-time 5000



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Since posting this i've managed to solve the problem. I didn't have IP routing enabled. ooops!

Thanks for your help anyway

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