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ADSL Gettting disconnected

saviopereira
Level 1
Level 1

i am having this problem on a cisco 837 adsl router. the dialer1 gets disconected after few minutes. when i went to diagnose the problem i found that when i remove the IP NAT INSIDE command on eth0 the dialer1 doesnt disconnect , as soon as i put IP NAT INSIDE on eth0 the router gets disconneted , i am attacthing the scripts plz see the followingversion 12.3

no service pad

service timestamps debug datetime msec

service timestamps log uptime

service password-encryption

!

hostname cops_router

!

enable password xxx

!

username cops password xxx

no aaa new-model

ip subnet-zero

!

!

ip audit notify log

ip audit po max-events 100

no ftp-server write-enable

!

!

!

!

!

!

!

interface Ethernet0

ip address 10.0.0.138 255.0.0.0

ip nat inside

hold-queue 100 out

!

interface ATM0

no ip address

no ip mroute-cache

no atm ilmi-keepalive

pvc 8/35

encapsulation aal5mux ppp dialer

dialer pool-member 1

!

dsl operating-mode auto

!

interface FastEthernet1

no ip address

duplex auto

speed auto

!

interface FastEthernet2

no ip address

duplex auto

speed auto

!

interface FastEthernet3

no ip address

duplex auto

speed auto

!

interface FastEthernet4

no ip address

duplex auto

speed auto

!

interface Dialer1

ip address negotiated

ip nat outside

encapsulation ppp

dialer pool 1

keepalive 180

ppp authentication pap callin

ppp pap sent-username xxx password xxx

!

ip nat inside source list 1 interface Dialer1 overload

ip classless

ip route 0.0.0.0 0.0.0.0 Dialer1

ip http server

no ip http secure-server

!

access-list 1 permit 10.0.0.0 0.255.255.255

dialer-list 1 protocol ip permit

!

line con 0

exec-timeout 120 0

no modem enable

stopbits 1

line aux 0

line vty 0 4

access-class 23 in

exec-timeout 120 0

password xxx

login local

!

scheduler max-task-time 5000

!

end

4 Replies 4

Hello,

there is no ´dialer-group 1´ statement on your Dialer 1 interface, not sure if that is just a typo. Also, try and remove the ´keepalive 180´ statement from your Dialer 1 interface and see if that makes a difference...

Regards,

GP

hi we have checked it still same problem

our problem is related to natting if we remove

IP NAT INSIDE it works , if we put IP NAT INSIDE it disconnects

thanks

Hello,

can you turn on debugging for NAT and post the results ?

debug ip nat

Regards,

GP

Hi Savio,

From dialer 0, remove:

ppp authentication pap callin

In global remove:

dialer-list 1 protocol ip permit

They are not required - I reckon it's the dialer-list statement confusing the nat as it's using the same ACL

Try that then, to be sure it's not authentication, deb ppp negotiation, shut the ATM interface and no shut in order to collect the debug info.

Also, I can't remember which version it was, but a couple of IOS version had a problem with eihter ip mroute-cache or route-cache. Disable both on the dialer int.

HTH

Ali