Simple ADSL Config

Create Share · ‎02-11-2011

Hi!

I need to configure ADSL on my 837 Router with simple configuration. The WAN IP address is dynamic from my ISP. I checked many websites and found different configurations everywhere. I don't know which is best suited for me. I used SDM and configured ADSL. When i checked the configuration from console i found that there is atm0.2 and dialer 2 configured with my settings. I cannot understand what is the purpose of atm0.2 and dialer 2 when atm0 and dialer0 are there. Can anybody give me some details about them and are they needed? Secondly, is there a doc on ADSL config on 837?

interface Ethernet0
ip tcp adjust-mss 1412
exit
interface ATM0.2 point-to-point
no shutdown
pvc 0/35
pppoe-client dial-pool-number 1
exit
exit
interface Dialer2
exit
default interface Dialer2
interface Dialer2
ip mtu 1452
no shutdown
ip address negotiated
dialer pool 1
dialer-group 1
encapsulation ppp
dialer idle-timeout 120
dialer fast-idle 20
ppp authentication chap pap callin
ppp pap sent-username username

ppp chap password 0 password
exit
dialer-list 1 protocol ip permit

Thanks!

Latchum Naidu · ‎02-11-2011

Hi,

Please see the below will help you...

These commands will configure the interface your Ethernet0

     #Description Ethernet
     #ip address 192.168.0.1 255.255.255.0
     #no ip redirects
     #no ip unreachables
     #no ip proxy-arp
     #ip nat inside

Now setup the ATM interface (the broadband internet facing interace that plugs into the BT line). On the line pcv 0/38 you may have to change this to one your ISP provides you with.

     #interface ATM0
     #no ip address
     #no ip redirects
     #no ip unreachables
     #no ip proxy-arp
     #no atm ilmi-keepalive
     #dsl operating-mode auto
     #pvc 0/38
     #encapsulation aal5mux ppp dialer
     #dialer pool-member 1

Now setup the virtual interface called dialer0. This is where you actually put in the login details provided by your ISP. Unlike some leased lines such as an E1 or framerelay you may have setup before, you actually have to provide a chap password for the connection to work. In fact it is a bit like the ISDN routers you may have setup in the past. Remember to change the ppp chap lines in my example to suit YOUR broadband account connection details

     #interface Dialer0
     #ip address negotiated
      ip virtual-reassembly
     #encapsulation ppp
     #dialer pool 1
     #dialer-group 1
     #no cdp enable
     #ppp authentication chap callin
     #ppp chap hostname myuser@adsl.user.name.com
     #ppp chap password 0 adslpassword

NOTE! Some ISPs require some additional chap settings. If when you type in
show ip int d0

You receive a message about 'ip address will be assigned' but no actual ip address has been assigned as yet you may need these additional commands:

     #ppp pap sent-username myuser@adsl.user.name.com 0 adslpassword
     #ppp ipcp mask request
     #ppp ipcp route default
     #ppp ipcp address accept

Setup the default route so traffic fot the net goes out via the "dialer" interface

#ip route 0.0.0.0 0.0.0.0 Dialer0

Setup the NAT to allow enable traffic to pass

#ip nat inside source list 1 interface Dialer0 overload

Finally write the configuration to NVRAM to the router so the device will not forget it when it is rebooted

Please rate the helpfull posts.

Regards,
Naidu.