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PPPoA on Cisco 1700 w/ ADSL WIC - Can't Get it Working

Posted on 2005-03-12
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Last Modified: 2010-04-10
Trying to configure my cisco 1721 w/ adsl wic to allow me to connect to the internet via ADSL. My provider has indicated that these are the correct settings:

VPI: 0
VCI: 38
Encapsulation: PPPoA using VC-Mux
Authentication: CHAP
Modulation: G.dmt

Have tried going through all the PPPoA docs on Cisco.com, but still can't get it working. I have gotten it so that the dialer0 indicates it gets the correct IP from my provider, but I can't ping any IP on the net. Here is my config--any help greatly appreciated:


Using 1278 out of 29688 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname xxx

!
boot-start-marker
boot-end-marker
!
enable secret xxx
enable password xxx
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no aaa new-model
ip subnet-zero
no ip routing
!
!
!
!
no ip cef
!
!
!
!
interface ATM0
 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 dsl operating-mode auto
 hold-queue 224 in
 pvc 0/38
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !
!
interface FastEthernet0
 ip address 192.168.20.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
 no ip route-cache
 no ip mroute-cache
 speed auto
!
interface Serial0
 no ip address
 no ip route-cache
 shutdown
 no fair-queue
!
interface Dialer0
 ip address negotiated
 ip nat outside
 ip virtual-reassembly
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 ppp authentication chap callin
 ppp chap hostname XXX
 ppp chap password 0 YYY
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
no ip http server
!
!
!
dialer-list 1 protocol ip permit
!
!
control-plane
!
!
line con 0
line aux 0
line vty 0 4
 password
 login
!
end

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Question by:jbreg
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8 Comments
 
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Expert Comment

by:patrickab
ID: 13525632
Your router's IP address will almost definitely be 192.168.20.1 and the sub-net IP address 255.255.255.0 that should make your pc 192.168.20.2 with subnet 255.255.255.0.

I suggest that you don't use any of these IP addresses and instead tick the boxes for automatic address configuration. It saves a lot of bother.
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LVL 45

Expert Comment

by:patrickab
ID: 13525646
By the way if you attached you router to your pc by ethernet you'll need to use PPpoE - my guess is that your router has a built in ADSL modem and that you've adopted the fastest link to your pc which probably also acts as a print server for the other wireless users.
0
 

Author Comment

by:jbreg
ID: 13525649
That's correct, but that doesn't change the fact that I can't ping anything on the Net *from the router* let alone the network. And that internal addressing will work fine, once the router starts being able to see the outside world.
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Author Comment

by:jbreg
ID: 13525654
Patrick, this is a cisco 1700 series. I don't really understand the relevance of your comments.
The Fe0 of the router goes into a switch, of which one port goes into the server in question. But all this is irrelevant to the question: what's wrong with the config above such that I cannot ping net addresses from the router.
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LVL 45

Expert Comment

by:patrickab
ID: 13526064
jbreg - OK - please ignore my comments completely - Patrick
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Author Comment

by:jbreg
ID: 14005324
I found the answer by Posting on Google Groups comp.dcom.sys.cisco. Here is the summary:

1. Enable IP routing

2. access-list 1 permit 192.168.20.0 0.0.0.255
 ip nat inside source list 1 interface Dialer0 overload

With those commands it works great!

Reccomend PAQ with points refunded.
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LVL 45

Expert Comment

by:patrickab
ID: 14005390
Reccomend PAQ with points refunded. Agreed.
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ID: 14051804
PAQed with points refunded (500)

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