Config for 2821 & WIC-1ADSL on AT&T ADSL

Unanswered Question
Oct 29th, 2007

We have a Cisco 2821 with the WIC-1ADSL which I am attempting to setup *without* PPPoE, and have had no success after following various configuration examples here on Cisco's site. I have had no trouble in the past setting this same hardware up with PPPoE.

I have confirmed the line is working with a Netopia in bridged ethernet mode so multiple static IP's could be used.

Does anyone have any recommendations for a configuration for this setup?

I have this problem too.
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Paolo Bevilacqua Mon, 10/29/2007 - 15:16

Should be like this, what do you have?

int atmX/Y

no ip address

int atm0.1 point-to-point

pvc z/k

encapsulation aal5snap

bridge-group 1

int bvi1

ip address ..

bridge irb

bridge 1 protocol ieee

bridge 1 route ip

cintergis Tue, 10/30/2007 - 08:44

Below are the relevent portions of the current config:


bridge irb

bridge 1 protocol ieee

bridge 1 route ip

interface ATM0/0/0

no ip address

no atm ilmi-keepalive

dsl operating-mode auto

interface ATM0/0/0.1 point-to-point

no ip proxy-arp

bridge-group 1

pvc 0/35

encapsulation aal5snap

interface BVI1

ip address 76.x.x.129


ATM0/0/0, ATM0/0/0.1, and BVI1 are all up & up. PVC also shows up. However, I'm still unable to pass traffic to the gateway at 76.x.x.134.

Any ideas?

Paolo Bevilacqua Tue, 10/30/2007 - 09:44

Any chance they are using aal5mux on the PVC?

That would require "encapsulation aal5mux bridge".

Hope this helps, please rate post if it does!

cintergis Tue, 10/30/2007 - 12:47

The Netopia was using AAL5SNAP, but I went ahead and tried AAL5MUX IP on the 2821, to no avail. AAL5MUX Bridge was not available, as configured.

Paolo Bevilacqua Tue, 10/30/2007 - 14:07

That is strange.. which exact IOS are you using ?

can you try disabling ip route-cache under interface and "debug ip packet", "debug arp", are interface counters increasing ?


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