Configuring PPP on a HWIC-1ADSL

Unanswered Question
Jun 29th, 2008

I am having difficult getting my DSL connection operational. I have a 2811 with a HWIC-1ADSL module with ios version 12.4. Below is a copy of part of my config.

Also the ATM is working but I not authenticating.

interface ATM0/3/0

no ip address

no atm ilmi-keepalive

dsl operating-mode auto

pvc 0/32

encapsulation aal5mux ppp


interface Virtual-Template1

ip address dhcp

ip mtu 1492

ppp authentication chap callout

ppp chap hostname XXXX

ppp chap password 0 XXXX


Any suggestions would be a great help.

I have this problem too.
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Paolo Bevilacqua Sun, 06/29/2008 - 15:24

Hi, most likely you need a pppoe configuration, not pppoa. Search "pppoe configuration example", there are many.

brianmahler Sun, 06/29/2008 - 17:41

After looking around I changed it to this. But no change .

interface ATM0/3/0

description Qwest DSL circuit

no ip address

no atm ilmi-keepalive

dsl operating-mode auto

pvc 0/32

encapsulation aal5mux ppp dialer

pppoe-client dial-pool-number 1



interface Vlan1

no ip address


interface Dialer1

ip address negotiated

encapsulation ppp

dialer pool 1

no cdp enable

ppp pap sent-username xxxx password 0 xxxx


I have included the results of the #show dsl interface atm 0/3/0 command as follows:

2811-gw#show dsl interface atm 0/3/0


Alcatel 20150 chipset information


Modem Status: Showtime (DMTDSL_SHOWTIME)

DSL Mode: ITU G.992.1 (G.DMT) Annex A

ITU STD NUM: 0x01 0x1

Vendor ID: 'ALCB' 'BDCM'

Vendor Specific: 0x0000 0x6193

Vendor Country: 0x00 0xB5

Capacity Used: 98% 84%

Noise Margin: 8.5 dB 14.0 dB

Output Power: 19.0 dBm 11.0 dBm

Attenuation: 54.5 dB 30.0 dB

Defect Status: None None

Last Fail Code: None

Selftest Result: 0x00

Subfunction: 0x15

Interrupts: 2662 (0 spurious)

PHY Access Err: 0

Activations: 2

LED Status: ON

LED On Time: 100

LED Off Time: 100

Init FW: embedded

Operation FW: embedded

SW Version: 3.8131

FW Version: 0x1A04

Interleave Fast Interleave Fast

Speed (kbps): 3072 0 640 0

Cells: 80 0 563894 0

Reed-Solomon EC: 161 0 2 0

CRC Errors: 0 0 0 0

Header Errors: 0 0 0 0

Bit Errors: 0 0

BER Valid sec: 0 0

BER Invalid sec: 0 0

LOM Monitoring : Disabled

I think my problem is authenitication. All the ISP is telling me we dont support that modem. and that it should be set to ppp chap.

thanks for the quick reply on the last posting.

Paolo Bevilacqua Mon, 06/30/2008 - 10:04

s, as mentioned bdeof, you need to confirm with if it has to PPPoE, PPPoA, or both are supported. If it isn authentication problem, this show with "debug ppp auth" and "term mon".


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