configure CISCO881GW router to use APN with no user name and password

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Dec 18th, 2009
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Hi there,

I am trying to configure the above router to establish 3G connection, but we are based in UK and our provider has supplied us with ONLY APN: 3internet - we are NOT meant to use user name or password and we have asked them, but they can't provide us with one..., but the router seems to require it?!?

when configuring the router I get these "% Incomplete command" messages

Should I assume that the router can ONLY be used with APNs that have user names and passwords?

CISCO881GW(config)#interface cellular 0
CISCO881GW(config-if)#ppp chap hostname
% Incomplete command.

CISCO881GW(config-if)#ppp chap password 0
% Incomplete command.

CISCO881GW#cellular 0 gsm profile create 1 3internet chap
% Incomplete command.

% Login disabled on line 3, until 'password' is set

Any help appreciated

CISCO881GW#sh cellular 0 profile 1
Profile 1 = INACTIVE*
PDP Type = IPv4
Access Point Name (APN) = 3internet
Authentication = None
Username: , Password:

* - Default profile

chat-script gsm "" "ATDT*98*1#" TIMEOUT 60 "CONNECT"

interface Cellular0
ip address negotiated
no ip redirects
no ip unreachables
no ip proxy-arp
ip flow ingress
encapsulation ppp
dialer in-band
dialer string gsm
dialer-group 1
async mode interactive


line 3
exec-timeout 0 0
script dialer gsm
modem InOut
no exec
speed 384000


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paolo bevilacqua Fri, 12/18/2009 - 05:06
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As long the ISP does not request authentication, the chap commands are optional.

You can verify that with "debug ppp auth" and "term mon". Fri, 12/18/2009 - 08:16
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i can use this SIM card in another non-cisco router with no problem - only APN is needed with no user name and password

I do however see auth required below:

000698: *Dec 18 15:41:41.395 PCTime: %LINK-3-UPDOWN: Interface Cellular0, changed state to up
000699: *Dec 18 15:41:41.395 PCTime: %DIALER-6-BIND: Interface Ce0 bound to profile Di1
000700: *Dec 18 15:41:41.395 PCTime: Ce0 PPP: Using dialer call direction
000701: *Dec 18 15:41:41.395 PCTime: Ce0 PPP: Treating connection as a callout
000702: *Dec 18 15:41:41.395 PCTime: Ce0 PPP: Session handle[A9000065] Session id[34]
000703: *Dec 18 15:41:41.395 PCTime: Ce0 PPP: Authorization required
000704: *Dec 18 15:41:41.395 PCTime: Ce0 PPP: No remote authentication for call-out
000705: *Dec 18 15:41:41.399 PCTime: Ce0 PPP: No authorization without authentication
000706: *Dec 18 15:41:41.399 PCTime: Ce0 CHAP: I CHALLENGE id 1 len 35 from "UMTS_CHAP_SRVR"
000707: *Dec 18 15:41:41.399 PCTime: Ce0 CHAP: Unable to authenticate for peer
000708: *Dec 18 15:41:41.403 PCTime: TTY3: Async Int reset: Dropping DTR
paolo bevilacqua Fri, 12/18/2009 - 08:44
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Try configuring a dummy password.

dvanhoyweghen Tue, 02/02/2010 - 22:49
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Did You find a solution for your problem ?

If yes, please can You send me the working configuration , so I can try it here in Belgium.

Best regards



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