Unanswered Question
Dec 3rd, 2008

I try to get an IP address for the interface this card generates (interface Cellular 0/3/0) I already did basic configuration for it but nothing happens. Doing "show ip interface brief" the interface is up in status and up in protocol and doing "show cellular 0/3/0 network" it seems like the card recognize the service provider but the service is in Inactive state. My question is if I have to use an username and password for this and how I get them (user and password)??

Any help I'll be great. Thanks

I have this problem too.
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macepeda.plannet Tue, 12/09/2008 - 16:00

I already had that manual, thank you anyway. I need to know if user and password MUST be given by the carrier to get internet access with the hwic-3g-gsm because I already did configuration example stated in the manual but it doesn't work. I mean, the interface cellular doesn't get an IP address. Do you know something about it??

Svante Bolander Mon, 12/15/2008 - 12:51

If you have experience in PPP-configuring on dial interfaces you can apply them on Cellular interfaces as well. They work the same using Dial on Demand Routing. You need interresting traffic to trigger the dialer to make a packet connection to the cellular network. Then there is a PPP negotiation, then a dummy PPP authentication, then a IPCP-negotiation, where you will get the IP-address. The dialer string should be *99#.

Try sending traffic out the Cellular interface and watch debug dialer, debug ppp neg and debug ppp authen.

kontactweb Wed, 12/17/2008 - 10:24

Just curious why your modem string is different than the one in the cisco instructions-they are showing "ATDT*98*2#" I have the same problem, cannot activate the profile I created.

macepeda.plannet Mon, 12/29/2008 - 16:56

Hi, I'm using that same modem string wich is "ATDT*98*2#" and I still don't know why this doesn't work, sorry. As soon I find out the way this works I will publish it.

macepeda.plannet Mon, 12/29/2008 - 16:51

Thanks for your reply on this but for ppp authentication I have not username and password because the sim I'm using it suppose doesn't require them so Do this can works without username and password on PPP Authentication command configuration line??

jennyjohn Thu, 05/07/2009 - 02:10

Some 3G Service Providers do not use a PPP authentication username & password. In that case you can create a profile by leaving those variables blank.


R1#cellular 0/0/0 gsm profile create 7 web.isp

where 7 is the profile number and web.isp is the APN (Access Point Name) provided by the Service provider.

To check if your profile is active you can verify by

R1#show cellular 0/0/0 profile

To use the active profile enter the active profile number (7) in the modem connection command.

chat-script gsm "" "ATDT*99*#7" TIMEOUT 60 "CONNECT"

But you will still need to configure a dummy CHAP hostname and password on the cellular interface.

interface Cellular0/0/0

ip address negotiated

encapsulation ppp

load-interval 30

dialer in-band

dialer string gsm

dialer-group 2

async mode interactive

ppp chap hostname [email protected]

ppp chap password 123

ppp ipcp dns request

max-reserved-bandwidth 100


Hope this helps


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