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Howto: Configure a Cisco HWIC-3G, EHWIC-4G...

This Link Can be useful for thoes who are using HWIC/EWIC Wireless 3G/4G as WAN link.

Things to remark are:

1.- Create the profile, it need to match the APN values your SIMM card are provisioned with, besides be careful if the networks does authentication or not, chat script must have a name used for "dialer" string

2.- Create the chat script, this sentence is used by IOS to "Dial Up" the modem 3G/4G, if you have more than one profile, try make it match after the dial number "ATDT*99#"  or  "ATDT*98*n#" if you intend to use the profile "n" linked to the APN  the Mobile Network Operator assign to your service

3.- Configure the Cellular interface it must include all the classicc commands for dial DDR, the main considerations is if your provider ask for authentication, it must be the same user and password you add into the cellular profile, if you don´t include it you will need to modify

interface Cellular0/1/0

description WAN 3G -- > this network didn´t ask for authentication

ip address negotiated

ip nat outside

ip virtual-reassembly in

encapsulation ppp

load-interval 30

dialer in-band

dialer idle-timeout 0

dialer string gsm

dialer-group 1

async mode interactive

ppp chap refuse

ppp ipcp dns request

ppp ipcp route default


4.- Define interesting traffif for DDR to work, so ACL must be created as you usually does.

access-list 1 permit any

dialer-list 1 protocol ip permit

5.- Config the Line related to the cellular interface

line 0/1/0 ---> match the cellular interface slot/port number

exec-timeout 0 0

script dialer gsm --> the same name as chat-script

modem InOut

no exec

transport preferred none

transport input all

transport output none

6.- Configure Staticr route pointing to the cellular 0/1/0 interface in order to make the DDR work.

7.- Use ip SLA as a trigger for cellular conecction to the networks

ip sla 1

icmp-echo  -->  Point to other Public IP address if your APN provides Internet Service, if not use a private address to trigger the conection

threshold 2000

timeout 2000

frequency 2

ip sla schedule 1 life forever start-time now

8.- Use the show cellular 0/x/0 all, for check parameter related to radio, data connections, Network , etc.

more specific show cellular 0/x/0 radio for check signal strenght

LocalRouter#show cellular 0/1/0 radio history all

LocalRouter   02:43:00 AM Friday Jan 3 2014 UTC












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Hoppe this can be helpful for any Wireless WAN connection, this link provides more detailed information


Juan M.

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