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New Member

Cisco 887VAG Configuration

Hi All,

I got my hands on a Cisco 887VAG router with the intention to set up the router in a routed mode "will be coonected to private boardband network" with 3G backup which will use a VPN tunnel. i have looked all over the web and come up with the follwoing basic config.

Can some one please piont me in the right dirrection as 3G is not coming up when ADSL line is disconnected.

Config Attached.

Everyone's tags (3)

Cisco 887VAG Configuration


I take it you have the SIM card installed,and the radio is up,and this configuration is just to bring the 3g interface up,

I notice in the configuration:

interface Cellular0

encapsulation slip

and interface Dialer1

encapsulation ppp

should both be ppp

run debug ppp authentication to see if authenticating with your telco.

the dialer interface should look something like this if used as a backup

interface Dialer2

ip address negotiated

ip access-group 101 out

ip flow ingress

encapsulation ppp

dialer pool 2

dialer idle-timeout 30 < timeout should be set otherwise never goes down

dialer string telstra

dialer watch-group 2 < need a watch group so that when route via ADSL is lost will initate the dialer

dialer-group 2

ppp authentication chap callin

ppp chap hostname aaaaa

ppp chap password 7 cccc

ppp ipcp dns request

no cdp enable

New Member

Cisco 887VAG Configuration

Good Morning thanks for taking the time to reply.

The SIM is in slot 0 its a  BT mobile sim which uses the Vodafone network in the UK.

When i do a sh int sum Cellular 0 is down. so this is my first issue i belive.

On the issue of Slip or PPP their seems to be conflicting reports on the web wheather to use Slip or PPP so i was unsure which is best for the UK.

interface dialer 1 is used to connect to priavte ADSL circutit in the uk and this part works. Becauce we use a private  board band on the router when on its ADSL the router needs to be in ip routedmode so that all wan devices can see each other.

i belive my first piont is to get the Cellular0 interface to come up and work correctly.

Cisco 887VAG Configuration


I don't know the setup required in the UK

does the SIM need to be unlocked?

cell 0 gsm sim unlock  you need the SIM pin if it has one

also  you need something like

chat-script telstra "" "ATDT*98*1#" TIMEOUT 30 CONNECT

and link the chat script to line 3

line 3

exec-timeout 0 0

script dialer telstra

modem InOut