faktusbaktus wrote:
I'm fairly new to cisco especially my new (used) Cisco 871 router.
I have a cable modem that gives me a dynamic ip address..
I haven't tried to connect the router to the internet yet, but i'm wondering: Is it possible to configure the wan interface fe4 to work with a dynamic IP (my ISP don't offer anything else)..? every other router that i have configured i've always used a static 
-fb
newbie

Yes it is possible, you would configure it like this -

int fa4

ip address dhcp

Jon