I've been running Slackware 9.1 on my laptop for the past few months without any problems, but just a couple of days ago it stopped getting an IP address from the DHCP server in our router.

I think I got an IP address from the DHCP at school a few days ago(10.196.65.123), and now my machine assumes that address at home.

I can ping the router (192.168.0.1)
I cannot get any access to the Internet.
I have tried "ifconfig eth0 up" and "ifconfig eth0 down" and it still does not renew the IP address.

How do I tell it to stop assuming the address I got from school and to take an address from the DHCP server that is in our router?

(again, this has all worked fine for months; my machine has been to school and back before and everything was fine, so none of this makes any sense to me)

Maybe /etc/dhcpc/dhcpcd-eth0.info has become corrupt?

Proberly was your lease time up. So remove /etc/hdcpc/*.pid and do a
dhcpcd eth0

Cheers

to renew ip on dhcp setting
just
ifconfig eth0 down
cd /etc/rc.d
./rc.inet1

Thank you very much, everybody!

I'm on my laptop now and it seems to be fine. I haven't been back to school yet, though, so we'll see how it behaves Monday.

What I ended up doing was deleting most of the files in etc/dhcpc/ including:

dhcpcd-eth0.pid
dhcpcd-eth0.info
dhcpcd-eth0.cache

And then running #dhcpcd eth0

Thanks again to all who helped!