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-   -   DHCP and cable modem (http://www.linuxquestions.org/questions/linux-networking-3/dhcp-and-cable-modem-497490/)

Rolgar 11-01-2006 05:36 AM

DHCP and cable modem
 
I have cable internet and a Debian Etch install. I don't like to leave my cable modem on all the time, so I unplug the power on it when not in use. Sometimes when I plug it back in, it doesn't connect to the internet properly, typically if it has been 10-12 hours since the last time I used it. Rebooting fixes the problem, but I'd like to be able to run a command or script to fix it without the reboot.

The only thing I've really found so far is through running the route command.

When it's working correctly, route reveals this:

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
24.255.224.0 * 255.255.224.0 U 0 0 0 eth0
default ip24-255-224-1. 0.0.0.0 UG 0 0 0 eth0


When I can't connect to the internet, the routing table looks like this.
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
24.255.224.0 * 255.255.224.0 U 0 0 0 eth0

I've tried manually adding the default route, but maybe I entered it wrong, I've tried taking the eth0 down and back up. Maybe I just need to manually run DHCP? Anybody have any ideas?

I appreciate any help anybody might have. Thanks.

sleepyEDB 11-01-2006 07:21 AM

Maybe you just need to refresh the network interface (I assume it's eth0) once you've plugged the cable modem back in.

As root, after the cable modem is powered up:

# ifdown eth0
# ifup eth0



sleepy


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