I'm not sure of RH8, but FC2 keeps all it's network devices (connections) in two locations:
/etc/sysconfig/networking/devices
/etc/sysconfig/network-scripts
You might want to set it up manually, so try this:
# cd /etc/sysconfig/networking/devices
# ls
See if a file called ifcfg-eth0 is listed. Just remember if it wasn't:
# vim ifcfg-eth0
I use Comcast also, so yours should probably look like mine also. See if all your settings look like this:
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=dhcp
USERCTL=yes
PEERDNS=yes
TYPE=Ethernet
MODE=managed
Press escape and then :wq to save and quit out of vim.
if you didn't have a ifcfg-eth0 file in the directory, you need to do this:
# cd /etc/sysconfig/network-scripts
# ln /etc/sysconfig/networking/devices/ifcfg-eth0
I use a router and a D-Link DWL-G520, so if you're connecting directly to your cable modem, you may need to set up some stuff, which I think you can do through the GUI.
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