If you had the NIC in the computer when you installed, Red Hat probably configured it.
(If you need to change the configuration, run linuxconf (open a terminal
window, su to root, and type linuxconf).
1. Under Networking, select Host Name and IP Network Devices.
2. Under adapter 1, make sure the enabled box is selected
3. set a primary name (not necessary, but never a bad idea)
4. set the adapter to use DHCP (unless you get a static IP from Verizon)
5. set your netmask to the one your ISP indicates in their Windows instructions (eg. 255.255.255.0) or go into your windows desktop, click Start, Run, type the command winipconfig, and take down the information stored there.
6. accept these settings
7. Under Name Server Specification enter the DNS servers provided by your ISP in their Windows instructions. Note that if they didn't provide DNS server names, you can set the primary name to the same name that you will set the default gateway to in the next step.
8. Under routing and gateways set the default gateway to the IP address indicated by your ISP (e.g. 192.168.1.1 or 10.0.0.1)
9. This should be all you need to get connected, though if your ISP is using PPPoE you may need to invest in a DSL router (Linksys makes a great one that can be configured using a web browser) to place between the DSL and your computer.
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If you want to share cable access and have a your connection on Windoze ME/XP machine:
1. Go to Network properties, select the internet NIC and go to properties, enable internet connection sharing.
2. On the linux box, open up linuxconf, go to "Networking", "Routing and Gateways", "Defaults" and put in the ip of the second (lan) interface on the windows box. Dismiss and quit and restart the network service and all should work.
If the cable resides on the Linux box :-
iptables -A FORWARD -s 192.168.0.100 -p all -j ACCEPT
I don't know whether windows will try and connect through the lan by default or whether you'd need to specify a default route somewhere. Someone else could clear this up.