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#1. Easiest way: use a router.
Most cable/DSL consumer oriented routers work without any additional configuration and you only have to pay for them once. Most are useable in 3 easy steps:
a. Connect the router to the ethernet port of the modem.
b. Connect the computers to the router.
c. Then power cycle all the connected components in order: modem, router, computer.
As shown a computer with ICS (internet connection sharing) enabled can also be used in the same manner, but that takes extra equipment and set-up beyond the scope of this FAQ entry.
#2. Lease another IP address
This method takes 2 things: the hub or switch and leasing additional IP addresses from Adelphia ($5.95 per month extra for a total of 5 IPs). Once the modem is configured to allow the requested number of computers online, the setup is similar to using a router:
a. Connect the hub or switch to the ethernet port of the modem.
b. Connect the computers to the hub or switch.
c. Then power cycle all the connected components in order: modem, hub/switch, computer.
#3. Request another cable modem connection from Adelphia
The method is the most expensive as a second modem is $39.95 per month for Adelphia, where available.
For much more information on connection sharing, see the BBR Networking FAQ: