The Linksys WRT54G and WRT54GS boxes have available many 3rd party firmware options allowing you to add features not available in the Linksys factory firmware. One of those firmwares is called Talisman.
Howto...: Howto: Share Your Internet with a Neighbour
This page documents one of the most common wireless networking applications; sharing a single broadband connection (eg ADSL, Cable, ...) with your neighbours/friends.
Posted by rclark on Sunday, December 26 @ 18:38:21 CST (13065 reads)
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Howto...: Howto: Build a wireless network 'Across Water'
Special consideration needs to be taken if you are planning a WiFi link across a body of water that is subject variations in level. For example, tides.
See this link
Howto...: Howto: Build a wireless network 'Across Town'
It will be assumed the objective is to extend one home LAN to a second house that is a few km away - up to 25km. This creates one virtual Local Area Network (LAN), spread over two houses. If one of those has an Internet connection, then PCs in both houses will be able to surf the Internet via the one shared Internet connection.