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WirelessMesh
What is a Wireless Mesh
What is a free information network
What do we need to setup a wireless mesh
Wllingness to share a pinch of what you have, apart from the following.
Hardware
Linksys WRT54GS V.4 Wireless Routers. This is used since we can add [freifunk firmware]http://wiki.freifunk.net/Freifunk_Firmware_%28English%29. Freifunk site also lists few other routers. You can use any of them. Of course it is possible to create a wireless mesh using any PC with a WLAN card.
Software
First of course is the recent firmware from Freifunk website. After setting up and with a working network you can later add other additional software available from the same site.
This firmware contains a tiny but sufficiently equipped Linux kernel, busybox userland tools, ssh, iptables and a package manager called ipkg.