By Rob Flickenger
Construction instant group Networks is set getting humans on-line utilizing instant community know-how. The 802.11b common (also referred to as WiFi) makes it attainable to community cities, colleges, neighborhoods, small companies, and nearly the other type of association. All that is required is a willingness to cooperate and proportion assets. the 1st variation of this e-book helped hundreds of thousands of individuals have interaction in neighborhood networking actions. at the present time, with WiFi-enabled desktops virtually as universal as Ethernet, it makes much more experience to take the next move and community your group utilizing not anything however the freely availale radio spectrum. This publication has proven many folks easy methods to make their community to be had (even from a park bench), the best way to expand high-speed web entry into the numerous components now not served by means of DSL and cable services, and the way to construct operating groups and a shared, even though intangible community. All you must create an entry aspect for high-speed web connection is a gateway or base station. as soon as that's arrange, any computing device with a instant card can get onto the community. His services, in addition to his humorousness and exuberance for the subject, makes construction instant group Networks a really necessary and readable publication for a person drawn to instant connectivity.
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Additional resources for Building Wireless Community Community Networks
Clients with a blank ESSID, or one set to ANY. To make your network closed, check the Closed network box under Wireless LAN Settings. Remember that without encryption, all traffic is sent in the clear, so anyone within range could potentially read and reuse sensitive information (such as ESSIDs and valid MAC addresses). Even with WEP, every other legitimate user can see this traffic. If you need to restrict access to a user later, you'll need to change the WEP key on every wireless client. But for small groups of trusted users, using these access control methods should discourage all but the most determined black hat without too much hassle.
In addition to providing access control, the access point also maintains its own network connections. This includes functions such as dialing the phone and connecting to an ISP on demand, or using DHCP on the Ethernet interface to get a network lease. Most access points can provide NAT and DHCP service to the wireless clients, thereby supporting multiple wireless users while requiring only a single IP address from the wire. Some support direct bridging, allowing the wired and wireless networks to exchange data as if they were physically connected together.
This means that a nefarious individual somewhere between you and your mail server (either elsewhere on your wireless network, or even "on the wire" if you are separated by another network) could be listening and could grab a copy of your information en route. This login could then be used not only to gain unauthorized access to your email, but in many cases will also grant a shell account on your mail server! To prevent this, you can use the tunneling capabilities of SSH. An SSH tunnel works like this: rather than connecting to the mail server directly, we first establish an SSH connection to the internal network that the mail server lives in (in this case, the wireless gateway).