Wi-Fi How To

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m (Isolate two networks: edit)
m (Measure wireless network performance: update)
 
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* Internet speed testing (''e.g., ''[http://nitro.ucsc.edu/ NDT]) probably ''won't'' tell you anything about your wireless network performance (because wireless is normally faster than an Internet connection).
* Internet speed testing (''e.g., ''[http://nitro.ucsc.edu/ NDT]) probably ''won't'' tell you anything about your wireless network performance (because wireless is normally faster than an Internet connection).
* Instead, measure data transfer throughput between two computers on your network, using software tools such as:
* Instead, measure data transfer throughput between two computers on your network, using software tools such as:
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** [http://dast.nlanr.net/Projects/Iperf/ Iperf]
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** [http://iperf.sourceforge.net/ Iperf]
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** [http://code.google.com/p/xjperf/ Jperf]
** [http://freshmeat.net/projects/netio/ Netio]
** [http://freshmeat.net/projects/netio/ Netio]
* Wireless to ''wireless'' speed will probably be much less than wireless to ''wired'' speed, because ''only one wireless link in one direction can be active at any one time''.
* Wireless to ''wireless'' speed will probably be much less than wireless to ''wired'' speed, because ''only one wireless link in one direction can be active at any one time''.
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== Isolate Two Networks ==
== Isolate Two Networks ==
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Isolate two local networks from each other with both able to access the same Internet connection:
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[[Image:Isolated Networks.png|right|frame|Two Networks with Internet access that are isolated from each other]]
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Isolate two local networks from each other with both able to access the same Internet connection using low-cost routers:
* Use three (3) routers (A, B, and C)
* Use three (3) routers (A, B, and C)
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* Connect network A to the wireless or LAN ports on router A
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* Connect network A to the wireless and/or LAN ports on router A
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* Connect network B to the wireless or LAN ports on router B
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* Connect network B to the wireless and/or LAN ports on router B
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* Connect router A and router B WAN ports to LAN ports on router C
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* Connect router A and router B WAN (Internet) ports to LAN ports on router C
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* Connect the WAN port on router C to the Internet
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* Connect the WAN (Internet) port on router C to the Internet
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Notes:
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* Routers A and B can be wired and/or wireless.
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* This method involves Double NAT, which can sometimes cause problems. (See [[wikipedia:Session Traversal Utilities for NAT|Session Traversal Utilities for NAT]])
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* The same effect can also be achieved with a single router that supports [[wikipedia:Virtual LAN|Virtual LAN]] (VLAN) without double NAT, although it may be less secure.
== WPA/WPA2 ==
== WPA/WPA2 ==
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=== Use WPA/WPA2 Enterprise ===
=== Use WPA/WPA2 Enterprise ===
WPA Enterprise enhances security and is preferred over WPA because each client is authenticated separately. (Sharing a key is a security risk.) Practical authentication ([[wikipedia:RADIUS|RADIUS]]) solutions for small wireless networks include:
WPA Enterprise enhances security and is preferred over WPA because each client is authenticated separately. (Sharing a key is a security risk.) Practical authentication ([[wikipedia:RADIUS|RADIUS]]) solutions for small wireless networks include:
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* [http://us.zyxel.com/web/product_family_detail.php?PC1indexflag=20040520161256&CategoryGroupNo=1FD9B843-06BE-448D-B770-5383D40CD32E ZyXEL G-2000 Plus] (wireless router with built-in PEAP server)
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* '''RADIUS Service'''
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** [http://cloudessa.com/ Cloudessa] ''(free for up to 100 users)''
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* '''Wireless Router with built-in PEAP Server'''
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** [http://us.zyxel.com/web/product_family_detail.php?PC1indexflag=20040520161256&CategoryGroupNo=1FD9B843-06BE-448D-B770-5383D40CD32E ZyXEL G-2000 Plus]
== Secure a wireless network ==
== Secure a wireless network ==
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* Run Cat-5 or better cable from one of wireless router's RJ45 ports around or (drilled) through the wall, and on the other side of the wall attach a wireless access point.
* Run Cat-5 or better cable from one of wireless router's RJ45 ports around or (drilled) through the wall, and on the other side of the wall attach a wireless access point.
* Use [[wikipedia:HomePlug Powerline Alliance|powerline]], [[wikipedia:HomePNA|phoneline]], or [[wikipedia:Multimedia over Coax Alliance|coax]] networking to attach a wireless access point on the other side of the wall, if any of these cables are available on both sides of the wall.
* Use [[wikipedia:HomePlug Powerline Alliance|powerline]], [[wikipedia:HomePNA|phoneline]], or [[wikipedia:Multimedia over Coax Alliance|coax]] networking to attach a wireless access point on the other side of the wall, if any of these cables are available on both sides of the wall.
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== Block Wi-Fi signal ==
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[[wikipedia:Mobile phone jammer|Jamming]] isn't lawful (in the USA at least), but these methods are:
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* Paint with [[wikipedia:Radio frequency|RF]] shielding (e.g., [http://www.lessemf.com/paint.html Y-Shield], claimed attenuation of 40 dB per layer)
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* [http://www.baesystems.com/ProductsServices/ss_tes_atc_adv_mat_stealthy.html Stealthy wallpaper]
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* [http://www.tempestusa.com/DataStop.html RF shielding glass]
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== Disable b Wi-Fi ==
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* Pro
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* Con
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* How
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{{TODO}}
== Roam seamlessly (using VPN) ==
== Roam seamlessly (using VPN) ==
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== Make a Wi-Fi enclosure ==
== Make a Wi-Fi enclosure ==
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{{TODO}}
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== Hack Wi-Fi ==
{{TODO}}
{{TODO}}

Latest revision as of 21:55, 19 March 2013

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