Background of Wireless Communication Wireless Communication Technology Wireless Networking and Mobile IP Wireless Local Area Networks Wireless Communication.

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Presentation transcript:

Background of Wireless Communication Wireless Communication Technology Wireless Networking and Mobile IP Wireless Local Area Networks Wireless Communication Systems Setting up Wireless Mesh Networks – II (b) Wireless Personal Area Networks Wireless Metropolitan Area Networks Wireless Wide Area Networks

Lab Overview  Lab: Flashing a wireless router  Lab: Configuring a Freifunk based mesh network

Flashing a Wireless Router

Flashing a WRT54G  Find out exactly what model and hardware revision you have  Find the right firmware accordingly and verify that it will run  Find out the device's default IP, e.g for Linksys WRT54G(L)  Set your own IP by > ifconfig eth up or get a DHCP lease  Connect to the device's original web interface (see: Access Point configuration) and find the "Firmware Update" button  Using the Update Button, opload the firmware file, e.g. "openwrt- gfreifunk-x.y.z-en.bin" for a Freifunk Firmware  NOW: REMEMBER TO WAIT! DO NOT PRESS CONTINUE WHEN IT SHOWS!!! DONT!!! WAIT UNTIL THE LEDS STOP BLINKING!  TYPICALLY 4-6 MINUTES!  MAKE SURE YOU HAVE STABLE POWER WHILE DOING THIS!

Debricking a WRT54G  Power down the WRT54GL  Example of a tftp transmission:  on a linux command line, do  /]# ifconfig eth up  /]# tftp -v -m binary  mode set to octet  Connected to ( ), port 69  tftp> put openwrt-g-freifunk en.bin   putting openwrt-g-freifunk en.bin to :openwrt-gfreifunk-  en.bin [octet]  Sent bytes in 7.9 seconds [ bit/s]  tftp>  If debricking via tftp fails, you will have to open the device and do some pin magic – read more here:    jtag_for_wrt54g_og_wrt54gs/HairyDairyMaid_WRT54G_v22.pdf 

Flashing WRT54G(L) Step-by-Step

Configuring an OpenWRT Router

Configuring OpenWRT Step-by-Step

Configuring Freifunk Firmware  Using Freifunk Firmware on Linksys WRT54G or similar Wireless Router  Prerequisites:  Knowing how to flash and debrick  General IP networking basics, Network design

Configuring Freifunk Firmware (Config: System)  Click Admin > System  Host Name  Select Country  Restart

Configuring Freifunk Firmware (Config: Wireless)  WLAN Protocol: Static  WLAN IP address: As assigned in project – must be unique!  WLAN Netmask: As assigned in project  WLAN Default Route:  WLAN Mode: Ad-hoc  ESSID: e.g. “school08” - check spelling!  BSSID: e.g. 02:CA:FF:EE:BA:BE or anything you can remember and agree on! Must be the same for all nodes!  Lock the BSSID! Beware of cell splitting!  Channel - Make sure you all use the same!  Antenna mode: Auto  Apply and restart

Configuring Freifunk Firmware (Configuring: LAN)

Configuring Freifunk Firmware (Configuring: WAN)

References  Building a Rural Wireless Mesh Network - A DIY Guide:  © 2007, Wireless Africa Team of the Meraka Institute  For more information about Wireless Africa, visit us online at:

Q&A ??