seamless wifi VoIP handover

Picked this up on the Sveasoft forum

we have several hundred APs connected wirelessly covering an entire city with a seamless mobile network. These are all on the same SSID (non routed) and we can seamlessly roam everywhere up to about 55mph. We can do mobile VoIP with only a slight delay as the handoffs occur, but no calls are dropped.


more info on the city we covered is here: otawawireless

Numerical Electromagnet Code (NEC) Archives

This site contains several versions of NEC (Numerical Electromagnet Code) software, similar to that used by Poyting (SuperNEC)

www.freeantennas.com

This site contains the design, simulation and construction of several home-made wifi and other antennae

Wireless community networks around the world

Wireless community network - Wikipedia, the free encyclopedia

Now we just need to see an entry for Africa in there

Site with help on cross compiling

Bill Gatliff's Website

Finally a way to compile mobile mesh for Linksys

This shows how to create the C++ build environment on OpenWrt

Configuring IP Forwarding Policies

Configuring IP Forwarding Policies

Linux IP Masquerade HOWTO

Linux IP Masquerade HOWTO

Community Owned Information Network

Good link if you want to do IP forwarding between a private network (10.x.x.x or 192.168.x.x) and the internet

How to setup a router on linux

marlow.dk - Marlow@home

marlow.dk - Marlow@home: "Wireless Community WAN"

good link on setting up linux on linksys

how to build image from linksys source

My experience getting shell prompt on Linksys WRT54G

This amazing little cheap wireless router can be customized with a new version of linux or extra user applications by making use of a PING backdoor. The PING backdoor allows you to send commands to the box through a PING diagnostic command running from its httpd service.

Step 1:

Get the box connected your computer by plugging the supplied ethernet cable into a free network port on your PC and one of the 4 network ports on the Linksys (Not the port which is called internet)

Step 2:

Make sure the port you are using on your PC has DHCP enabled. Your machine will be given an IP address in the range 192.168.1.x. The Linksys is always 192.168.1.1 by default. Try to ping the Linksys box

#ping 192.168.1.1

Step 3:

Open a web browser (make sure your proxy is turned off or set a proxy exception for 192.168.1.1). Open the Linksys web administration page opening the following URL

http://192.168.1.1

Browse around here and check some its cool features.

Step 4:

Now it's time to test out the PING backdoor:

Go to the Administration - Diagnostic screen and click on PING
In the box "IP Address or Domain Name:", type

'ls>tmp/ping.log"

Wow - who would have thought you can execute commands on the box using PING - this backdoor will be exploited later to access the box and upload programs to it.

Step 5:

Download and configure the batbox installation

Batbox site (seems to be problem with dns at the moment)
Local site (alternative location)

Unzip this with

# gunzip < wrt54g-0.51.tar.gz.tar | tar xvf -

Look at the README file
Edit the script wrt54g.sh and make the following changes

PASSWORD=admin

If you have java installed you can leave the script as is If you don't have java but you do have wget installed uncomment the lines

# PROGRAM="wget --quiet ....
# EXTRA="" ....

if you don't have wget or java installed make sure you install these If you are using cygwin: MAke sure ttcp is installed and copy the ttcp program from /usr/bin to the current wrt54g directory

Step 6:

Execute the script # ./wrt54g.sh After the script executes, you should be able to telnet to the box # telnet 192.168.1.1

The script also installs a new page on the web server, access it by going to the following URL

http://192.168.1.1:8000/

Step 7:

Get the cross compiler tools for MIPS from

Batbox site

and start compiling and testing your own applications ...
soon to follow - instructions and transferring your own application - will be based on the batbox script

Ad hoc protocols implementations - Wikipedia

List of all implementations of ad hoc protocols

Ad hoc protocols implementations - Wikipedia

Ad Hoc Networking Links

Good list of links including simulators

Ad Hoc Networking Links

Ad hoc protocol list - Wikipedia, the free encyclopedia

Full list of all ad-hoc protocols - scary if we need to work through all of these

Ad hoc protocol list - Wikipedia, the free encyclopedia

DAKnet a wireless store and forward solution in India

Interesting way of getting access to rural areas without the use of fixed access points. Information is stored and forwarded when the mobile access point vehicle drives past.

Media Lab Asia -- Research

Mesh, IP allocation and IP Routing

One of the ourstganding issues amongst the mesh gurus is the issue of IP allocation. The general approach is to assign each person in the mesh a staic Ip in the 10.x.x.x or 192.168.x.x range. The ideal is to give everyone a generic box - they install it, turn it on, and it automatically gets assigned an IP, updates it's routing table based on the mesh routing algorithm being used, gets a gateway and a dns (basically like DHCP)

Here is a discussion about handing out IP's between networked PC's with multiple hops

[BAWUG] Mesh, IP allocation and IP Routing

Wireless community network - definition

Good definitition with complete list of wireless community network activities in North Ameria, Europe and Australia

Wireless community network - Wikipedia, the free encyclopedia

Nice site with WiFi antenna summaries - Cisco

Cisco antennas summary

Cisco Aironet Antenna Reference Guide-Cisco Aironet Antennas and Accessories - Cisco Systems

MIT mesh networking home pages

This describes their grid project

The Grid Ad�Hoc Networking Project

This describes their outdoor rooftop network

MIT Rooftop

Let's download their software and test it

MIT software