Test MAC authentifaction of a WiFi access point.

When a new WiFi access point is set up several security relevant configuration options have to be changed. First password authentication through WPA/PSK is enabled. Additionally MAC address authentication can be enabled to provide access only to certain machines which have thir MAC address entered in a list of known MAC addresses. The goal is to test if this feature was correctly enabled.

Connect to wlan via vpn under Ubuntu 9.04

<p>To connect to the internet via vpn and wlan you first have to get an ip address from the wlan accesspoint. After this you can build up the vpn tunnel and register yourself in one step. This is safe and comfortable if you are working at your workplace. With Windows XP (SP3) this works without problems.</p><p>But when I use Ubuntu 9.04 I cannot connect to the server to register. On the TU I can only receive an ip address, open a browser an type my username and password in the login-field. This does not seem to be very secure due to the fact that the connection is not encrypted when sending this information. Interestingly the connection from home to the vpn-server (which has another ip than the first one) works fine without problems.</p>

Install / Configure access point

First of all there is an internet connection and the essential hardware needed (wlan router).After you have connected the wlan router. The first challenge is to find out the IP adress of the access point. Often it is written in the manual. If you don't find it, the manufacturer often use If your computer system has the IP e.g. you have to change the IP to till 254. Now you open an internet browser, e.g. IE or Firefox and put the IP adress of the access point. For a secure connection you activate the SSID, by writing WL03 into the text field. Then you enable WEP (Wired Equivalent Privacy). In the slide "Advanced" you put MAC adresses, usually the MAC of the own computer system. Here you say that only the computer system with that MAC is able to access and use the wlan. Now it should be able to have wireless internet connection.

configure an access point

<p>Last time I wanted to install / configure my wlan router at home. Because I have never done it, it was a really challenge for me. However I did it.</p>

Install D-Link DWL-650+ WLAN Device under Linux - Solution madwifi

Well, there is no perfect solution for WLAN-Devices with various Linux distributions. However I did find a solution that seems to work pretty well with the Fedora distribution and the DWL-650+ WLAN Device. The only two drivers that I did find (and are working somehow) are madwifi and acx. The acx firmware/driver works only with a Kernel 2.6.10 and higher and doesn’t seem to be stable at all (also the installation is a little tricky). Sometimes I am able to connect to a network sometimes not and therefore it is not the solution I was looking for. The madwifi drivers on the other hand did work without flaws and installation was also quite easy (on fedora you need kernel-devel and sharutils). With a nice GUI you have not to deal with all the config-files and can easily set up your wireless network.

For further details see: http://www.hauke-m.de/w-lan/madwifi/


Sharing Internet via Mac OS Leopard to other computers

<p>This is probably a most frequent challenge for Mac users as many students in Vienna are using Internet connection form Chello at their home. It is not possible to several computers at the same time to connect to a modem. When using a Mac Computer, you may connect to the Internet only through ethernet slot. Moreover, you will need to register your computer's ethernet-ID with your provider (Chello) in order to access Internet. It is different when using Windows, where users can simply just install required modem driver to a computer. When using Windows,there is no difference in kind of computer one uses. What is needed is to only install a modem driver. Whereas on Mac OS, it will not be sufficient, because your Internet access is only valid to that computer, which Ethernet-ID is registered to Chello (Internet provider).</p>

Using WLAN in TU Dresden

To use wireless in TU Dresden users have to install additional software on theirs laptop.
For Windows platform you have to download The SecureW2 Eap Suite from their website (http://www.securew2.com/products/) and install it on your computer, moreover you have to download
Intel PROSet/Wireless Tool if you don’t have it on you computer.
Additionally Windows XP users should make sure that they have SP2 installed.
After that they can configure their wireless access with their current university login and password.

Install D-Link DWL-650+ WLAN Device under Linux

For some old WLAN cards like DWL-650+ from D-Link no official drivers for Linux has been released. Furthermore during the installation process the card cannot be installed. There exist some third party device drivers that support those devices, but these are hard to find and often doesn’t work very well. Especially, the DWL-650+ causes problems in combination with Fedora 8. Sometimes it seems to work and sometimes it doesn’t.

How use to get acces to WLAN in TU Dresden eduroam network.

TU Dresden provides a wireless network with high speed that covers nearly the whole TU campus. However a lot of new, especially foreigner students face the problem that they cannot connect to this network with their current University login and password.

WLAN access by eduroam

eduroam (education roaming) is an European project to support mobility of researchers and students by giving Internet access at participating universities for all those that have at one university an account. The Vienna University of Technology as a partner in this projects offers eduroam through all hotspots. With my existing account and my password I can authorize at eduroam for an unlimited period of time. I will be connected automatically if a hot spot is in reach. This means of course also if I am going to an another university in Austria or abroad I will have free Internet access (also with my labtop).


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