Internet Access

The prerequisite for using the internet at Marburg University is an internet account for students. As soon as you are enrolled at Marburg you will receive one automatically. Enrollment happens after your arrival. After a couple of days you can log on for the first time, set your password and use your own device or the computers in the labs on campus.

In your room

Each dorm has an internet tutor. Any questions concerning internet access in your room should first be directed to them. You will find an overview of the tutors here.

UMRnet/Internet access

Internet access is possible with several Windows versions. It also works with Linux, MacOS and other system softwares. Please have the MAC address of the Ethernet interface of your laptop ready when you come here.

Access via telephone network

In the two dorms without LAN access you would have to order a conventional telephone network at the "Deutsche Telekom" with a DSL or ISDN/Modem option. Because of the shortness of your stay we can not recommend this alternative. Unnecessary expenses for the telephone extension arise.

On campus

Using LAN

Almost all institutions on campus are equipped with so-called cable networks where you can hook up your laptop. The laptop is to be used as a "client". The use of servers (especially WWW-/MP3-Upload-Server) is strictly forbidden. Your internet account will be blocked at misuse.

The usage is temporary (maximal 4 hours), the IP address will be assigned dynamically. Access information will be recorded like using a modem/ISDN access. The information will be kept for a maximum of six months.

For the LAN access via laptop at the University the HRZ (data processing center) operates a LAN access server (Cisco Router); in addition the server also controls the computer access in the dormitories and is connected to the UMRnet by Gigabit-Ethernet (1 Gbit/s, fullduplex). For the utilisation of the LAN access the laptop owner has to sign on to this server.

Requirements

The laptop has to have an integrated (PCMCIA-) Ethernet- Adapter for Twisted-Pair-Access (with RJ45-nut) and installed driver:

the Ethernet adapter is configured for data transfer with 10 Mbit/s half-duplex (Media Type: 10 Base-T)
with Windows 95 und 98 (1st edition): net protocols is added
with Windows 95, 98, ME, 2000 and XP: the TCP/IP-features are configured on "IP-Adresse automatisch beziehen"
with Windows NT: at the configuration of TCP/IP you will be asked, whether “DHCP verwendet werden soll” – "JA"
with Windows XP: no "Netzwerkbrücke" is installed
a Telnet-programme on the laptop
Internet-account (username, password)
UMRnet-connection nut with Twisted-Pair-Connecting cable marked with “"Laptops Studierende" or just "Laptops"

For further information and help with problems, please contact the person in charge at the HRZ.

Instructions

The Twisted-Pair-Connection cable, which is available on an UMRnet-port for laptops and marked thus, has to be connected to the laptop’s Ethernet- dapter.

Then:

Start the laptop or re-boot it; it will be assigned an IP-address dynamically among other things
Start a Telnet-session for LAN access Server for laptops, e.g. in the MS-DOS-prompt with telnet lanzug.uni-marburg.de or telnet 137.248.74.250
Type in the information demanded (username and password of your personal internet account) - the Telnet session will be closed at the same moment. In its stead, a window will appear with the message "Verbindung zum Host verloren". This has to be approved with "OK". The LAN access to the UMRnet will be activated.

Hint

If the user tries to log in a second time after a successful logon following message will show up: "ACCL#133 already contains this address pair". This is not an error message, but it means that the user logged in successfully and can use the access now. Now any TCP/IP-Client-Application (such as web browser, Email-program, Telnet, SSH, FTP, News, IRC amongst others) can be started. The LAN access for the laptop will be locked 4 hours after connecting, or 5 minutes after no further data has been sent from the laptop to the UMRnet; after that the user has to login with Telnet at the LAN-access-server again.

Using WLAN

Requirements

Your laptop has to be equipped with a wireless adapter (WLAN card). You need your university internet account and a laptop with onboard or PCMCIA-) wireless adapter including the driver software:

wireless adapter according the IEEE Standard 802.11b/g (11Mbit/s as the case may be 54 Mbit/s in 2,4 GHz-range) and/or 802.11a (54 Mbit/s in 5 GHz-range) as well as support of the WPA- safety standard of the Wi-Fi-Alliance
support of the authorization standard IEEE 802.1x via system software
support of the authorization protocol EAP-TTLS via a special client-software (e.g OpenSource-product SecureW2)
DFN root certificate (encoded)
for Windows 98, ME 2000 and XP: TCP/IP-features have to be preset to "IP-Adresse automatisch beziehen"
The laptop has to be located in the range of a hotspot; where you will find such a hotspot in the University please see below.

Definitions:

IEEE: Institute of Electrical and Electronics Engineers (organisation of standardization)
Wi-Fi Alliance: consortium
WEP: Wired Equivalent Privacy (does not apply as safe anymore)
WPA: Wi-Fi Protected Access (succession to WEP, subset of IEEE 802.11i)
IEEE 802.11i: standard for a safe wireless transmission
IEEE 802.1x: authorization standard with different authorization protocols (amongst others EAP- TTLS)
EAP: Extensible Authentication Protocol
TTLS: Tunnelled Transport Layer Security

Instructions

Switch on your laptop and activate your wireless adapter. Make sure the following parameters are adjusted:

Internet protocol (TCP/IP): source IP-address automatically
network-SSID: UMRnet_students
authorization of the network via 802.1x and EAP-TTLS-PAP
encryption with WPA/TKIP
for EAP-TTLS available DFN Top level certificate (in German)

Now connect to WLAN (SSID UMRnet_students) and enter your username (start with capital letter!) and password.

After successful authorization your laptop receives a generated IP address automatically. Now you can use any TCP/IP-Client application (e.g. web browser, Email program, SSH, FTP amongst others). The Internet-connection will be cut if you move out of the reach of the hotspots. You will have to go back to the hotspot and authorize yourself again.

Step-by-step instructions:

(Further instructions in progress for Linux, Windows PDA, Installaton of DFN certificate under Windows XP)

Active hotspots

Policies

The WLAN access for laptopsis integrated in the Internet access and is subject to the user regularities. Thereby

- the laptop may just be used as client and for duties which are listed in § 2 paragraph 1 of the user regularities
- the operation of servers as WWW-/MP3-Upload-Server is strictly forbidden
- the Internet-account will be blocked at misuse

The IP address will be referred automatically. Connection data as e.g. username, IP-address, date/time of the session, transmitted data volume will also be recorded and kept safe for six months.

Only authorized users gain access to the WLAN. The data transfer may not be tapped, and especially the username/password may not be transmitted in plain text.