Difference between revisions of "Vpn"

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(VPN (Virtual Private Network) connection)
m (VPN (Virtual Private Network) connection)
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''<b>Let op</b>: gebruikers van F-Secure moeten de [[vpn_F-Secure|Firewall configuratie aanpassen]] om blokkeren van GRE op te heffen.''
 
''<b>Let op</b>: gebruikers van F-Secure moeten de [[vpn_F-Secure|Firewall configuratie aanpassen]] om blokkeren van GRE op te heffen.''
  
''<b>Let op</b>: ALs de vpn verbinding direct weer wegvalt kan het zijn dat je de MTU waarde van de ethernetkaart lager moet zetten.
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''<b>Let op</b>: ALs de VPN-verbinding direct weer wegvalt, dan kan het zijn dat je de MTU-waarde van de ethernetkaart lager moet zetten. Zie bijvoorbeeld [http://portal.cyberpro.com.au/tips/Optimising_MTU.html optimizing MTU]''.
Zie bijvoorbeeld [http://portal.cyberpro.com.au/tips/Optimising_MTU.html optimizing MTU]''
 
  
 
Om gebruik te kunnen maken van de VPN-server heeft men een [[studenten_login_|login]] met bijbehorend wachtwoord voor de B-Faculteit nodig. Bezoek eventueel [http://dhz.science.ru.nl/ DHZ] (Doe Het Zelf).  
 
Om gebruik te kunnen maken van de VPN-server heeft men een [[studenten_login_|login]] met bijbehorend wachtwoord voor de B-Faculteit nodig. Bezoek eventueel [http://dhz.science.ru.nl/ DHZ] (Doe Het Zelf).  
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''<b>Note</b>: users of F-secure need to [[vpn_F-Secure|change the Firewall configuration]] to lift blocking of GRE.''
 
''<b>Note</b>: users of F-secure need to [[vpn_F-Secure|change the Firewall configuration]] to lift blocking of GRE.''
  
''<b>Note</b>: If the vpn connection immediately drops when you start to use it , it may be that the MTU value for the ethernet card is set to high, see for examle [http://portal.cyberpro.com.au/tips/Optimising_MTU.html optimizing MTU]''
+
''<b>Note</b>: If the VPN connection drops immediately when you start to use it , it may be that the MTU value for the ethernet card is set too high, see for example [http://portal.cyberpro.com.au/tips/Optimising_MTU.html optimizing MTU]''.
  
 
To use this VPN server you will need an [[studenten_login_|account]] with password for the Faculty of Science. Visit [http://diy.science.ru.nl/ DIY] (Do It Yourself).  
 
To use this VPN server you will need an [[studenten_login_|account]] with password for the Faculty of Science. Visit [http://diy.science.ru.nl/ DIY] (Do It Yourself).  

Revision as of 12:42, 7 February 2014

VPN (Virtual Private Network) connection

  • C&CZ manages a VPN server, which makes it possible for all users to gain secure/encrypted access to the network with their username/password. The computer at home (or anywhere on the Internet) becomes a part of the campus network. In this way users can get access to services that are normally only accessible from computers on campus.

The most common of such services are connecting to disk shares or special servers. To access your files on your home directory (U: Drive) you can follow this procedure.

For the use of the University library one does not need VPN, because the library has a proxy website, which can be used from anywhere on the Internet after logging in with your RU-password.

Examples of installation and configuration of the VPN:

Note: users of F-secure need to change the Firewall configuration to lift blocking of GRE.

Note: If the VPN connection drops immediately when you start to use it , it may be that the MTU value for the ethernet card is set too high, see for example optimizing MTU.

To use this VPN server you will need an account with password for the Faculty of Science. Visit DIY (Do It Yourself).

SSH SOCKS-Proxy to access journals (linux)

There is a convenient alternative to VPN or the UB proxy website described above to access online journals from anywhere. With SSH one can start a so called SOCKS Proxy-server, which can be used by web-browsers.

  • Login to your FNWI account with ssh:
 ssh -D 8942 lilo3.science.ru.nl       # (or any other login-server)
 (Enter password if required)

If your FNWI username (e.g. "peter") is different on your local username use:

 ssh -D 8942 -l peter lilo3.science.ru.nl

The -D flag starts "dynamic" application-level portforwarding. The port number (here 8942) can be any number above 1024 and below 65536. If a port is already in use by another process try a different number.

  • Tell the web browser to use the server. In Firefox:
 * Edit - Preferences - Advanced - Settings
 * Select "Manual proxy configuration"
 * SOCKS Host: localhost      Port: 8942
 * Select SOCKS v5
 * OK

If you now go to a journal website i.e., J. Chem. Phys., you should see "Your access is provided by: Universiteitsbibliotheek" and you should have the same access as from within the Radboud University domain.

Run ssh in the background

With these flags:

 ssh -f -N -D port 

ssh will run in the background (-f) and only setup the proxy server but not actually logon (-N).

Troubleshooting

The "netstat" command may be used to troubleshoot problems:

 netstat -at

will show all active and non-active tcp sockets. In the above example you should see something like:

 MYPC:/home/peter $ netstat -at
 Active Internet connections (servers and established)
 Proto Recv-Q Send-Q Local Address           Foreign Address         State      
 tcp        0      0 localhost:smtp          *:*                     LISTEN      
 tcp        0      0 localhost:8942          *:*                     LISTEN      
 tcp        0      0 *:ssh                   *:*                     LISTEN      
 tcp        0      0 localhost:ipp           *:*                     LISTEN      
 tcp        0      0 peter.home:36953        postvak.science.r:imaps ESTABLISHED
 tcp        0      0 peter.home:36808        lilo3.science.ru.nl:ssh ESTABLISHED
 tcp        0      0 localhost:smtp          *:*                     LISTEN      
 tcp        0      0 localhost:8942          *:*                     LISTEN