Linux – Cisco VPN Access

Installing VPNC

The required vpn client software is called: vpnc

To install execute the following command on your Ubuntu / Debian Linux. For others it might be different.

sudo apt-get install vpnc

Configuring VPNC

To get access to your cisco IPSEC Tunnel enter your login credentials.

Create your config file e.g.: /etc/mysrv.vpnc

IPSec gateway gateway.to.use
IPSec ID groupname
IPSec secret passwordforgroup
Xauth username myusername
Xauth password mypassword

If you decide to include your password in the configuration file, then take the necessary precautions (e.g. `chmod 600 /etc/vpnc.conf`).

Unprivileged VPNC with Sudo

If you want to allow a user to connect to the network, but not use a startup script; I recommend to modify the sudoers file.  Using the `visudo` editor.  Now, just add this line to your sudoers file (using visudo):

username    hostname    =   NOPASSWD:/usr/bin/vpnc,/usr/bin/vpnc-disconnect

Now, your specified user can start the vpn client with the following statement: `sudo vpnc`, and stop it with `sudo vpnc-disconnect`.

Aliasing VPNC

Using aliases can make your life even easier. The user can add the following lines to his `~/.profile` file to simplify commands requiring the school’s network.

alias vpnc="sudo vpnc"
alias vpnc-disconnect="sudo vpnc-disconnect"
alias vpnc-home="sudo vpnc /etc/mysrv.vpnc"

	    

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