VPN to FRITZ!Box from Linux

Requirements 
 
 Packages: vpnc, network-manager-vpnc und network-manager-vpnc-gnome 
 MyFRITZ!-address of the FRITZ!Box: 
 Example : pi80ewgfi72d2os42.myfritz.net 
 Username of the FRITZ!Box-User: 
 Example : Max Mustermann 
 Password of the FRITZ!Box-User: 
 Example : geheim1234 
 Shared Secret of the FRITZ!Box-User: 
 Example : Zj7hPCouK65IrPU4 
 
 Preparations 
 Setup MyFRITZ! 
 Register FRITZ!Box at MyFRITZ! for a fixed MyFRITZ!-address. Guide in German 
 Adjust the IP-Network of the FRITZ!Box 
 Setup the IP-Address for conecting with the FRITZ!Box: 
 
 Click on "Heimnetz". 
 Click on "Heimnetzübersicht". 
 Click on "Netzwerkeinstellungen". 
 Click on "IPv4-Adressen". If not visible, you have to activate the extended view. 
 Enter the IP-Address. 
 Save the settings. 
 
 Setup the VPN-Connecttion in the FRITZ!Box 
 Create an own user for every VPN-Connection: 
 
 Click on "System in the FRITZ!Box. 
 Click on "FRITZ!Box-Benutzer". 
 Edit the prefered user (or create a new one), and setup the vpn connection:
 
 Click on "Benutzer hinzufügen". 
 Enter the username and the password. 
 
 
 Activate the option "VPN". 
 Save the settings. 
 
 Setuo the VPN-Connection on your device 
 
 Start Advanced Network Configuration. 
 Click on the plus symbol and select ""Cisco-kompatibler VPN-Client (vpnc)" aus. 
 Enter the wanted Name. 
 Enter the MyFritz!-Address field(pi80ewgfi72d2os42.myfritz.net) in the "Gateway". 
 Enter the FritzBox!-Username and -Password and select the option "Passwort nur für diesen Benutzer speichern". aus und tragen Sie dann das Kennwort des FRITZ!Box-Benutzers (geheim1234) ein. 
 nter the FritzBox!-Username also in the field "Gruppenname" and select the option "Passwort nur für diesen Benutzer speichern". 
 Enter the "Shared Secret" aus und tragen Sie dann das "Shared Secret". 
 Click on "Extended". 
 Enter "tun0" as "Tunnel-Schnittstellenname". 
 Save the settings. 
 
 Quelle 
 Tutorial VPN zur FritzBox einrichten