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How can I download and install NetExtender on Linux?

11/02/2021 137 People found this article helpful 126,946 Views

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    Description


    SSL VPN is one of the common modes of VPN that allows a remote user to connect to the corporate network. While SSL VPN can be done via a web browser using https, a more common way is to use a ssl-vpn-client.

    Image

    Fig. 1. A compilation of SSL-VPN clients supported on contemporary operating systems. Officially supported Linux distributions are shown in Fig. 2.

    Fig. 2 is an excerpt from the man NetExtender (Linux man page on NetExtender), which compiles the compatibility list- appliances and OS. As can be seen it also requires a working pppd (ppp daemon).

    Image


    NOTE: Please note that Mac OS 10.12 and up do not support NetExtender.


    Resolution

    The present study is based on Element, which is a Ubuntu based distribution, installed as a virtual machine on Hyper-V in Windows 10 .

    Image


    Download

    1. Navigate to the SonicWall VPN Clients page at https://www.sonicwall.com/products/remote-access/vpn-clients/.
    2. Select NetExtender option and under Get NetExtender for Linux, select the desired version from the dropdown list. 
    3. Click Download.
      Image




    Extraction:

    • The downloaded NetExtender file was extracted using tar (Fig. 5) CLI utility. One may consider using a GUI utility offered in a distribution. It extracts a directory called NetExtender client.

      tar xzvf filename.tgz
      Image

    • Extracting the NetExtender.Linux.xxx.tgz file. The README file provides brief instructions.
      Image


    Installation

    NetExtender Client's GUI uses Java runtime. Therefore one has to install a Java Development Kit (JDK) and Java Runtime Environment (JRE). Without them, the NetExtender GUI will not be functional. However, one can still use it by the CLI commands, discussed later in this article. For the present study, only a JRE was installed.

    • Install JRE (Java Runtime Environment)

      sudo apt-get update
      sudo apt-get install default-jre
      Java -version
       Image

      NOTE: Java Runtime Environment (JRE). For the present study, openjdk was and Runtime were used.

    • Install NetExtender
      As suggested in the README file , NetExtender was installed by executing the install file . In the example, below the command was executed from inside the NetExtender client. If you are running the command from a different location, please update the appropriate file path.

      sudo ./install 
      ...
      Set pppd to run as root [y/N]? y 
      Image 

      NOTE: Installing NetExtender from the Package directory. Please notice the prompt Set pppd ... . One has to permit (y) NetExtender to run pppd as the root.


    Operation

    • From GUI
      One can use the NetExtender Icon from the Applications . Accessing this depends on the User Interface (UI) of the distribution.
      Image

      Operating NetExtender from the GUI control. A successful connection is indicated by the Status:Connected, Client IP, Sent, Received and Duration.


    • From CLI
      As pointed out that earlier, one may operate NetExtender from the CLI, which is also the only option if there is no JDK and JRE. NetExtender has a man page that can be accessed by man NetExtender .Image

      man NetExtender the manual page. Please notice that one can invoke NetExtender by the command NetExtender and provide the parameters interactively. Alternatively, the parameters can be supplied in line with appropriate switches: -u (user name) -p (password) -d (domain).
      Image

      Invoking NetExtender from the CLI. A successful connection provides a list of remote subnets accessible. Please notice that Control-C terminates an SSL-VPN session.

    Further reading:

    • How do I download and install NetExtender for Windows?
    • How do I download free SonicWall software?.

    Related Articles

    • Switch from the Policy mode to classic mode on Gen 7 appliances
    • Analyzing TCP reset(RST)packets
    • ‘Error sending one-time password’ encountered when connecting to NetExtender

    Categories

    • Firewalls > TZ Series > SSLVPN
    • Firewalls > NSa Series > SSLVPN
    • Firewalls > NSv Series > SSLVPN

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