In the Windows 10 taskbar, click on the Windows icon. Then, click on “Settings” (the little gear icon). When the Windows Settings box appears on your desktop screen, click on “Network & Internet.” Then, in the left side panel, click on “VPN.”. For Windows 7, 8, 8.1, and 10. The Interface Our latest line of OpenVPN for Windows (OpenVPN Connect) software available for the major platforms features a new and improved user interface, making the experience of installing and using the OpenVPN for Windows software a snap.
Published on 12 Mar 2019 · Filed in Tutorial · 620 words (estimated 3 minutes to read)vpnc is a fairly well-known VPN connectivity package available for most Linux distributions. Although the vpnc web site describes it as a client for the Cisco VPN Concentrator, it works with a wide variety of IPSec VPN solutions. I’m using it to connect to a Palo Alto Networks-based solution, for example. In this post, I’d like to share how to set up split tunneling for vpnc.
Vpnc Windows 10 Download
Split tunneling, as explained in this Wikipedia article, allows remote users to access corporate resources over the VPN while still accessing non-corporate resources directly (as opposed to having all traffic routed across the VPN connection). Among other things, split tunneling allows users to access things on their home LAN—like printers—while still having access to corporate resources. For users who work 100% remotely, this can make daily operations much easier.
vpnc does support split tunneling, but setting it up doesn’t seem to be very well documented. I’m publishing this post in an effort to help spread infomation on how it can be done.
First, go ahead and create a configuration file for vpnc. For example, here’s a fictional configuration file:
All this information, naturally, has to reflect the correct configuration for your particular VPN setup. This is all reasonably well-documented on various vpnc tutorials. If you stop here, you’ll have a “regular” vpnc connection that will route all traffic across the VPN.
To do split tunneling, add this line at the end of your configuration file:
You can use whatever filename you want there (and put it wherever you want in the file system, although I prefer keeping it in /etc/vpnc). In the file you specified, add these contents:
The CISCO_SPLIT_INC value specifies how many networks are going to be configured to route across the VPN. In this example, there is only a single network being routed across the VPN. That network is provided by the CISCO_SPLIT_INC_0_ADDR, CISCO_SPLIT_INC_0_MASK, and CISCO_SPLIT_INC_0_MASKLEN entries, and in this case equates to 10.0.0.0/8.
If you have multiple/non-contiguous networks, then specify how many networks on the CISCO_SPLIT_INC line, and then repeat the lines above for each network, incrementing the number for each section. For two non-contiguous networks, you’d have a series of CISCO_SPLIT_INC_0_* lines (for the first network) followed by a set of CISCO_SPLIT_INC_1_* lines (for the second network).
The last line is important—this ties back to the script that comes packaged with vpnc to set up all the routing and such, as modified/directed by the values specified in your custom script. This allows you to customize the behavior of split tunneling on a per-connection basis.
Once you have your custom script in place, you can connect using sudo vpnc /etc/vpnc/config.conf (as normal). Once the connection is up, you can use ip route list to see that only the specified networks are being routed across the VPN. All other traffic still uses your local gateway.
Note that this solution does not address custom DNS resolver configurations. If you need to be able to resolve corporate hostnames and a DNS domain on your home LAN, additional steps are needed. I’ll try to document those soon (once I’ve had a chance to do some additional testing).
Find me on Twitter if you have questions, comments, suggestions, or corrections. Thanks!
Update 4 Feb 2021: For systems running resolvectl or the equivalent, I’ve found that adding CISCO_SPLIT_DNS=domain1.com,domain2.com,domain3.com to the custom script will configure the DNS search domains for that connection, which may help address situations where you need to resolve both local hostnames on your LAN as well as corporate hostnames.
Metadata and Navigation
Be social and share this post!
Related Posts
- Thinking Out Loud: DIY Network Virtualization?30 Aug 2013
- Technology Short Take 9827 Apr 2018
- Technology Short Take 8722 Sep 2017
OpenConnect just handles the communication with the VPN server; it doesnot know how to configure the network routing and name service on all thevarious operating systems that it runs on.
To set the routing and name service up, it uses an external scriptwhich is usually called vpnc-script. It's exactly the same script thatvpnc uses.You may already have a vpnc-script installed on your system,perhaps in a location such as /etc/vpnc/vpnc-script.
If you don't already have it, you can get a current version from here.Even if you already have a copy from vpnc, you may wish to install this updatedversion which has support for IPv6, and for running on Solaris and on newer Linuxkernels amongst other bug fixes.
Vpnc Windows 10 Pro
Note that the script needs to be executable, and stored somewherewhere SELinux or similar security systems won't prevent the root userfrom accessing it.
Current versions of OpenConnect (since version 3.17) are configuredwith the location of the script at build time, and will use the scriptautomatically. If you are using a packaged build of OpenConnect rather thanbuilding it yourself, then the OpenConnect package should have a dependencyon a suitable version of vpnc-script and should be built to look inthe right place for it. Hopefully your distributions gets that right.
If you're using an older version of OpenConnect, or if you want to usea script other than the one that OpenConnect was configured to use, youcan use the --script argument on the command line. For example:
- openconnect --script /etc/vpnc/vpnc-script https://vpn.example.com/
If OpenConnect is invoked without a suitable script, it will not be ableto configure the routing or name service for the VPN.
On Windows, the default configuration of OpenConnect will look fora script named named vpnc-script-win.js in the same directoryas the openconnect.exe executable, and will execute it with thecommand-based scripthost (CScript.exe).
The current version of this script can be found here.
Vpnc Windows 10
Note that although the script is basically functional forconfiguring both IPv6 and Legacy IP, it does not fully tear down theconfiguration on exit so stale IP address might be left around on theinterface.