Usage: save # this file as `vpn`, `chmod +x` it, and run `./vpn ` as root. #!/usr/bin/env bash # Enables or disables a client connection to an L2TP/IPsec VPN. Install Openswan for IPsec and xl2tpd for L2TP: Your user account on the VPN server is johndoe with password j0hn5p455w0rd. Let’s say you want to connect to a VPN server with public IP address 68.68.32.79 and shared secret sh4r3ds3cr3t. This allows the use of Libreswan and NetworkManager, although on Arch Linux I also had to sudo mkdir -p /var/lib/ipsec/nss since that directory wasn’t created during Libreswan installation (?!) Walkthrough Update : A less-than-ideal but much easier fix is to build xl2tpd from source with one problematic line commented out. The initial 10-minute setup is pretty tedious, but once you’ve got it working you can throw it all into a script and never worry about it again. Here’s a fully working solution at the time of writing. pre-shared key) authentication, but every online guide I could find was inaccurate and/or incomplete. I needed to connect a Linux client to an L2TP/IPsec VPN using shared secret (a.k.a. Connecting to an L2TP/IPsec VPN from Linux
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