Comments on L2TP over IPsec using OpenSwan with Freeradius authentication on Ubuntu 16.04

This article is about the layer 2 tunneling protocol (L2TP) with IPsec to provide end-to-end encryption in the layer 2 VPN. The open source implementations of IPsec are StrongSwan and OpenSwan, both are supported on all Linux distributions. In this tutorial, OpenSwan is used to provide the security channel for L2TP VPN.

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By: Koushik Chatterjee
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Hi All,

Thanks for sharing this awesome Documentation. I really like it. Someone please tell me on iptables section in details. I can't understand on that section.

By: Eko Prasetyo
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Nice documentation. Keep sharing  ...

By: steven
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I'm getting the following error when trying to connect VPN from the android phone.

Oct 18 14:10:47 modem-ThinkPad-W550s kernel: [12181.422625] [UFW BLOCK] IN=enp0s25 OUT= MAC=54:ee:75:42:cf:63:e8:91:20:c1:a8:f2:08:00 SRC=192.168.1.252 DST=192.168.1.249 LEN=136 TOS=0x00 PREC=0x00 TTL=64 ID=47290 DF PROTO=ESP SPI=0x96ca7e7c