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  1. L2TP/IPSec Linux Server Behind NAT

    In this blog we will learn how to install an L2TP/IPSec Linux Server behind NAT.

    IP Assignments

    • L2TP/IPSec Server IP: 192.168.42.190 / 24
    • L2TP/IPSec Client IPs: 192.168.42.191-199

    Kernel Parameter Tuning

    Add the following to /etc/sysctl.conf

    # ---------------- L2TP/IPSec (OpenSwan) ---------------
    net.ipv4 ...
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