L2TP Over IPSec VPN from Linux (any linux distribution)



  • Hi,

    I was having issues setting up the cited "network-manager-l2tp" client and I managed to solve this.

    Apparently, recent releases of Ubuntu won't allow to complete a L2TP/IPsec handshake because of 3des.

    When setting the Phase1 and Phase2 algorithms, add an exclamation mark at the end.

    For example:

    Phase1 algorithms: 3des-sha1-modp1024!

    Phase2 algorihms: 3des-sha1!

    Apparently, this forces the client to use insecure ciphers and therefore the handshake can proceed.


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