Encryption on LAN-to-LAN VPNs

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    What kind of encryption is used when I select “Encryption” on a LAN-to-LAN VPN? I have a customer who wants to know what we are using.




    I do not know what is the default encryption used by OpenVPN to encrypt the data. In any case you can see the supported cipher with the command:

    openvpn –show-ciphers

    The following ciphers and cipher modes are available
    for use with OpenVPN. Each cipher shown below may be
    used as a parameter to the –cipher option. The default
    key size is shown as well as whether or not it can be
    changed with the –keysize directive. Using a CBC mode
    is recommended.

    DES-CBC 64 bit default key (fixed)
    IDEA-CBC 128 bit default key (fixed)
    RC2-CBC 128 bit default key (variable)
    DES-EDE-CBC 128 bit default key (fixed)
    DES-EDE3-CBC 192 bit default key (fixed)
    DESX-CBC 192 bit default key (fixed)
    BF-CBC 128 bit default key (variable)
    RC2-40-CBC 40 bit default key (variable)
    CAST5-CBC 128 bit default key (variable)
    RC2-64-CBC 64 bit default key (variable)
    AES-128-CBC 128 bit default key (fixed)
    AES-192-CBC 192 bit default key (fixed)
    AES-256-CBC 256 bit default key (fixed)

    After that, you could, for example, force the use of AES256 with the switch

    –cipher AES-256-CBC

    in the parameter field in both the VPN peers.


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