Posted on 2009-02-22
Last Modified: 2012-05-06

Please let me know in which interfaces are vpns created?

in loopback interfaces or ethernet interfaces?

Thx in advance
Question by:phoenix26
    LVL 58

    Accepted Solution


    A VPN could not be created using a loopback interface, since the connection would not actually connect to anything but the local computer. A VPN connecting to the local computer is pointless.

    VPN connections can be made over Ethernet networks, and this is the most common method by which you will find VPNs implemented.

    LVL 67

    Assisted Solution

    There are exceptions on some firewall devices. Sometimes loopback interfaces are used to maintain additional network addresses or security zones or similar. Viewing closely, they are not loopback interfaces, but virtual or pseudo interfaces.
    LVL 7

    Assisted Solution

    Mostly vpns are created to use the ethernet device (but they could easily be created over wlan/dialup etc) as transport but they use a specific type of device.
    for example openvpn uses "/dev/tunX" and "/dev/tapX", where as other vpns might use ppp0 for point to point.

    Author Comment


    IF vpns are created on ethernets?in which interfaces are ipsec and gre tunnels created?

    Thx in advance
    LVL 7

    Expert Comment

    tunnels will go "over" the ethernet or wan interface, possibly creating a virtual interface like /dev/tun
    but the actual traffic will go over the ethernet interface (just encapsulated)

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