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Systems and methods for using a client agent to manage ICMP traffic in a virtual private network environment

  • US 7,907,621 B2
  • Filed: 08/03/2006
  • Issued: 03/15/2011
  • Est. Priority Date: 08/03/2006
  • Status: Active Grant
First Claim
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1. A method for using a client agent executing on a client to send ICMP messages to an appliance connected via a virtual private network, the method comprising:

  • (a) establishing, via a client agent executing on a client, a transport layer virtual private network (VPN) connection with an appliance;

    (b) intercepting, by the client agent at a network layer, an ICMP request originating from the client;

    (c) transmitting, by the client agent via the transport layer connection, the ICMP request to the appliance, the ICMP request comprising a destination address and a source address identifying the client;

    (d) determining, by the appliance, whether the destination address corresponds to a device having a VPN connection to the appliance; and

    (e) modifying, by the appliance, the source address of the ICMP request to identify an address routable back to the appliance if the destination address corresponds to a device not having a VPN connection to the appliance, and if the destination address corresponds to a device having a VPN connection to the appliance, responding by the appliance to the ICMP request on behalf of the device.

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