Methods and apparatus for inserting data into a communications session

A method for inserting data into packets associated with a communications session over a network between a first computer and a second computer, the method comprising:

• receiving a first packet transmitted over the network from the first computer to the second computer, the first packet being associated with the communications session;
• inserting a first amount of extra data into the first packet to alter an original size of the first packet;
• forwarding the first packet including the first amount of extra data over a second portion of the network to the second computer;
• receiving a second packet being propagated from the second computer to the first computer in the communications session, the second packet including acknowledgment information acknowledging receipt of the first packet by the second computer;
• adjusting the acknowledgment information in the second packet based upon the first amount of extra data inserted into the first packet, where the adjusting includes subtracting a value equal to the first amount of extra data from sequence information stored in the acknowledgement information;
• and
• forwarding the second packet including the adjusted acknowledgment information to the first computer such that the first computer receives the adjusted acknowledgment information, the adjusted acknowledgment information indicating that the second computer received the first packet without any of the first amount of extra data.

A computer program product having a computer-readable medium including computer program logic encoded thereon that, when performed on a processor in a computerized device having a coupling of a memory, a processor, and at least one communications interface provides a method for inserting data into packets associated with a communications session between a first computerized device and a second computerized devices by causing the computerized device to perform the operations of:

• receiving a first packet including original data being propagated from the first computer device to the second computer device for the communications session;
• inserting a first amount of extra data into the first packet to alter the size of the first packet;
• forwarding the first packet including the first amount of extra data to the second computer device;
• and
• in response to receiving an acknowledgment message from the second computer device that the second computer device received the first packet including the original data as well as the first amount of extra data, adjusting sequence information stored in the acknowledgement message by subtracting a value equal to the first amount of extra data from the sequence information stored in the acknowledgement message, transmitting a message to the first computer device indicating that the second computer device received the first packet, where the message comprises the modified acknowledgement message.

A data communication device disposed in a network at a remote location with respect to a first computer device and a second computer device, the data communication device including:

• means for receiving a first packet including original data, the first packet being propagated from the first computer device over the network through the data communication device to the second computer device;
• means for inserting a first amount of extra data into the first packet to alter the size of the first packet;
• means for forwarding the first packet including the first amount of extra data to the second computer device;
• and
• means for transmitting a message to the first computer device indicating that the second computer device received the first packet without providing any indication in the message that the data communication device inserted the first amount of extra data into the first packet received by the second computer device and that the second computer device received the first amount of extra data, wherein transmitting the message occurs in response to receiving an acknowledgment message from the second computer device that the second computer device received the first packet including the original data as well as the first amount of extra data,
• means for adjusting sequence information stored in the acknowledgement message by subtracting a value equal to the first amount of extra data from the sequence information stored in the acknowledgement message.

A method comprising:

• forwarding contents of a first packet received from a first computer device over a first network path to a second computer device over a second network path;
• receiving a second packet from the first computer device over the first network path;
• adjusting sequence information stored in the second packet to account for a first amount of extra data added into the first packet prior to being forwarded over the second network path to the second computer device, the first amount of extra data being added to the first packet from a source other than the first computer device, where the adjusting includes:
• i. subtracting a value equal to the first amount of extra data from the acknowledgment information stored in the return packet;
• ii. forwarding the return packet including modified acknowledgment information to the first computer device, the steps of subtracting and forwarding are performed to prevent the first computer device from learning that the first amount of extra data was added to the first packet prior to being forwarded to the second computer device;
• forwarding the second packet including the adjusted sequence information over the second network path to the second computer device;
• after forwarding the first packet to the second computer device, receiving a return packet over the second network path from the second computer device for transmission over the first network path to the first computer device, the return packet at least in part acknowledging receipt of the contents as well as the first amount of extra data;
• and
• prior to forwarding the return packet to the first computer device, modifying acknowledgment information in the return packet.

A data communication device disposed in a network between a first computer device and a second computer device, the data communication device comprising:

• at least one communications interface;
• a memory;
• a processor;
• and
• an interconnection mechanism coupling the at least one communications interface, the memory, and the processor;
• wherein the memory is encoded with a manager application that when performed on the processor, produces a manager process that causes the data communication device to support operations of:
• receiving a first packet including original data being propagated from the first computer device to the second computer device for a communications session;
• inserting a first amount of extra data into the first packet to alter the size of the first packet;
• forwarding the first packet including the first amount of extra data to the second computer device;
• and
• in response to receiving an acknowledgment message from the second computer device that the second computer device received the first packet including the original data as well as the first amount of extra data, adjusting sequence information stored in the acknowledgement message by subtracting a value equal to the first amount of extra data from sequence information stored in the acknowledgement message, transmitting a message to the first computer device indicating that the second computer device received the first packet, where the message comprises the modified acknowledgement message.