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A method, system, and computer program product for detecting the type of NAT firewall using messages provides the capability to determine the type of NAT in use without requiring special purpose hardware or software. A method for determining a type of a NAT firewall may comprise receiving a message from a device inside the NAT firewall, the message addressed to a first IP address and port of a device outside the NAT firewall, transmitting a plurality of messages to the device inside the NAT firewall, at least one of the plurality of messages addressed from the first IP address and port and at least one of the messages addressed from a second IP address and port, receiving responses to at least some of the plurality of messages transmitted to the device inside the NAT firewall and determining the type of the NAT firewall based on the received responses.

Titel:	DETECTING THE TYPE OF NAT FIREWALL USING MESSAGES
Autor/in / Beteiligte Person:	Smelyansky, Vladimir ; Grinberg, Victor
Link:	Zum Volltext
Veröffentlichung:	2010
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20100218246 Publication Date: August 26, 2010 Appl. No: 12/709963 Application Filed: February 22, 2010 Assignees: XCAST LABS, INC. (Northfield, IL, US) Claim: 1. A method for determining a type of a NAT firewall comprising: receiving a message from a device inside the NAT firewall, the message addressed to a first IP address and port of a device outside the NAT firewall; transmitting a plurality of messages to the device inside the NAT firewall, at least one of the plurality of messages addressed from the first IP address and port and at least one of the messages addressed from a second IP address and port; receiving responses to at least some of the plurality of messages transmitted to the device inside the NAT firewall; and determining the type of the NAT firewall based on the received responses. Claim: 2. The method of claim 1, wherein the device inside the NAT firewall is an IP phone or ATA device. Claim: 3. The method of claim 1, wherein the message received from the device inside the NAT firewall is a SIP REGISTER message. Claim: 4. The method of claim 1, wherein at least one of the plurality of messages transmitted to the device inside the NAT firewall is a SIP OPTIONS message. Claim: 5. A computer program product for determining a type of a NAT firewall comprising a computer readable storage medium and computer program instructions, recorded on the computer readable medium and executable by a processor, for performing the steps of: receiving a message from a device inside the NAT firewall, the message addressed to a first IP address and port of a device outside the NAT firewall; transmitting a plurality of messages to the device inside the NAT firewall, at least one of the plurality of messages addressed from the first IP address and port and at least one of the messages addressed from a second IP address and port; receiving responses to at least some of the plurality of messages transmitted to the device inside the NAT firewall; and determining the type of the NAT firewall based on the received responses. Claim: 6. The computer program product of claim 5, wherein the device inside the NAT firewall is an IP phone or ATA device. Claim: 7. The computer program product of claim 5, wherein the message received from the device inside the NAT firewall is a SIP REGISTER message. Claim: 8. The computer program product of claim 5, wherein at least one of the plurality of messages transmitted to the device inside the NAT firewall is a SIP OPTIONS message. Claim: 9. A system for determining a type of a NAT firewall comprising a processor operable to execute computer program instructions, a memory operable to store computer program instructions executable by the processor, and computer program instructions stored in the memory and executable to perform the steps of: receiving a message from a device inside the NAT firewall, the message addressed to a first IP address and port of a device outside the NAT firewall; transmitting a plurality of messages to the device inside the NAT firewall, at least one of the plurality of messages addressed from the first IP address and port and at least one of the messages addressed from a second IP address and port; receiving responses to at least some of the plurality of messages transmitted to the device inside the NAT firewall; and determining the type of the NAT firewall based on the received responses. Claim: 10. The system of claim 9, wherein the device inside the NAT firewall is an IP phone or ATA device. Claim: 11. The system of claim 9, wherein the message received from the device inside the NAT firewall is a SIP REGISTER message. Claim: 12. The system of claim 9, wherein at least one of the plurality of messages transmitted to the device inside the NAT firewall is a SIP OPTIONS message. Current U.S. Class: 726/11 Current International Class: 06

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DETECTING THE TYPE OF NAT FIREWALL USING MESSAGES