Avaya Inc.

Ciena Corporation

Avaya Management L.p.

Dusan Mudric

Ping Lin

Peter Musgrave

Martin Vuille

Wai-Hung Leung

A system and method for intelligently detecting a duplicate address attack is described. The system and method comprise transferring a first address conflict check message; receiving a first address conflict check response message; performing intelligent Duplicate Address Detection (DAD) to determine if the duplicate address attack is valid; and if the duplicate address attack is valid, then reporting the duplicate address attack to a monitoring server. An intelligent switch that detects the DAD attack blocks further address conflict check response messages from the attacker's MAC address.

Method and system for discovering, reporting, and preventing duplicate address detection attacks

Systems and methods include determining if a destination address for a destination host is on-link; when the destination address is on-link, negotiating and selecting a Link-Local (LL) source address and a LL destination address that is on-link; and, when the destination address is not on-link, utilizing an address for the destination host separate from LL addresses. The destination host can be a multi-homed host. The negotiating and selecting and the utilizing are based on a plurality of rules performed in order. The plurality of rules are defined in RFC 6724, September 2012.

Least common scope address selection systems and methods

A method, system, device, or apparatus for selecting an IP address for a message. The method, system, device, or apparatus is used when there are two or more IP addresses for a multihomed device. The method determines an IP address reachable from a destination for the message. The message is generated using the reachable IP address as the hostname of the multihomed device. The generated message is transferred to the destination.

System log messages hostname address selection by multihomed hosts

A method of engineering media path selection is described. Addresses and media paths are selected using a media path selection policy. Additionally, a candidate address list may be considered. Using the media path selection policy, devices may select the first hop egress router and a remote default router for transferring data.

Media path engineering for multi-homed devices

Examples disclosed herein provide methods and systems for selecting Internet Protocol addresses for Session Initiation Protocol (SIP) communications. In at least one implementation, a method of operating a communication network utilizing a session initiation protocol (SIP) is provided. The method performed within a second communication device includes receiving a SIP invite from a first communication device, and determining a source IP address for the second communication device, using an IP address for a third communication device as a destination address within a source address selection algorithm (SASA) function. The method further includes adding a Via header within the SIP invite to include the SASA determined source IP address for the second communication device, adding a Record-Route header within the SIP invite to include the SASA determined source IP address for the second communication device, and transferring the modified SIP invite to the third communication device.

Internet protocol address selection in session initiation protocol communications

Embodiments disclosed herein provide systems, methods, and computer readable media for extending the lifetime of a network address when an address system is unavailable. In a particular embodiment, a method provides, upon determining that a first network address for a network element has reached a preferred lifetime for the first network address, transitioning the network element to an extended rebind state that allows the first network address to remain in the preferred state. While the network element is in the extended rebind state, the method provides attempting to contact an address system and determining whether a second network element is assigned the first network address. The method further provides maintaining the first network address in the preferred state and the network element in the extended rebind state until contact is made with the address system or the second network element is determined to be assigned the first network address.

Extending network address lifetime when address system is unavailable

Examples disclosed herein provide methods and systems for selecting Internet Protocol addresses for Session Initiation Protocol (SIP) communications. In at least one implementation, a method of operating a first communication device includes applying a source address selection algorithm to determine at least one source Internet Protocol (IP) address for the first communication device, and transferring a communication invite that indicates the at least one source IP address. The method further provides, receiving, from a second communication device, a response to the invite that indicates at least one IP address for the second communication device, applying SASA to the at least one IP address to determine a third source IP address for the first communication device, and initiating a communication with the second communication device using the third source IP address.

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Ottawa, Canada

Dusan Mudric