Nortel Networks Corporation

Avaya Inc.

Other

Xiangrong Cai

Richard H Crump

Haixiang He

Janet Doong

Shuching Shieh

Deepak Seth

Sasi Harpanahalli

A method and apparatus is disclosed by which IGMP Host messaging is translated to PIM messaging for the purposes of efficiently and accurately maintaining group membership data in a multicast network.

Protocol independent multicast designated router enhancements for supporting internet group management protocol in a multi-access network

Described is a method for statically or dynamically enabling a DVMRP router in a DVMRP domain to perform a reverse path forwarding check for an external source. A route report is generated for each known external source and injected into the DVMRP domain. Each route report includes routing information for a respective one of the known external sources. In one embodiment, the route report is generated for each network listed in a unicast routing table maintained on a DVMRP multicast border router and each route report includes unicast routing information for each of the networks and an indicator designating that the routing information is derived from unicast routing information. In another embodiment, if it is determined that routing information for an external source of multicast traffic received at a DVMRP border router is not available, the route report is generated at that time and includes a predetermined metric value.

DVMRP border router for reverse path forwarding validation with external sources

To detect an attack of a network connection, detection of a message containing a sequence number that is within a valid sequence number range is performed, where the message is intended to cause reset of the network connection. The message is dropped, and a counter is incremented to track a number of occurrences of receiving the message in response to detecting that the sequence number in the message is within the valid sequence number range.

Detecting an attack of a network connection

A router is configured with a static membership to a multicast group address and is capable of transmitting a message reporting the static membership to another router.

Extending router functionality to report static group membership

An apparatus and method of requesting retransmission of at least a portion of a message (having a plurality of message segments) from a sender utilizes message units in a memory device for storing data relating to retransmit messages. In particular, each message unit in the memory has data for one message segment. To that end, a retransmit message requesting retransmission of a set of message segments to a given receiver is received from the given receiver. The given retransmit message then is parsed to determine both the identity of the given receiver, and the identity of the set of message segments requested by the given receiver. A message unit then is produced in the memory for each of the set of message segments that does not have an existing message unit in memory. Data representing the identity of the given receiver then is added to all message units for the set of message segments.

Growing community of inventors

Billerica, MA, United States of America

Xiangrong Cai