Motorola Corporation

Kwan Wu Chin

Raad Raad

John Thomas Judge

A dual-stack host () is provided on a multicast network () using first and second protocols (). The dual-stack host () detects a first multicast request from a source host () to a destination host () using a first protocol. The dual-stack host () initiates a timer. When the timer expires, the dual-stack host () sends a second multicast request message to the destination host () using each of the first and second protocols. The dual-stack host () monitors whether the destination host () responds using one or both of the first and second protocols and determines whether protocol translation is necessary to allow the source and destination hosts to communicate. If required, the dual-stack host () then invokes protocol translation to provide the source host () with a synthesized address for communicating with the destination host ().

Invoking protocol translation in a multicast network

A method (), a system and a gateway () for communicating between hosts in private networks having IPv4 address spaces are disclosed. One or more DNS query messages for resolving resource records are transmitted () from a first private network for a remote host in a second private network. One or more DNS replies comprising a private IPv4 address for the remote host are received (). If the one or more DNS replies comprise a synthesized IPv6 address, the IPv6 address is extracted from the replies and a peer IPv4 address in the first network is allocated for the remote host (). The IPv6 address comprises a global IPv6 prefix and the private IPv4 address for the remote host. The peer IPv4 address is associated with an extracted IPv6 address for the remote host. The remote host is addressed using the IPv6 address for transmission of IPv4 packets from the first network addressed using the peer IPv4 address (). The system comprises an application-level gateway of a domain name system (DNS-ALG), a virtual table, and a translator. The gateway comprises the foregoing system and a domain name system (DNS) server.

Inter private network communications between IPv4 hosts using IPv6

Wireless sensor platforms (), when deployed, can ascertain whether they can meaningfully participate in communications with more than one cluster () of such devices. When true, such multi-cluster platforms can serve as bridge nodes to facilitate the passing of data collected from one cluster to or through another cluster. In a preferred embodiment, the platforms serving as bridge modes (and) utilize a communication schedule that imposes no greater work load than the load the platform would otherwise have served as an ordinary node, and preferably the workload is considerably reduced. This aids in ensuring that the portable power reserves of the bridge nodes will support bridge operations for at least as long as the clusters are otherwise functioning.

Growing community of inventors

Dulwich Hill, Australia

Kwan Wu Chin