Multicast routing method and apparatus for routing multicast packet

• US 7,860,094 B2
• Filed: 09/17/2008
• Issued: 12/28/2010
• Est. Priority Date: 07/21/2000
• Status: Expired due to Fees

• Current Assignee: Alaxala Networks Corporation (Fortinet Inc.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Tsuchiya, Kazuaki, Higuchi, Hidemitsu, Sawada, Sunao, Nozaki, Shinji
• Primary Examiner(s): Ngo, Ricky
• Assistant Examiner(s): PATEL, CHANDRAHAS B
• Application Number:
  US12/212,044
• Publication Number:
  US 20090016345A1
• Time in Patent Office: 832 Days
• Field of Search: 370/390, 370/389, 370/392, 370/401, 370/432
• US Class Current: 370/390
• CPC Class Codes: H04L 12/18 for broadcast or conference , e.g. multicast
• CPC Class Codes: H04L 12/185 with management of multicast group membership
• CPC Class Codes: H04L 45/04 Interdomain routing, e.g. hierarchical routing
• CPC Class Codes: H04L 45/16 Multipoint routing
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/251 between different IP versions
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/167 Adaptation for transition between two IP versions, e.g. between IPv4 and IPv6 translation of Internet protocol [IP] addresses H04L61/2503

Abstract

A communications apparatus for converting an IPv4 multicast packet transmit from an IPv4 terminal into an IPv6 multicast packet and transmitting the converted IPv6 multicast packet to one of a plurality of IPv6 networks. The communications apparatus has information indicating to which IPv6 network the IPv4 multicast packet to undergo conversion processing is to be transmitted. The communications apparatus then converts the received IPv4 multicast packet into an multicast packet and transmits the converted IPv6 multicast packet to an IPv6 network where it is required to be sent.

Claims

1. A device for routing a multicast packet between at least one first device using IPv4 as a communication protocol and at least one second device using IPv6 as a communication protocol, the device comprising:

plural interfaces connected via a network to either of the at least one first device or the at least one second device;

a transmission/reception unit which routes the multicast packet received from one of the plural interfaces to others of the plural interfaces;

an IP multicast routing control information management unit which, in a case of receiving an MLD (Multicast Listener Discovery) Report message for becoming “

a member using a first IPv6 multicast address as an IP multicast address”

from the second device via a first IPv6 interface, obtains a first IPv4 multicast address corresponding to the first IPv6 multicast address, and generates and holds multicast routing information associating the first IPv4 multicast address with the first IPv6 interface; and

a conversion unit which, when the transmission/reception unit receives from the first device an IPv4 multicast packet containing the first IPv4 multicast address as a destination address, converts an IPv4 multicast address contained as a destination address in the IPv4 multicast packet into the corresponding first IPv6 multicast address and generates from the IPv4 multicast packet an IPv6 multicast packet containing the first IPv6 multicast address as a destination address,

wherein the transmission/reception unit transmits the IPv6 multicast packet thus generated to the first IPv6 interface stored in association with the first IPv4 multicast address which is the destination address of the IPv4 multicast packet thus received, in accordance with the multicast routing information held in the IP multicast routing control information management unit.

2. A device according to claim 1, wherein the first IPv4 multicast address corresponding to the first IPv6 multicast address is obtained by adding deleting a fixed pattern from the first IPv6 multicast address.

3. A device according to claim 1, further comprising:

a holding unit which holds at least one IPv6 unicast address, wherein the conversion unit converts an IPv4 unicast address contained as an originating address in the IPv4 multicast packet into an IPv6 unicast address of the at least one IPv6 unicast address held in the holding unit and generates an IPv6 multicast packet containing the IPv6 unicast address thus converted as an originating address.

4. A device according to claim 3, wherein the holding unit obtains an unused IPv6 unicast address from a DHCP server and holds the unused IPv6 unicast address.