Methods and apparatus for enabling unified (internet protocol version) IPV6/IPV4 routing services over IPv4-only interfaces

摘要

Some embodiments of the present invention provide an apparatus that provides routing services between a red network and a black network. The apparatus includes a red router within the red network, a black router within the black network, and an IP encryptor having a red side IPv4-only interface and a black side interface, with the red side interface operatively coupled to the red router and the black side interface operatively coupled to the black network. The apparatus is configured to provide unified IPv6/IPv4 OSPFv3 routing over IPv4-only interfaces using cross-layer extensions.