PE-ARP – Port Enhanced ARP for IPv4 Address Sharing
Speakers: Manish Karir, Merit Network
The Internet is rapidly nearing IPv4 address space exhaustion. Current projections predict that within the next two years, all IPv4 address blocks will have been assigned. Various methods such as IPv6 and IPv4 NAT have been proposed to address this scarcity. IPv6 introduces a new set of networking protocols that expands the available number of Internet addresses, while NAT relies on modification of packet headers by the network to implement IPv4 address sharing. In this paper we present a technique that allows multiple end hosts on a network to share a single IP address by relying on the use of a modified hardware address resolution protocol. Using the proposed approach it is possible to allow thousands of end hosts to share a single IPv4 address and at the same time be able to maintain an end-to-end consistent network.
Our approach is fundamentally different from current techniques, as it does not require that packets from the end-host be modified at the network layer by an intermediate entity as they transit the network. In addition, each end-host can use a valid routable public IP address. We focus on an expanded use of existing networking protocols such as ARP and DNS to build a novel IPv4 address sharing technique. We have developed an initial implementation of our ideas via a modified Linux kernel which demonstrates the feasibility of our approach.
See more at: https://www.nanog.org/meetings/nanog47/agenda
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