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Olaf Maennel's Publications

The A+P Approach to the IPv4 Address Shortage
Citation key IIJ-TAPATTIAS-09
Author Bajko, Gabor and Bellovin, Steven M. and Bush, Randy and Cittadini, Luca and Durand, Alain and Maennel, Olaf and Savolainen, Teemu and Zorz, Jan
Year 2009
Month October
Note Current version (Dec. 2009): 05
How Published IETF Internet-Draft draft-ymbk-aplusp-05
Abstract We are facing the exhaustion of the IANA IPv4 free IP address pool. Unfortunately, IPv6 is not yet deployed widely enough to fully replace IPv4, and it is unrealistic to expect that this is going to change before we run out of IPv4 addresses. Letting hosts seamlessly communicate in an IPv4-world without assigning a unique globally routable IPv4 address to each of them is a challenging problem. This draft discusses the possibility of address sharing by treating some of the port number bits as part of an extended IPv4 address (Address plus Port, or A+P). Instead of assigning a single IPv4 address to a customer device, we propose to extended the address by ``stealing'' bits from the port number in the TCP/UDP header, leaving the applications a reduced range of ports. This means assigning the same IPv4 address to multiple clients (e.g., CPE, mobile phones), each with its assigned port-range. In the face of IPv4 address exhaustion, the need for addresses is stronger than the need to be able to address thousands of applications on a single host. If address translation is needed, the end-user should be in control of the translation process–not some smart boxes in the core.
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