http://www.rfc-editor.org/rfc/rfc4116.txt
RFC 4116: IPv4 Multihoming Practices and Limitations, J. Abley, K. Lindqvist, E. Davies, B. Black, V. Gill2005-07-01T23:00:00-00:00Multihoming is an essential component of service for many Internet sites. This document describes some implementation strategies for multihoming with IPv4 and enumerates features for comparison with other multihoming proposals (particularly those related to IPv6). This memo provides information for the Internet community.