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A Larger Loopback Prefix for IPv6

Document type: Expired Internet-Draft (individual)
Document stream: No stream defined
Last updated: 2013-08-24 (latest revision 2013-02-20)
Intended RFC status: Unknown
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IESG State: Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found here:


During the development and testing of a network application, it can be useful to run multiple instances of the application using the same transport layer protocol port on the same development host, while also having network access to the application instances limited to the local host. Under IPv4, this has commonly been possible by using different loopback addresses within 127/8. It is not possible under IPv6, as the loopback prefix of ::1/128 only provides a single loopback address. This memo proposes a new larger loopback prefix that will provide many IPv6 loopback addresses. The processing rules for this new larger loopback prefix also allow sending or forwarding of packets containing these addresses beyond the originating router under certain circumstances.


Mark Smith <>

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid)