Ivip4 ETR Address Forwarding

Document Type Expired Internet-Draft (individual)
Last updated 2010-07-08
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


ETR Address Forwarding (EAF) is a novel method by which an IPv4 Core- Edge Separation solution to the Internet's routing scaling problem can tunnel packets from an ITR to an ETR. EAF involves using 31 bits of the IPv4 header for new purposes: bit 48, the More Fragments flag, the Fragment Offset field and the Header Checksum field - to carry a 30 bit ETR address. Consequently, packets in this format need to be handled by routers with upgraded functionality. EAF is an alternative to encapsulation and has advantages including: simpler ITRs and ETRs, direct support for conventional RFC 1191 PMTUD, no encapsulation overhead and full compatibility with IPsec AH and Traceroute. This I-D also briefly explores an alternative to this approach: a new header, of the same length and different, with a different 4 bit Version, to carry 31 bits of ETR address.


Robin Whittle (rw@firstpr.com.au)

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