Comparison of Proposals for Next Version of IP (RFC1454)
Original Publication Date: 1993-May-01
Included in the Prior Art Database: 2000-Sep-12
Internet Society Requests For Comment (RFCs)
This is a slightly edited reprint of RARE Technical Report (RTC(93)004).
Network Working Group T. Dixon
Request for Comments: 1454 RARE
Comparison of Proposals for Next Version of IP
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard. Distribution of this memo is
This is a slightly edited reprint of RARE Technical Report
The following is a brief summary of the characteristics of the three
main proposals for replacing the current Internet Protocol. It is not
intended to be exhaustive or definitive (a brief bibliography at the
end points to sources of more information), but to serve as input to
the European discussions on these proposals, to be co-ordinated by
RARE and RIPE. It should be recognised that the proposals are
themselves "moving targets", and in so far as this paper is accurate
at all, it reflects the position at the 25th IETF meeting in
Washington, DC. Comments from Ross Callon and Paul Tsuchiya on the
original draft have been incorporated. Note that for a time the term
"IPv7" was use to mean the eventual next version of IP, but that the
same term was closely associated with a particilar proposal, so the
term "IPng" is now used to identify the eventual next generation of
The paper begins with a "generic" discussion of the mechanisms for
solving problems and achieving particular goals, before discussing
the proposals invidually.
1. WHY IS THE CURRENT IP INADEQUATE?
The problem has been investigated and formulated by the ROAD group,
but briefly reduces to the following:
- Exhaustion of IP Class B Address Space.
- Exhaustion of IP Address Space in General.
- Non-hierarchical nature of address allocation leading to flat
Although the IESG requirements for a new Internet Protocol go further
than simply routing and addressing issues, it is these issues that
make extension of the current protocol an impractical option.
Consequently, most of the discussion and development of the various
proposed protocols has concentrated on these specific problems.
Near term remedies for these problems include the CIDR proposals
(which permit the aggregation of Class C networks for routing
purposes) and assignment policies which will allocate Class C network
numbers in a fashion which CIDR can take advantage of. Routing
protocols supporting CIDR are OSPF and BGP4. None of these are pre-
requisites for the new IP (IPng), but are necessary to prolong the
life of the current Internet long enough to work on longer-term
solutions. Ross Callon points out that there are other options for
prolonging the life of IP and that some ideas have been distributed
on the TUBA list.
Longer term proposals are being sought which ultimately allow for
further growth of th...