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- Network Working Group D. Heagerty
- Request for Comments: 1670 CERN
- Category: Informational August 1994
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- Input to IPng Engineering Considerations
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- Status of this Memo
-
- This memo provides information for the Internet community. This memo
- does not specify an Internet standard of any kind. Distribution of
- this memo is unlimited.
-
- Abstract
-
- This document was submitted to the IETF IPng area in response to RFC
- 1550. Publication of this document does not imply acceptance by the
- IPng area of any ideas expressed within. Comments should be
- submitted to the big-internet@munnari.oz.au mailing list.
-
- Summary
-
- This white paper expresses some personal opinions on IPng engineering
- considerations, based on experience with DECnet Phase V transition.
- It suggests breaking down the IPng decisions and transition tasks
- into smaller parts so they can be tackled early by the relevant
- experts.
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- Timescales
-
- In order to allow key decisions to be taken early, I would like to
- see IPng decisions and timescales broken down into into smaller
- parts, for example:
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- - address structure and allocation mechanism
- - name service changes
- - host software and programming interface changes
- - routing protocol changes
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- Although interrelated, not all details need to be defined by the same
- date. Identify which decisions will be hard to change and which can
- be allowed to evolve. All changes should be worked on in parallel,
- but the above list indicates a feeling for urgency of a decision.
- Our experience has been that administrative changes (as may be
- required for addressing changes) need the greatest elapse time for
- implementation, whereas routing protocol changes need the least.
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- Heagerty [Page 1]
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- RFC 1670 Input to IPng Engineering Considerations August 1994
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- I would like to see an early decision on address structure and enough
- information for service managers to start planning their transition.
- Some hosts will never be upgraded and will need to be phased out or
- configured with reduced connectivity. A lead time of 10 years (or
- more) will help to take good long term technical decisions and ease
- financial and organisational constraints.
-
- Transition and deployment
-
- Transition requires intimate knowledge of the environment (financial,
- political as well as technical). The task needs to be broken down so
- that service managers close to their clients can take decisions and
- make them happen.
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- Let the service managers adapt the solutions for their environment by
- providing them with a transition toolbox and scenarios of their uses
- based on real examples. Clearly state the merits and limitations of
- different transition strategies.
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- Provide for transition autonomy. Let systems and sites transition at
- different times, as convenient for them.
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- Identify what software needs to be changed and keep an up-to-date
- list.
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- Identify what is essential to have in place so that service managers
- can transition at their own pace.
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- Allow for a feedback loop to improve software based on experience.
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- Configuration, Administration, Operation
-
- We run IP on a wide range of equipment and operating systems. We
- need an easy way to (re-)configure all our IP capable systems. The
- systems need to be sent their IP parameters (e.g., their address,
- address of their default router, address of their local name servers)
- and we need to obtain data from the system (e.g., contact information
- for owner, location and name of system). We also need an easy way to
- update DNS.
-
- In our environment systems are regularly moved between buildings and
- we therefore find the tight coupling of IP address to physical subnet
- over restrictive. Automatic configuration could help overcome this.
-
- We would like to efficiently load balance users of various IP based
- services (e.g., telnet, ftp, locally written applications) across a
- number of systems.
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- Heagerty [Page 2]
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- RFC 1670 Input to IPng Engineering Considerations August 1994
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- The ability to break down addresses and routing into several levels
- of hierarchy is important to allow the delegation of network
- management into subdomains. As the network grows so does the desire
- to increase the number of levels of hierarchy.
-
- Disclaimer and acknowledgments
-
- This is a personal view and does not necessarily represent that of my
- employer. I have benefited from many transition discussions with my
- colleagues at CERN, other High Energy Physics DECnet managers and
- Digital Equipment Corporation engineers.
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- Security Considerations
-
- Security issues are not discussed in this memo.
-
- Author's Address
-
- Denise Heagerty
- Communications Systems Group
- Computing and Networks Division
- CERN
- European Laboratory for Particle Physics
- 1211 Geneva 23, Switzerland
-
- Phone: +41 22 767-4975
- Fax: +41 22 767-7155
- EMail: denise@dxcoms.cern.ch
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- Heagerty [Page 3]
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