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This appendix lists work that future revisions of this document may wish to address.

In the preparation of Router Requirements, we stumbled across several other architectural issues. Each of these is dealt with somewhat in the document, but still ought to be classified as an open issue in the IP architecture.

Most of the topics presented here generally indicate areas where the technology is still relatively new and it is not appropriate to develop specific requirements since the community is still gaining operational experience.

Other topics represent areas of ongoing research and indicate areas that the prudent developer would closely monitor.

  1. SNMP Version 2

  2. Additional SNMP MIBs

  3. More detailed requirements for leaking routes between routing protocols

  4. Router system security

  5. Routing protocol security

  6. Internetwork Protocol layer security. There has been extensive work refining the security of IP since the original work writing this document. This security work should be included in here.

  7. Load Splitting

  8. Sending fragments along different paths

  9. Multiple logical (sub)nets on the same wire. Router Requirements does not require support for this. We made some attempt to identify pieces of the architecture (e.g., forwarding of directed broadcasts and issuing of Redirects) where the wording of the rules has to be done carefully to make the right thing happen, and tried to clearly distinguish logical interfaces from physical interfaces. However, we did not study this issue in detail, and we are not at all confident that all the rules in the document are correct in the presence of multiple logical (sub)nets on the same wire.

  10. Congestion control and resource management. On the advice of the IETF's experts (Mankin and Ramakrishnan) we deprecated (SHOULD NOT) Source Quench and said little else concrete (Section 5.3.6).

  11. Developing a Link-Layer requirements document that would be common for both routers and hosts.

  12. Developing a common PPP LQM algorithm.

  13. Investigate of other information (above and beyond section [3.2]) that passes between the layers, such as physical network MTU, mappings of IP precedence to Link Layer priority values, etc.

  14. Should the Link Layer notify IP if address resolution failed (just like it notifies IP when there is a Link Layer priority value problem)?

  15. Should all routers be required to implement a DNS resolver?

  16. Should a human user be able to use a host name anywhere you can use an IP address when configuring the router? Even in ping and traceroute?

  17. Almquist's draft ruminations on the next hop and ruminations on route leaking need to be reviewed, brought up to date, and published.

  18. Investigation is needed to determine if a redirect message for precedence is needed or not. If not, are the type-of-service redirects acceptable?

  19. RIPv2 and RIP+CIDR and variable length network prefixes.

  20. BGP-4 CIDR is going to be important, and everyone is betting on BGP-4. We can't avoid mentioning it. Probably need to describe the differences between BGP-3 and BGP-4, and explore upgrade issues...

  21. Loose Source Route Mobile IP and some multicasting may require this. Perhaps it should be elevated to a SHOULD (per Fred Baker's Suggestion).

Next: APPENDIX D. Multicast Routing Protocols

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