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- Network Working Group IANA
- Request for Comments: 1797 ISI
- Category: Experimental April 1995
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- Class A Subnet Experiment
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- Status of this Memo
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- This document defines an Experimental Protocol for the Internet
- community. This does not specify an Internet standard of any kind.
- Discussion and suggestions for improvement are requested.
- Distribution of this memo is unlimited.
-
- Discussion
-
- There appears to be some interest in experimenting with subnetting
- the class A addresses.
-
- There is some evidence that not all the routing software in use will
- deal correctly with subnetted class A addresses. It also appears
- that actual use of subnetted class A addresses may be necessary in
- the not too distant future. It is suggested that conducting an
- experiment now to identify and fix any software that does not
- properly handle subnetted class A addresses would be useful and
- important.
-
- To further this experiment the IANA will temporarily designate the
- class A network number 39 to be used in the following way:
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- The high order octet of the 4-octet IPv4 address is the class A
- network number 39. There are two cases for low order 24 bits.
-
- Case 1:
-
- In the first case, the high order bit of these 24 bits is zero and
- the next 15 bits are the low order 15 bits of a previously
- assigned Autonomous System number (AS), as registered by a network
- registry and listed in the RWhois database system.
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- Using the AS number in this way allows the experiment to get
- underway quickly in that it automatically allocates some addresses
- to each service provider and does not require a registration step.
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- One concern is that this might cause a run on AS numbers, since by
- getting an AS number you automatically get some address space.
- This concern should be offset by the fact that the amount of
- address space one gets under this plan is the same as one class C
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- IANA [Page 1]
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- RFC 1797 Class A Subnet Experiment April 1995
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- network number (and it should be easier to get a single class C
- allocated than to get an AS number allocated), and that this is a
- limited time experiment so that these addresses will be temporary.
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- The low order octet of the 4-octet IPv4 address is for local use.
- It is expected that an address of this form will be used to
- identify a specific publicly accessible Internet host.
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- +--------+-+-------+--------+--------+
- | 39 |0| low 15 bits AS | local |
- +--------+-+-------+--------+--------+
- Case 2:
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- In the second case, the high order bit of these 24 bits is one,
- and the remaining 23 bits are assigned by the IANA (currently
- reserved for future use).
-
- +--------+-+-------+--------+--------+
- | 39 |1| variable prefix + local |
- +--------+-+-------+--------+--------+
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- The general intent is to find a way to assign to experimenters
- prefixes of differing lengths so that a variety of experiments can
- be conducted with the prefix/local-address boundary at different
- points.
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- It is not intended that either of these address allocation schemes is
- the model for how subnetted class A addresses will be actually
- allocated in the future.
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- It is expected, to make the experiment interesting, that some
- providers will use these addresses for servers supplying popular
- material via the Web or FTP.
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- For example, if the service provider registered to use AS 690 wished
- to use this style of address to provide access to a server of popular
- information on local host 7, the address would be:
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- +--------+--------+--------+--------+
- | 39 | 2 | 178 | 7 |
- +--------+--------+--------+--------+
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- IANA [Page 2]
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- RFC 1797 Class A Subnet Experiment April 1995
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- The support for DNS name and address resolution should be provided.
- For example, if Alternet wanted to put up a database of interesting
- information using the hostname "Interesting.Alter.Net" using the
- address 39.2.189.7, they would need to put the name to address
- mapping in their name server using the A record
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- Interesting.Alter.Net. IN A 39.2.189.7
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- Similarly, the address to name PTR record should be supported
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- 7.189.2.39.IN-ADDR.ARPA. PTR Interesting.Alter.Net.
-
- which means that the 189.2.39 branch of the IN-ADDR tree would be
- delegated to Alternet for the purposes of this experiment.
-
- To support this, the 39.IN-ADDR.ARPA branch is delegated to the IANA
- to be managed at ISI. The nameserver for this branch is
- IN-ADDR.EP.NET (39.17.199.10). Participants in this experiment
- should contact the administrator of this nameserver to have their
- portion of the address space further delegated. The administrator
- for this server can be reached at <aexpreg@isi.edu>.
-
- Another aspect of the testing that should be performed is to have
- providers interchange addresses to test the portability of subnetted
- class A addresses. It is not intended that this would be the model
- for actual use.
-
- For example, if AS 690 and AS 1800 want to try out routing holes
- in each others' allocations within their AS, that should be
- encouraged. That is, suppose AS 690 handed some address of their
- addresses to AS 1800, and vice-versa. This type of testing will
- be necessary to see if the addresses can be made portable in
- larger sub-A allocations.
-
- This is experiment will be of limited duration and these addresses
- may be reassigned to other uses when the experiment is over.
-
- This experiment will begin on 1-May-95.
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- The current date for the termination of this experiment is 1-Dec-95.
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- IANA [Page 3]
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- RFC 1797 Class A Subnet Experiment April 1995
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- Security Considerations
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- Security issues are not discussed in this memo.
-
- Author's Address
-
- Internet Assigned Numbers Authority (IANA)
- Information Sciences Institute
- University of Southern California
- 4676 Admiralty Way, Suite 1001
- Marina del Rey, CA 90292-6695
-
- Phone: 1-310-822-1511
- EMail: iana@isi.edu
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- IANA [Page 4]
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