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A Standard for the Transmission of IP Datagrams on Avian Carriers


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Network Working Group                                        D. Waitzman

Request for Comments: 1149                                      BBN STC

                                                            1 April 1990

 

 

  A Standard for the Transmission of IP Datagrams on Avian Carriers

 

Status of this Memo

 

  This memo describes an experimental method for the encapsulation of

  IP datagrams in avian carriers.  This specification is primarily

  useful in Metropolitan Area Networks.  This is an experimental, not

  recommended standard.  Distribution of this memo is unlimited.

 

Overview and Rational

 

  Avian carriers can provide high delay, low throughput, and low

  altitude service.  The connection topology is limited to a single

  point-to-point path for each carrier, used with standard carriers,

  but many carriers can be used without significant interference with

  each other, outside of early spring.  This is because of the 3D ether

  space available to the carriers, in contrast to the 1D ether used by

  IEEE802.3.  The carriers have an intrinsic collision avoidance

  system, which increases availability.  Unlike some network

  technologies, such as packet radio, communication is not limited to

  line-of-sight distance.  Connection oriented service is available in

  some cities, usually based upon a central hub topology.

 

Frame Format

 

  The IP datagram is printed, on a small scroll of paper, in

  hexadecimal, with each octet separated by whitestuff and blackstuff.

  The scroll of paper is wrapped around one leg of the avian carrier.

  A band of duct tape is used to secure the datagram's edges.  The

  bandwidth is limited to the leg length.  The MTU is variable, and

  paradoxically, generally increases with increased carrier age.  A

  typical MTU is 256 milligrams.  Some datagram padding may be needed.

 

  Upon receipt, the duct tape is removed and the paper copy of the

  datagram is optically scanned into a electronically transmittable

  form.

 

Discussion

 

  Multiple types of service can be provided with a prioritized pecking

  order.  An additional property is built-in worm detection and

  eradication.  Because IP only guarantees best effort delivery, loss

  of a carrier can be tolerated.  With time, the carriers are self-

 

 

 

Waitzman                                                        [Page 1]

 

RFC 1149            IP Datagrams on Avian Carriers        1 April 1990

 

 

  regenerating.  While broadcasting is not specified, storms can cause

  data loss.  There is persistent delivery retry, until the carrier

  drops.  Audit trails are automatically generated, and can often be

  found on logs and cable trays.

 

Security Considerations

 

  Security is not generally a problem in normal operation, but special

  measures must be taken (such as data encryption) when avian carriers

  are used in a tactical environment.

 

Author's Address

 

  David Waitzman

  BBN Systems and Technologies Corporation

  BBN Labs Division

  10 Moulton Street

  Cambridge, MA 02238

 

  Phone: (617) 873-4323

 

  EMail: dwaitzman@BBN.COM

 

 

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