Asymmetric Routing

Steven J. Richardson sjr at
Mon Oct 23 19:13:40 UTC 1995


  This is misleading at best...

  >From list-admin at Fri Oct 20 15:19:42 1995
  >From: Sean Doran <smd at>
  >To: joliveto at, nanog at
  >Subject: Re: Asymmetric Routing
  >Message-Id: <95Oct20.142237-0400_edt.20696+16 at>
  >Date: 	Fri, 20 Oct 1995 14:22:35 -0400
  >Status: R
  >| Analysis of some of our routes shows the potential for asymmetric 
  >| routing...that is...the transmit path will be different than the return path 
  >| for packets.
  >Asymmetry has been a reality for quite some time now; in fact
  >it was happening during the NSFNET backbone service days,
  >since the information in the PRDB was often in a shambles.
  Not surprisingly, the PRDB was as good as the information 
  which was submitted by customers of the NSFNET BNS, though
  there was a lot of checking done to try to proactively catch
  mistakes.  As someone who was working with/supporting the 
  NSFNET configuration process, I do not know of other customers 
  claiming that "the PRDB was often in a shambles" via phone, email,
  or third-party reports.
  >	Sean.

  Steve Richardson, Merit

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