🚀 go-pugleaf

   Date: Mon, 8 Dec 1997 17:24:01 -0600
   From: David Gadbois <gadbois@cyc.com>

   I picked up some XL1201s recently and have been having some strange
   networking problems with a few of them.  Every thing works great,
   except for band transfer.  Some times it works, sometimes it
   doesn't.  I have tried replacing networking gear, isolating
   machines, both the Chaos and TCP transports.  There doesn't seem to
   be any correspondence with the I/O or processor board revision
   levels.  The fact that only band transfer is affected makes me
   think there is a software or configuration problem.  One
   possibility is the version 333 IFEP files, which I haven't used
   before.  Any ideas?

As usual, the problem was where I least expected.  It turns out that a
!@#$ Ascend router was randomly ARP replying claiming that it was the
lispms.  Why it decided to pick on the new machines, and why it only
did so when a band transfer was happening, is a mystery to me.  In any
case, it has been chastised, and its auto-ARPing behavior has been
turned off.

For a good time, do:

    (mapcar #'(lambda (interface)
		(send interface :describe-protocols))
	    neti:*interfaces*)

It may save you some head-scratching.

--David Gadbois