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Network Working Group                            Ralph AlterRFC #305                                         BBNNIC #9078                                        23 February 1972UNKNOWN HOST NUMBERS--------------------   In response to a recent minor flurry of confusion, it seems worth   announcing publicly the fact that new IMPs are tested (almost   always) on the ARPA Net here at BBN before delivery to the intended   site.  Accordingly, sites should not be surprised to receive RFCs   or at least RSTs from IMPs or Hosts they thought didn't exist, or   at least did not exist yet.   Occasionally, IMPs of some given configuration are tested in a   mode where they announce their IMP number as different from what   it will be when finally installed.  A variety of reasons may create   such a situation.  The latest such occurrence is that a TIP, to be   installed shortly at ETAC with IMP number 20 (replacing the 316   IMP now at ETAC which is number 20) was recently tested here with   McClellan's IMP number (22).  (It couldn't be tested with its own   number since the 316 IMP currently at ETAC is using that number.)   The result was RSTs from the TIP (Host 3) at IMP 22 - which is   network address 150 (226 octal or 96 hex).   One site asked if their Host tables needed updating.  The answer   is _NO_.  We fully expect IMPs tested under these circumstances to be   ignored or CLS'd by some Hosts.  We suggest that Host tables (where   they are thought to be necessary) be modified only in response to   official notification from BBN via either an RFC or an update toAppendix A of BBN Report #1822.   RA/jm       [ This RFC was put into machine readable form for entry ]       [ into the online RFC archives by BBN Corp. under the   ]       [ direction of Alex McKenzie.                   12/96   ]                                                                [Page 1]