[HECnet] Thousands of DECnet errors on Tops-20

[Thomas DeBellis]

I was wondering if anybody else had either seen the below or noticed 
it.  I didn't have as free space on my public structure as I thought I 
should, so I went poking around and found:

    TOMMYT:<SYSTEM-ERROR>   Pages   Bytes(Size)  Write Date and Time Writer

      ERROR.SYS.1;P777752      138,495 70909216(36) 11-Jan-2021 14:20:29
    OPERATOR

To put this into perspective, we are looking at about a 304 MB file; 
it's larger than what could have been held on an RP06  So I ran SPEAR 
and pulled down a few of the most recent items, viz:

    ***********************************************
    DECNET ENTRY
      LOGGED ON  9-Jan-2021 19:02:18-EST      MONITOR UPTIME WAS 113
    day(s) 0:50:12
             DETECTED ON SYSTEM # 3691.
             RECORD SEQUENCE NUMBER: 28063.
    ***********************************************
    DECNET Event type 5.15, Receive failed
     From node 2.522 (VENTI2), occurred 9-JAN-2021 19:02:08

       Line NI-0-0

       Failure reason = Frame too long
       Ethernet header = AB 00 00 03 00 00 / AA 00 04 00 FF 0B

There are hundreds of thousands of these, causing ERROR.SYS to grow by a 
number of pages every day.  I didn't remember how to turn a DECnet node 
number into dotted decimal, but I did notice the follow from the DECnet 
bridge (SIGUSR1):

    Host table:
    0: purgatorio 0.0.0.0:0 (Rx: 2963632 (3352330) Tx: 1687334 Fw:
    1276298 (Drop rx: 2076032)) Active: 1 Throttle: 598 (203)
    1: legato 108.65.195.50:4711 [Ov: 0, Nov: 1693548, Lst: 0] (Rx:
    1687334 (1693548) Tx: 1276298 Fw: 1687334 (Drop rx: 6214)) Active: 1
    Throttle: 9054(070)
    Hash of known destinations:
    aa000400080a -> 0 (2.520)
    aa0004000a0a -> 0 (2.522)
    aa000400ff0b -> 1 (2.1023)

So one of these is coming over that bridge (2.1023).  What is AB 00 00 
03 00 00?  Anybody have any ideas of what's going on?  I haven't looked 
in the monitor code, yet.  If you are running any 36 bit OS, what are 
you seeing?

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