🚀 go-pugleaf

   Many users on our network complaint about their telnet session closed by
the remote host without any warning.  After many days of sniffing the network
with the sniffer, we found that they are some ICMP message that might by the
cause of these problem.  

  Said system A has a telnet session window open to system B.  System A and B
could be running Ultrix v3.0 or IBM RT running BSD 4.3 or SunOS 3.5. There
are few MacOS systems with a Dove SCSI Ethernet device that run MacTCP v1.1.
The Mac System C some time send out an ICMP message with 
"Destination unreachable, Host unreachable" to system A.  The ICMP message from
C tell A that host B is unreachable. When this happen, system just close the
telnet connection to system B without any warning.  The question is why system
C send out this kind of ICMP message to A?  It is not his business at all.
Other mac on the network with other Ethernet card and MacTCP does not do that
Only Mac with Dove SCSI Ethernet card do.   Is any one seen this kind of ICMP
message before?

Thanks,


-- 
Hock-Koon Lim, Information Network services
Case Western Reserve University; Cleveland, Ohio, USA  44106   
(216) 368-2982        lim@ins.cwru.edu