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000329_news@columbia.edu_Sat Sep 9 20:32:51 1995.msg
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From: ddl@harvard.edu (Dan Lanciani)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: MS-DOS Kermit 3.14 Second Edition
Message-Id: <2989@sun3.IPSWITCH.COM>
Date: 9 Sep 95 20:32:51 GMT
References: <3tf3n7$2tl@apakabar.cc.columbia.edu> <42qciv$c6k@cpmt.cyberport.net> <1995Sep9.114915.60947@cc.usu.edu>
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In article <1995Sep9.114915.60947@cc.usu.edu>, jrd@cc.usu.edu (Joe Doupnik) writes:
[...]
| Ugh(tm). Arcnet with ODI has its share of problems when it comes
| to ARP.
ODI makes your application completely media-independent... :) As long
as your medium looks like Ethernet/802.3/802.5... :(
|An ARCnet MAC address is one byte long, yet ODI provides six byte
| MAC addresses. Which end of that string will the byte appear? Undocumented.
I seem to recall that the answer here is that there isn't a simple answer.
There is certainly an end where the node id appears (check the ODIPKT sources;
I forget which end it is), but there are other cases where all six bytes are
significant. For example, I think you get into trouble unless you set all
six bytes to ff for a broadcast, at least on some drivers.
| The medium ident appearing in an ARP packet reflects the kind of wiring,
| 6 for Ethernet and presumably 7 for ARCnet. I did make some changes in the
| MAC address extraction procedure in MSK mark II, and maybe something got
| broken.
The poster with the ARCNet problem might want to try running over ODIPKT.
It understands all these details and presents a fake Ethernet driver
interface to the client (kermit in this case). I did all the original
development with [T]RXNET so it should work with that if anything. :)
| I tested earlier MSK's with ARCnet, and honestly I found that
| arrangment to be flakey at best. It's not MSK but rather whatever IP
| routing a NW server does in that case.
Funny, I've found most users of the server's IP routing features to have
no trouble. It does (did?) enforce some subnetting restrictions a little
too enthusiastically, but I guess one can't blame them for following
the RFCs...
|I found that connections would
| cease operating after a while or be reluctant to progress.
I wonder if this is related to the Linux ARP problem described earlier?
Like Linux, the NW server does time out ARP entries. Perhaps something
similar is happeneing?
Dan Lanciani
ddl@harvard.*