Re: Problem connecting to Linux from DECnet/OSI Digital UNIX 4.0E system

[Paul Koning <pkoning@xedia.com>]

>>>>> "Rob" == Rob Davies <robdavies@worldnet.att.net> writes:

 Rob> Hi all, Following on from my earlier post, here's another two
 Rob> traces.

That one looks better, no repeated connect confirms because they are
getting acked this time...

 Rob> A couple of things I noticed:

 Rob> - When using interface lo, it appears that the DECnet
 Rob> short-format frames are being used, whereas the long-format is
 Rob> used on Ethernet ?  I haven't done the hex decode to confirm
 Rob> this, but the headers definitely appear shorter.

lo isn't an Ethernet type interface.  I looked at it for a bit as a
way to test DECnet within a box and found it not really useable
(that's why I use ethertap now).

 Rob> - The segment size requested/declared by Digital Unix is 1454,
 Rob> whereas the segment size used by Linux is 1459 ... could this be
 Rob> the problem?  Isn't the negotiation meant to end up using the
 Rob> smaller of the two?  Given the error message reported, I get the
 Rob> impression that there is definitely some kind of mismatch in the
 Rob> negotiated characteristics.

No, the segment size sent by each end is the largest it will accept.
It applies in that direction.  It's perfectly legal for the two to be
different, and depending on the implementation it may be possible for
a node to send bigger segments than it can receive.

	paul

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