Re: FTP questions.


Bill Barns (barns@gateway.mitre.org)
Thu, 11 Aug 88 13:57:37 EDT


As best I recollect (someone correct me if I'm wrong), TOPS-20 transfers
that use page structure and stream mode do not close the data connection
after each file. I don't recall hearing anyone claim that this was
the wrong thing to do, at least within the last few years. By analogy,
I think it is ok to leave the connection up for record structure and
stream mode.

It's unfortunate that 3.3 is not quite consistent with 3.2 (and
implicitly disagrees with 3.4.x also, where a point is made of
saying that the close is necessary in file structure, but nothing is
said about it for the other structures.) I think that 3.2 should be
believed. The closing of the data connection at the end of any transfer
is at the server's discretion, so you wouldn't be out of spec to do it
if you are writing a server, but as you said in the first place,
it seems like a useless thing to do.

I believe that MIL-STD-1780 FTP is consistent with what I have just
said. The relevant reference seems to be section 5.4.2, entitled
"Alternate Data" (huh?) The MIL-STD has its little organizational
glitches too, you see. Sigh. I have not noticed anything in the MIL-STD
that replicates the troublesome wording of 3.3 of the RFC, but given
the way the MIL-STD is put together, I'm not willing to make a promise
even though I've got it open right in front of me.

Bill Barns / MITRE / barns@gateway.mitre.org



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