[1018] in resnet
Re: Quick question
daemon@ATHENA.MIT.EDU (Mike Hamrick)
Mon Mar 25 17:51:55 2002
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Date: Mon, 25 Mar 2002 17:28:51 -0500
Reply-To: Resnet Forum <RESNET-L@listserv.nd.edu>
From: Mike Hamrick <mike.hamrick@UNH.EDU>
To: RESNET-L@listserv.nd.edu
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Thank you Michael,
You're the second person to point this out.
Sorry the question wasn't clearer, but this is the language that our
Telecommunication / Network Admin group chose to use as an explanation to
ResNet when a service simply ceased to function without notice, and we
questioned them about it.
They simply stated: "if the FTP client uses random ports" it does not meet
the FPT protocol standards and therefore will be blocked as part of the
default global settings.
I understand what you're saying with regard to it being necessary after
negotiation to make use of other ports, and it stands to reason this would
happen.
I posted the question using their language, so it wouldn't appears as though
I was putting words in their mouth.
Thanks again,
-mike
-----Original Message-----
From: Michael Seibert [mailto:mseibert@HUSKY.BLOOMU.EDU]
Sent: Monday, March 25, 2002 4:38 PM
To: RESNET-L@listserv.nd.edu
Subject: Re: Quick question
>>> mike.hamrick@UNH.EDU 03/25/02 03:54PM >>>
Hello all,
Recent events have prompted me to take very quick, very unscientific survey.
Please just answer YES or NO to the following questions. If you would like
to expound on this matter, please feel free to do so....
* Does your network admin group block FTP clients that do not comply
with the FTP protocol standards? (Specifically any clients that use random
ports, such as QVT FTP)
I think you are talking about active and passive mode ftp. Both are
necessary. For example: if you are downloading a printer driver from HP
this would need to be a passive connection or else HP's web server could
only allow one person to download at a time. The server and client first
negotiate on port 21 and then use a higher port to continue the transfer.
Sendmail works the same way.
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<DIV><SPAN class=824250122-25032002>Thank you Michael,</SPAN></DIV>
<DIV><SPAN class=824250122-25032002></SPAN> </DIV>
<DIV><SPAN class=824250122-25032002>You're the second person to point this
out.</SPAN></DIV>
<DIV><SPAN class=824250122-25032002></SPAN> </DIV>
<DIV><SPAN class=824250122-25032002>Sorry the question wasn't clearer, but this
is the language that our Telecommunication / Network Admin group chose
to use as an explanation to ResNet when a service simply ceased to
function without notice, and we questioned them about it.</SPAN></DIV>
<DIV><SPAN class=824250122-25032002></SPAN> </DIV>
<DIV><SPAN class=824250122-25032002>They simply stated: "if the FTP client uses
random ports" it does not meet the FPT protocol standards and therefore will be
blocked as part of the default global settings.</SPAN></DIV>
<DIV><SPAN class=824250122-25032002></SPAN> </DIV>
<DIV><SPAN class=824250122-25032002>I understand what you're saying with regard
to it being necessary after negotiation to make use of other ports, and it
stands to reason this would happen.</SPAN></DIV>
<DIV><SPAN class=824250122-25032002></SPAN> </DIV>
<DIV><SPAN class=824250122-25032002>I posted the question using their
language, so it wouldn't appears as though I was putting words in their
mouth.</SPAN></DIV>
<DIV><SPAN class=824250122-25032002></SPAN> </DIV>
<DIV><SPAN class=824250122-25032002>Thanks again,</SPAN></DIV>
<DIV><SPAN class=824250122-25032002></SPAN> </DIV>
<DIV><SPAN class=824250122-25032002>-mike</SPAN></DIV>
<DIV><SPAN class=824250122-25032002></SPAN> </DIV>
<DIV><SPAN class=824250122-25032002></SPAN> </DIV>
<DIV><SPAN class=824250122-25032002></SPAN> </DIV>
<DIV><SPAN class=824250122-25032002> </SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT
face=Tahoma>-----Original Message-----<BR><B>From:</B> Michael Seibert
[mailto:mseibert@HUSKY.BLOOMU.EDU]<BR><B>Sent:</B> Monday, March 25, 2002 4:38
PM<BR><B>To:</B> RESNET-L@listserv.nd.edu<BR><B>Subject:</B> Re: Quick
question<BR><BR></FONT></DIV>
<DIV><BR><BR>>>> mike.hamrick@UNH.EDU 03/25/02 03:54PM
>>><BR>Hello all,<BR><BR>Recent events have prompted me to take very
quick, very unscientific survey.<BR><BR>Please just answer YES or NO to the
following questions. If you would like<BR>to expound on this matter,
please feel free to do so....<BR><BR>*
Does your network admin group block FTP clients that do not comply<BR>with the
FTP protocol standards? (Specifically any clients that use
random<BR>ports, such as QVT FTP)<BR></DIV>
<DIV>I think you are talking about active and passive mode ftp. Both are
necessary. For example: if you are downloading a printer driver
from HP this would need to be a passive connection or else HP's web
server could only allow one person to download at a time. The
server and client first negotiate on port 21 and then use a higher port to
continue the transfer. Sendmail works the same way.</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV></BLOCKQUOTE></BODY></HTML>
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