Re: Slow FTP transfers

["Bill O'Connell" <boconnell () libertycreativesolutions com>]

I've had a similar problem twice.

The first time we had a bad network cable that was causing repeated resends due to a short. This sometimes caused 
timeouts if a file couldn't be transferred within a certain amount of time

The second time we had a wireless T1 that was being blocked by a tree. Small files came across, but large files would 
sometimes time out. Not always, though, due to the fact that the tree's leaves would blow in the wind or be still.

Both issues were basically the same. Frequent packet errors which cause retransmits and eventually timeouts when the 
sending computer does not get a response. It taught me to never overlook the basics!


Bill O'Connell Network Solution Manager
Liberty Creative Solutions, Inc.
18625 West Creek Dr.  |  Tinley Park, IL 60477
V: (708) 633-7450
F: (708) 633-7449
www.libertycreativesolutions.com

From: firewall-wizards-bounces () listserv cybertrust com [mailto:firewall-wizards-bounces () listserv cybertrust com] 
On Behalf Of Farrukh Haroon
Sent: Tuesday, August 25, 2009 2:50 AM
To: Firewall Wizards Security Mailing List
Subject: Re: [fw-wiz] Slow FTP transfers

Your problem could be due to your firewall blocking the IDENT protocol

Have a look at this link:

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a0080094317.shtml

It could also be related to PTR records for your DIP Pool (but highly unlikely):

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a0080094459.shtml

Regards

Farrukh
On Mon, Aug 24, 2009 at 7:26 PM, Francois Yang <francois.y () gmail com<mailto:francois.y () gmail com>> wrote:
I've seen slow traffic due to the firewall trying to do many things
like checking for viruses, packet anomalies, etc...
Maybe there's some checks that works better or worst depending if the
ftp session is passive or not.

Frank


On Fri, Aug 21, 2009 at 7:43 AM, Behm, Jeff<jbehm () burnsmcd com<mailto:jbehm () burnsmcd com>> wrote:
> On Thursday, August 20, 2009 12:19 PM, sky said:
>
> > I'm having an issue when ftp'ing (default port mode) large file
> > (50megs) to a remote server sitting behind FWSM. The transfer
> > gets real slow and at times just timeouts.
>
> > Any thoughts will be great.
>
> Any sort of packet shaper/QoS device between the endpoints?
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