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Date: Wed, 7 May 1997 10:56:57 -0700 (PDT)
From: Tom Samplonius <tom@sdf.com>
To: Shawn Carey <smc@servtech.com>
cc: freebsd-hackers@freebsd.org
Subject: Re: FTP Performance
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On Wed, 7 May 1997, Shawn Carey wrote:

> Hello,
> 
> I have what seems to be a strange problem with FTP performance varying
> drastically between getting files from and putting files to my FreeBSD
> 2.2.1 FTP server.
> 
> The machine is connected to my ISP with iijppp via a 28.8 modem.  When I
> FTP to a remote server, receiving files come in reasonably at 3.5-4.0
> K/sec.  The same is true if someone FTP's to my system and puts a file.
> 
> But when someone connects to my system and tries to get a file or if I
> FTP to a remote server and try to put a file, the performance is dismal
> (bytes/sec) and typically the transfer never even completes.
> 
> In short, trying to get files out of my system, either by putting as a
> client or by being get'ed as a server doesn't work well at all.
> 
> To make matters even stranger (or maybe not), all of these problems
> disappear if I only FTP to/from systems inside my ISP's routers.  I have
> contacted them about this, and they claim that the problem lies with the
> systems I am trying to transfer files to/from.  I could believe this if
> the throughput were roughly the same no matter which direction the bits
> were travelling.
> 
> So I guess what I'm hoping to learn here is:
> 
> a) Is there anything I can adjust to speed up outgoing FTP transfers?
> b) Is there any way I can prove or disprove my ISP's claim.  I could
> probably prod them into action with hard evidence, but I don't know how
> to get it...
> 
> Any suggestions are appreciated.
> 
> Thanks,
> -Shawn Carey
> 
> 

  Try fiddling with the tcp_extensions option in /etc/sysconfig  It could
be that your ISP's border router can't handle them.

Tom