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To: "James Knott" <james.knott,AT,rogers,DOT,com>
Subject: Re: Slow file sharing performance
From: "Hans Steegers" <hsx,AT,dds,DOT,nl>
Date: Sun, 31 Aug 2003 15:04:50 +0200
Cc: <cipe-l,AT,inka,DOT,de>
Reply-to: "Hans Steegers" <steegers,AT,steegers,DOT,nl>

1. Suspect your firewall(s) dropping ICMP or other (SMB/NFS) protocol
related packets. Try it without the firewalls, to be sure.
2. Set on both sides cttl in your options file: cttl 64
Encryption doesn't require a fast CPU: a 486 is sufficient for a
3. Or (maybe) you have got a MTU problem: search the CIPE archives for more

I hope this helps..

Hans Steegers
-----Original Message-----
From: James Knott <james.knott,AT,rogers,DOT,com>
To: CIPE <cipe-l,AT,inka,DOT,de>
Date: Sunday, August 31, 2003 1:53 PM
Subject: Re: Slow file sharing performance

>Jon Bendtsen wrote:
>> James Knott wrote:
>>> I've notice that while my CIPE VPN works, that SMB and NFS access of
>>> my home network from my notebook is slow.  However, going the other
>>> way, accessing file shares on my notebook, from my home lan is fine.
>>> I'm connecting from my notebook, via dialup ISP and cable modem to my
>>> home network.
>>> Why is this problem in only one direction?  Is it due to the speed
>>> difference between my home network and dial up modem?
>> Well, i can think of 2 reasons. The most likely is that you have a
>> different upload and download speed, like 2048kbits down, and 512 up.
>> The other reason could be that one end is much much faster than at home.
>> Suppose you have a recent notebook, then you have at least 500mhz+, if
>> not 1ghz+. At home you might have your old pentium 90mhz as a cipe gw.
>> Thus, when you send stuff from home, the p90 has to encrypt it, and
>> when you send from your notebook that one has to encrypt it. (I'm
>> guessing here that encryption takes longer time than decryption.
>One computer is a 1.113 GHz PIII, the other is an Athlon XP 1700.  I'd
>suspect both ends have sufficient horsepower.  Also, when watching the
>data lights flash, it's apparent that the data transfer stops entirely
>for quite a while.  I would expect transfers to be slower due to the
>dial up connection, but not stopped.  The vastly slower dialup
>connection would rule out the asymetrical cable modem speeds as a cause
>of the problem.  As I mentioned, it only happens in the one direction.
>The firewall is a 166 MHz Pentium and is running about 99% idle.  Also,
>ftp transfers work fine, along with other protocols, such as telnet, ssh
>and X.  The problem appears to occur only with SMB and NFS and only in
>that one direction.
>tnx jk
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