ftpmirror.py problems

[Chris Gonnerman]

You are right, in that it is the OS and not Python which is causing
the problem.  You are probably having a known problem involving NAT 
(Network Address Translation, i.e. IPMasq) on the local host and a 
badly configured firewall on the remote end.

If you can do so, configure the Linux system to use MTU/MRU 1500 when
connecting via PPP.  If this does not work, try 296.

The explanation is long and painful, and involves Path MTU Discovery.

----- Original Message ----- 
From: "Cary Coulter" <cwc_NO at sound_NO.net>
Newsgroups: comp.lang.python
To: <python-list at python.org>
Sent: Sunday, March 25, 2001 5:46 PM
Subject: ftpmirror.py problems


> I am trying to use ftpmirror.py to duplicate various subdirectories.
> When I test the replication between two hosts on my local network,
> everything works like expected.
> 
> However, I am having problems replicating hosts residing on the
> internet to my local system.  My local system is on a private network
> (192.168...) behind a Linux firewall using IP Masq.  In this
> environment, I am experiencing "hangs" in the ftpmirror.py
> application.  I have to kill it with ^C.
> 
> I can normally download 10-40 files before this happens.  It seems to
> be more prone if the files are smaller (can download in 3-5 seconds on
> a cable modem) rather than the 10+ MB files.
> 
> Is anyone else experiencing this behavior?  Since it seem to work well
> beween two local hosts, I am suspicious of the firewall and IP Masq.
> I would be grateful for any pointers anyone can give to help remedy
> this situation.
> 
> I am relatively new to Python. I really like what I see but I'm not
> ready to debug this application.  I assume it really works and that
> the problem is something else.
> 
> Thanks in advance for your input
> Cary
> 
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