ftpmirror.py problems

[Cary Coulter]

I appreciate your comments (and quick response).

The network is connected via a cable modem.  The workstation in
question (running ftpmirror.py) is directly connected to the firewall
which is connected to the cable modem.  The MTU on all ethernet cards
in the network is 1500.

Let me add that if I connect to the desired ftp server via an ftp
client, I can download as many files as I want (using mget *) without
any problem.  This method surely has the same impact on IP Masq and
the ftp helper module.  Why is it this works but ftpmirror.py doesn't.

Since this is perhaps getting off topic, I am willing to continue this
discussion via email.  Be sure to remove the "_NO" from my address.

Thanks
Cary

On Sun, 25 Mar 2001 18:13:51 -0600, "Chris Gonnerman"
<chris.gonnerman at usa.net> wrote:

>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
>> 
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
>> 
>