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Old 07-25-2004, 07:45 AM   #1
furryspider
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Registered: Feb 2004
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Question Uploads stall after some kB (modem). Firewall-Problem?


Hi,

I've been doing some searches on my problem, but in vain. Hopefully you can help, because I'm out of leads.

Sorry in advance for the load of text, but since I'm not sure where the problem comes from, I wanted to make certain you could spot obvious issues.

Background:
===========
I'm running Slackware Linux 10 (2.4.26) with a set of iptables rules in /etc/rc.d generated by Guarddog. I'm not a netfilter pro, and feel reluctant to become one.
My internet connection is dialup via a 56k-Modem.
I can surf the web, download files, chat on ICQ and IRC, and send 'regular' eMails without problems.

Problem:
===========
I tried to send an archive of about 300 kB by eMail. It started out alright, but continuously got slower and slower, until it stalled after about 30 kB and cancelled the transfer. I tried again - same result.

I then tried to upload the data to some FTP space. Again, the transfer began and then slowly came to stagnation.
Using a different dialup-ISP or different FTP space was no good.

Then I rebooted without the firewalling rc-script and tried again: Both sending the eMail and uploading to FTP worked.


Questions:
============
In what way could my ruleset inhibit the sending of data that exceeds a certain size?
Is it possible at all that the problem is size-dependent?
If so, what do I do against it?



Thanks in advance!
- FurrySpider -
 
Old 07-27-2004, 03:58 PM   #2
furryspider
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Registered: Feb 2004
Location: by the Bavarian Sea
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A BUMP with some additional information:

I did an upgrade from Slackware 9.1 to 10, not a new installation. Could I have messed something up there, thad could lead to such a result?

I just tried some different kernels: 2.6.7 from Slack10 and 2.4.22 from Slack9.1
No change.

Then I removed iptables 1.2.10 and instead installed 1.2.8 - no change.

Earlier I disabled the iptables-ruleset created by GuardDog and tried rulesets made by other firewalling utilities (firestarter, kmyfirewall). No change.

Has anybody experienced a similar problem?
What could be the cause of the stagnant upload?

I'd really appreciate some help. Thanks.
 
Old 07-30-2004, 12:25 PM   #3
furryspider
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Registered: Feb 2004
Location: by the Bavarian Sea
Distribution: Devuan 3 Beowulf
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Okay, I put _quite_ some effort into fiddling around with my installation.
Thus, I'm going to post the results here, even though there doesn't seem to be much interest. Anyhoo...

It's the kdenetwork 3.2.3 package. I downgraded it to 3.1.4 (from Slack 9.1) again, and it works perfectly.

Of course, it's probably not the whole package, but rather one of the applications in it. But I just don't have the time (or obsession) to find out which. If any of you should stumble upon the answer, please post.
 
  


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