[svlug] Re: iptables problem with Red Hat 7.2

Craig Oda craigoda at yahoo.com
Sun Jan 13 19:21:01 PST 2002

Thanks Tim and others for all the suggestions.  I've solved the
problem, which appears to have been related to some piece of hardware
on the mainboard or power supply.  I'm using the same ethernet cards,
PCI SCSI controller and same disk image with another mainboard and
power supply and things appear to be working fine.

Some helpful person told me about /etc/sysctl.conf which I didn't know
about at first and thought that might be the problem.  It wasn't the
problem, but it was great to learn about it.  For those that don't
know, there should be this line:
  net.ipv4.ip_forward = 1
in the file.

Thanks again to everyone for the help.  I was impressed with the level
of respones I received.

> From: "Tim Pepper" <tpepper at vato.org>
> Date: Fri, 11 Jan 2002 10:19:11 -0800
> To: svlug at svlug.org
> Subject: Re: [svlug] iptables problem with Red Hat 7.2
> I'm running 2.4.17 on a RedHat 7.1 machine doing forwarding with
> iptables and
> haven't seen any problems like that.
> Are there any cron jobs anywhere that might be doing it?  Are your
> chains being set via /etc/sysconfig/iptables or some other mechanism?
> You might try some recursive grepping for ip_forward and try to see
> what
> file might be twiddling that bit.  Or set the proc entry
> non-writeable
> and see if you maybe get any indication of a cron job failing.
> I can't think of a generic/easy way to catch a particular file being
> opened by a random app.  Maybe somebody here could recommend one.
> Although it's probably echo so maybe you could modify echo to raise a
> flag if it's doing an open on ip_forward.  Assuming it's not
> something
> in the kernel...
> Tim

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