Wierd IDE/IP Masq issues

Andrew Bartlett abartlet at samba.org
Sun Nov 3 08:19:36 EST 2002

Paul Bryan wrote:
> Hash: SHA1
> On Sat, 2 Nov 2002 22:47, Geoff Smith wrote:
> > Hi all,
> >
> > I'm getting some really wierd behaviour on my network at home.
> > My desktop machine acts as a gateway for the rest of the machines on the
> > network, just doing basic IP Masquerading using iptables. Whenever I'm
> > either watching a DVD or burning cds on my desktop, my desktop seems to
> > stop forwarding port 80 to other machines on the network. Services like
> > pop email work fine. The moment the cd finishes burning or I turn off
> > the DVD, everything is back to normal.
> > I'm running Red Hat 8 on my desktop. My burner and DVD are both ide
> > drives. DVD is /dev/hdc, burner is /dev/hde.
> > Has anyone seen or heard of this sort of thing before?
> >
> > Cheers,
> >
> > Geoff
> Sounds a little mysterious. What are you using to play DVD's / burning CD's
> with? Have you had a look at netstat when your having the problems, and when
> your not? That might tell you whether something is listening to port 80
> stuff.
> Try to enable logging on iptables and you may see where the packets are
> disappearing to.
> At the very least, you should be able to eliminate some possiblities.
> Also, Have you thought that it may be a coincidence with the CD/DVD issue
> (ie. you've only noticed the problem while doing these things, but it happens
> at other time as well)?

Look into the unmask IRQ setting in hdparm.  I had similar issues - but
it should also affect local services...

Andrew Bartlett

Andrew Bartlett                                 abartlet at pcug.org.au
Manager, Authentication Subsystems, Samba Team  abartlet at samba.org
Student Network Administrator, Hawker College   abartlet at hawkerc.net
http://samba.org     http://build.samba.org     http://hawkerc.net

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