[Talk] A denial of service attack?

Luigi Cantoni LCantoni at asi.com.au
Fri Jun 14 17:11:28 EST 2002

I had a chat around the office and the quick thought and we agree with Greg.
Someone is going for you. No we have not seen it done before but we are sure
you can do it with programmable cards which I think your sparc stations

> -----Original Message-----
> From: Greg 'groggy' Lehey [mailto:Greg.Lehey at auug.org.au]
> Sent: Friday, 14 June 2002 5:00 PM
> To: David Purdue
> Cc: talk at auug.org.au
> Subject: Re: [Talk] A denial of service attack?
> On Friday, 14 June 2002 at 15:46:04 +1000, David Purdue wrote:
> > We are seeing something strange here, and if it is not a DOS
> > attack or virus of some kind, it is a grand idea for one.
> >
> > Here is what we see:
> >
> > - a system is sending out DHCP requests using a bogus Ethernet
> > MAC address.
> >
> > - as soon as it gets a lease on an address, it increments the MAC
> > address and tries again - this ensures it does not get the same
> > MAC address reallocated.
> >
> > The effect is that the DHCP server is running out of addresses
> > to give - so as people turn on their desktops they can not connect
> > to the network, and as leases expire connected desktops are
> > effectively getting thrown off the network!
> >
> > Does anyone know of anything (either because of bug or malicious
> > intent) that behaves in this way?
> I've never heard of this one before, but I'd have difficulty believing
> that it's a bug.  This should also be good for confusing the hell out
> of switches.  Can't you trace where it's coming from?
> Greg
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