Date: Tue, 16 Jun 1998 08:08:18 +0200 From: Christoph Kukulies <kuku@gilberto.physik.RWTH-Aachen.DE> To: Michael Richards <miker@scifair.acadiau.ca> Cc: Christoph Kukulies <kuku@gilberto.physik.RWTH-Aachen.DE>, questions@FreeBSD.ORG Subject: Re: using tcpdump effectively Message-ID: <19980616080818.08890@gil.physik.rwth-aachen.de> In-Reply-To: <Pine.BSF.3.96.980615202443.10124B-100000@scifair.acadiau.ca>; from Michael Richards on Mon, Jun 15, 1998 at 08:29:01PM -0300 References: <199806151447.QAA29137@gilberto.physik.RWTH-Aachen.DE> <Pine.BSF.3.96.980615202443.10124B-100000@scifair.acadiau.ca>
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On Mon, Jun 15, 1998 at 08:29:01PM -0300, Michael Richards wrote: > On Mon, 15 Jun 1998, Christoph Kukulies wrote: > > > What sporadically happens is that a X session to our Mentor Design Architect > > running on HP is ceased and the connection breaks (we login via rlogin > > and start the X client with DISPLAY set to the FreeBSD machine.) > Es mag dich nicht! > > > When the connection breaks we see something like 'no route to host' > This looks like it could be a routing problem. The X protocol has a number > of well known security problems. Personally I would suggest that you use > secure shell to forward the X11 connections. I believe you can download > the unix verion from www.datafellows.com. I should mention that this route lost problem occurs even in the LAN on the same ethernet (!). Looks to me like the infamous sniper bug that NT 3.1 once introduced. (Snipers are 'Heckenschuetzen', in the Bosnia War or Partisans during WWII, who fire from behind a wall or from some hidden place). NT was sending some sort of ICMP packets which caused something like host unreachable situations. (roughly speaking). > > > Could that be caused by denial of service attacks? What exactly is a denial > > of service attack? > Rather than try to break into a system, the person simply tries to break > the system so as to be a pain in the butt to the "real" users. > > -Mike -- Chris Christoph P. U. Kukulies kuku@gil.physik.rwth-aachen.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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