Date: Mon, 15 Jun 1998 20:29:47 -0700 (PDT) From: Doug White <dwhite@gdi.uoregon.edu> To: Christoph Kukulies <kuku@gilberto.physik.RWTH-Aachen.DE> Cc: freebsd-questions@freefall.cdrom.com Subject: Re: using tcpdump effectively Message-ID: <Pine.BSF.3.96.980615202757.2150D-100000@gdi.uoregon.edu> In-Reply-To: <199806151447.QAA29137@gilberto.physik.RWTH-Aachen.DE>
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On Mon, 15 Jun 1998, Christoph Kukulies wrote: > > To trace down why some network based X11 sessions are spuriously failing > I' trying to use tcpdump. > > 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.) > > When the connection breaks we see something like 'no route to host' Most likely the client is loosing the network connection to the host, either by damage to the routing tables on the client or on an intermediate network device. Run a traceroute to the HP box when MDA crashes and see if it fails anywhere. > Could that be caused by denial of service attacks? What exactly is a denial > of service attack? A denial of service attack (DoS) attempts to keep a machine from being servicable by overwhelming it with requests or by disabling a server, rending it useless. Doug White | University of Oregon Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant http://gladstone.uoregon.edu/~dwhite | Computer Science Major NOTICE: Make sure your mailer replies to dwhite@resnet or I won't get it! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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