Re: New DoS attack?

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From
Vladimir Uralsky <uwl@koala.lanck.ru>
Date
21 Apr 1998 13:37:52
Subject
Re: New DoS attack?
Message-ID
19980421201320.15084@koala.lanck.ru


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On Tue, Apr 21, 1998 at 09:33:37AM +0400, Alexander B. Povolotsky wrote:
> During last months, I've experienced several STRANGE hangs. TCP stack worked
> OK, while nothing else did. I thought of poor hardware, instable snap,
> everything else.

We have same problems, system hangs every day. Searching a reasons we
find: in all cases of crash we had one ftp user logged in. A user upload
something to incoming directory. We change version of ftpd from default
to latest wu-ftpd. Situation repeated again. We continuously run a
systat -vm and when system hangs can see no hdd transfers, but
periodical pci activity (we have only one pci device -- AHA2940). It's
mostly like a SCSI bus hanging I think. In the nearest future we'll try
to change a AHA to BusLogic. We and some other people have same problem
all of these PCs equipped AHA2940/AIC78[78]0 or AIC7770 host adapters.
But these kind of devices so popular :-).

I see packets to port 0 many times, but it is not hang our system.

--
Vova.

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