Re: Linux hangs when net too used
Conrado Badenas wrote:
>
> Hi all!
>
> I've been having problems with Linux the last months, but now I have
> isolated the problem: Linux hangs.
>
> 1) I thought it was the kernel but it hangs with 2.0.34, 2.0.35 and
> 2.2.1
> 2) Then I thought it was the memory but memtest (package sysutils) says
> it is OK.
> 3) Then I thought I was being attacked with a DNS, but I read about them
> and kernel 2.2.1 should stop teardrop, winnuke, etc.
2 points: 1) DNS = Domain Name Something-or-Other, DoS = Denial of
Service
2) There are loads of possible ways that your system could go down due
to a DoS attack - winnuke, teardrop et al. are just the very publicised
methods. Variations on these and new methods will be discovered/invented
on a regular basis.
> 4) Then somebody told me that maybe only X hanged and I could access my
> machine from outside: I checked that I couldn't telnet/ftp/http my
> machine from outside
> 5) Now, one of my users connected from outside via ftp and began
> uploading a file of more than 3 Mb. He tried it three times, and my
> machine hanged three times (one hang, one boot, one hang, one boot, one
> hang, one boot, I denied access to this user, no hangs)
>
> WHAT IS HAPPENING? I love Linux but my friends laugh at me when I tell
> them that Linux hangs.
>
You do not say what hardware you are using:- this sounds to me like a
hardware problem.
2.0.36 is a widely used kernel. It has been around (or at least the
latter 2.0.x series has) for a long time (> 1 year), so it should be
pretty stable.
It is unlikely that you have discovered a new kernel bug that no other
linux users have noticed.
As it happens when your user was ftping, this could be when there was
extra network usage (although it could also be to do with memory, hard
disk, motherboard ....... Do you use an ethernet card or a modem or
what? What manufacturer/model? You need to give some info. Are you
compiling your own kernel or using the stock debian one?
> --
> Conrado Badenas (Assistant Lecturer)
> Department of Thermodynamics. University of Valencia
> c/. Doctor Moliner, 50 | e-m: Conrado.Badenas@uv.es
> 46100 Burjassot (Valencia) | Phn: +34 - 963 864 350
> SPAIN | Fax: +34 - 963 983 385
>
> --
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