lkml.org 
[lkml]   [2001]   [Oct]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Other computers HIGHLY degrading network performance (DoS?)
On Fri, Oct 26, 2001 at 04:01:29PM +0200, Martin Josefsson wrote:
> On Fri, 26 Oct 2001, Anuradha Ratnaweera wrote:
>
> > > One machine begins an intensive downloading job. How can this degrade the
> > > network performance even for ICMP packets between another machine and the
> > > router? Notice that this can't be collitions because the download goes at
> > > 64kbps and the local network is 100 Mbps. Something funny is going on to
> > > stop other people's packets.
> >
> > Just found out that this is _not_ a problem of the "download accelerator", but
> > something to do with queuing algorithm of the router. Even a normal wget
> > process or a big mail has a big impart on the network. Hopefully an iptables
> > firewall would solve the problem.
>
> I'd advice you to seriously look over your network, are you 100% sure you
> don't have a duplex-issue anywhere?

I will double check. I wonder if this is the cause, because the network is 100
Mbps, but the router is switching only at 64kbps.

> I've been running linuxrouters for quite a while and right now I have a few
> linuxrouters routing 100Mbit/s internetconnections. We have never had any
> problems like the one you describe so my first guess would be that you have a
> duplexproblem, probably between the linuxrouter and the switch it's connected
> to on the inside, that's usually where it's located.

We have a hub, and not a switch. Can this be the reason? BTW, how come that a
duplex issue can result in such huge degradations?

> I seriously doubt that this a problem with the networking in linux.

Not in linux, may be the way they have _used_ linux on the router ;-)

Anuradha

--

Debian GNU/Linux (kernel 2.4.13)

[FORTRAN] will persist for some time -- probably for at least the next decade.
-- T. Cheatham

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:11    [W:0.053 / U:6.384 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site