Messages in this thread | | | Date | Sat, 27 Oct 2001 09:37:29 +0600 | From | Anuradha Ratnaweera <> | Subject | Re: Other computers HIGHLY degrading network performance (DoS?) |
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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
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Debian GNU/Linux (kernel 2.4.13)
[FORTRAN] will persist for some time -- probably for at least the next decade. -- T. Cheatham
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