Poor network performance: a lot of timeouts

Kris Kennaway kris at obsecurity.org
Sun May 29 14:27:06 PDT 2005

On Sun, May 29, 2005 at 10:10:24PM +0100, Imobach Gonz??lez Sosa wrote:
> Hi all,
> Ok, I'm new to FreeBSD (for second time :)) and I'm getting an strange
> behaviour. I don't know if you could help me, but I've to try. I've read the
> handbook, manpages and search google for a while, but I don't know how to
> solve it.
> I have some machines in my network, connected to Internet with and ADSL line.
> All those machines have GNU/Linux systems (and a laptop with Windows). I've
> installed FreeBSD recently (5.4) on my desktop machine and it performs badly
> in the net.
> I'll explain: I've got a lot of timeouts using fetch, firefox, links, ftp...
> etc. I thought that could be a hardware problem, but I connected this box and
> my laptop to a hub and, using ethereal (on the laptop), I looked the traffic
> searching for troubles.
> And that's what I saw: sometimes, my FreeBSD box sends a package and receive
> no answer. Then, it have to wait for timeout and try again... and again...
> Sometimes the other peer finally answer, and sometimes not. DNS, HTTP, FTP...
> nothing seems to work properly.
> Pretty amazing, huh? Any idea? Something I must know about bsd's TCP/IP? I'm
> gonna cry... :(

This kind of thing is often caused by duplex mismatch on your NIC.

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