On Sun, Apr 06, 2003 at 01:09:44AM +0300, ckain@iki.fi wrote:
> > That kind of speed sounds suspiciously similar to what you'd see if your
> > Ethernet cards were failing to negitiate an agreement for full/half
> > duplex.  
> > 
> > --jkl
> 
> How that could be the problem, if the uploads works fine behind the NAT.

This kind of problem is very timing sensitive. The extra delay/buffering
caused by going through the router is often enouth to mitigate the effect
of the problem.

> My network card(s) are ISA 10Mbps 3com 509C. I don't know if it possible to change
> half/full duplex negotiations on these cards. ifconfig does not seem to support changing
> medioptions on these cards.

These cards are half-duplex only.

> 
> My network is like this
> 
> i486 (ep0 and ep1)
> 
> ep0 goes to cablemodem
> ep1 goes to switch, and behind that are my two other computers, which the i486-machine
> provides NAT:ed internet connection using ipnat/ipfiler.

Maybe the cable modem expect full-duplex ? This would be surprising though.
Does netstat -i show lots of collisions or errors on ep0 ?

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 24 ans d'experience feront toujours la difference
--