> 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.
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.

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.

So everything that goes to internet, goes from ep0.

I really believe that I've screwed some setting(s) that I don't know about.
That ALTQ thing which I was paranoid about, I suspect that since I heard that altq
does not support ipnat, so that could explain that uploads from NATted machines gets the
full speed...?
But still it's highly doubtful, since I recompiled kernel without ALTQ!