>> NAT+ALTQ machine. it worked fine until network got larger (>120 machines).
>> 
>> fxp0 is PXE bootable LAN interface, ex0 is WAN interface
>> 
>> now it boots fine, works for some time (like 1-20 hours) then it 
>> self-reboots.
>> 
> I'm not sure if this is relevant, but I think I had my AMD Athlon machine 
> rebooting itself on random occasions. This was netbsd-2.0 and the kernel and 
> userland it was running was compiled with '-mcpu=pentium'. I did 'cvs 
> checkout -P -rnetbsd-2 src' to get the latest fixes going into upcoming 2.0.1 
> and rebuilt everything without any -mcpu options. Since then, everything has 
> been rock solid.
>
i know this problem (not only with athlon) - i compile kernel with 
-march=i386