Hi Uwe,

You wrote:

> I am using the netbsd-current kernel. after booting the system all works 
> fine. after some time (sometime five days, sometime four weeks,  ...) the 
> server do not recive any more packet over the network interfaces. the 
> logfile reports:
> 
> /netbsd: WARNING: mclpool limit reached; increase NMBCLUSTERS
> 
> I changed the the value of NMBCLUSTERS to 2048, 4096 and 16384. but after 
> some time the server always reports "mclpool limit reached".
> 
> can you give me any hints, what is a useful value for NMBCLUSTERS?
> could it be any other problem?

This sounds like some sort of packet leak.

Try to look at

netstat -ms; netstat -s 

to determine _what_ sort of buffers is overflowing... This will help 
diagnosis.

Regards,
	-is