Subject: Old problem?
To: None <>
From: Tomasz Marciniak <>
List: tech-security
Date: 06/29/2002 13:27:01
How do I protect my system against that simple DoS:

It hangs NetBSD 1.6A, NetBSD 1.6BETA3 (both Pentium III with
256M RAM) in about 10 sec.

In /var/log/messages:

Jun 26 19:20:08 felix /netbsd: WARNING: mclpool limit reached; increase NMBCLUSTERS

The kernel was compiled with:

options         NMBCLUSTERS=4096

The login class definition of a user who runs the
evil code is:


The solution suggested in:
does not help.

Tomasz Marciniak