• Require a password in single user mode
• Clear the console each time a user logs out
• Increase NMBCLUSTERS for network performance

Lockout single user mode

You might have read that you can recover the root password in OpenBSD through single user mode because it gives you root access automaticly. That isn't secure enough for me, so edit /etc/ttys(5) and change the console from secure to insecure. Remember your password though. There is no way to recover it if you lock yourself out of single user mode.

Clearing the console each time a user logs out

To do this you must add a line in /etc/gettytab(5). Change the current section:

P|Pc|Pc console:\
        :np:sp#9600:

adding the line ":cl=\E[H\E[2J:" at the end, so that it ends up looking like this:

P|Pc|Pc console:\
        :np:sp#9600:\
	:cl=\E[H\E[2J:

Increasing NMBCLUSTERS

#:/home> cd /
#:/> sudo config -e -o bsd.new bsd
OpenBSD 3.2 (GENERIC) #25: Thu Oct 03 22:06:37 CDT 2002
    deraadt@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC
Enter 'help' for information
ukc> nmbclust 8192
nmbclusters = 8192
ukc> quit
Saving modified kernel.
#:/> sudo cp bsd bsd.old && sudo mv bsd.new bsd
#:/> sudo reboot