kernel: Out of Memory: Killed process 1749 (named).

[netmask]

>> How (else) can this be prevented?
>
> Find out what is consuming more memory you have. Do you have enough swap 
> space? Alexander

You can also limit usage in your limits.conf file for specific users or user 
groups.. (If you're running ISC's named, I pray for your sake, that you are 
running in a chroot'd environment as a non-root user..)

lsof  is your friend.. you can see the mem hogs there..  or at a much lesser 
informative level, just 'top' and sort by mem usage.. maybe you have a out of 
line program looping somewhere.