128M of memory is the minimum requirement these days for m0n0wall.  You 
might want to up it to at least the minimum and test again.  However, 
running a firewall in a VM is probably a bad idea.  I've heard other 
people here having problems doing what you are doing, and yet again 
other people having no problems.  Solutions are not common as far as I 
remember.

Roland Giesler wrote:
> I have a VMWare Server 1.0.3 build 44356 that runs on Windows XP.  I
> had wanted to run some Linux distro, but the machine simply refused to
> even load the kernel so I installed XP.  It's an IBM xSeries 200
> server with a PIII 800 MHz processor and about 768MB of RAM.  I can
> load m0n0wall on the box without any problem, but I want to also run a
> spam filter on it, hence VMWare.
>
> It's runs M0n0wall 1.231 in one VM and ESVA Spam filtering & mail
> stats in another VM.
>
> XP is on SP2.
>
> Problem is m0n0wall hangs quite often for no apparent reason.  It
> happens that it runs for a day without problems and then, when it
> freezes, the CPU is at 100% with the m0n0 VM taking all available
> cycles is seems.
>
> There was an issue like this towards the end of 2006 with an earlier
> version of m0n0wall, but that seems to have been resolved, yet I have
> no idea what to do to fix this.
>
> Is this a VMWare issue or is is m0n0wall?  The other VM (ESVA) runs
> fine, uses much more RAM and CPU than m0n0wall, yet never freezes,
> which to me seems to point at something thats wrong with m0n0wall.  On
> the other hand I have other m0n0walls running the same version without
> any problem, but none on a VMware VM.  I have changed the amount of
> RAM allocated to the m0n0 VM, and am on 64M at this stage, but none of
> it seems to make a difference.
>
> Insights, pointers or comments please?
>
> regards
>
>
>