I do not believe that SMP is built into the kernel by default. You could roll 
your own kernel and create a custom image.

Quoting MeX <mex at localnet dot sk>:

> is exist version of m0n0wall with smp support?
> 
> MeX
> mex at localnet dot sk
> 
> 
> 
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Chet Harvey
Pitbull Technologies <http://www.pittech.com/> 
Protecting your Digital Assets
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