Im wanting to run smoothwall or ipfire which routerboard will do this?.
by default - none.
if you have enough linux knowledge you can make it, but then - you wouldn’t ask this question. I know OpenWRT guys have make it working for RB4xx and RB6xx, so you can browse their forums to see what obstacles they had to overcome.
I tried to add a longer post earlier, but seems like it disappeared (due to a forum glich?).
Anyway, I’ll try to make it short now. Supposedly RouterOS is using linux kernel, which is a GPL licensed software. OpenWRT kernel works more or less fine, but where can I get the sources of your variant of linux kernel? Thanks.