[SFS] networking question

[David L. Willson]

This feels like a newbie question that should be obvious to me, but it's not obvious to me, so I'll ask. 

If I have a subnet behind my router, and I want to put *part* of that subnet (a sub-subnet?) behind an interior router (sub-router?)... Can I do that? 

Example (the actual case in point): 

I have 67.42.246.112/29. It routes through 67.42.246.126. I have control of 67.42.246.126. It's not Linux, but it's not entirely brainless, either. 

Is there a way for me to carve the upper or lower /28 (67.42.246.112/28 or 67.42.246.120/28) off into an interior subnet and put it behind an actual Linux box? 

Come to look at it, I guess it would have to be the lower half, or I'd have to re-number my router. Not the end of the world, but no sense adding pointless work, either. 

I know I lose three addresses in the process for the new network, router, and broadcast address, but is it *possible*? Does it work? If so, could I get a hand setting it up? 
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