Howto NAT A.B.C.0/24 -> X.Y.Z.0/24 ?

[Dax Kelson]

I'm using RH7.2 with the 2.4.9-31.

I would like to NAT one /24 network into another /24 network.  

I need to hold the last octet constant: 


A.B.C.1 --> X.Y.Z.1
A.B.C.2 --> X.Y.Z.2
... (on down through the entire /24)

Is there a single (or two) command(s) that would do this, or do I need to
have a DNAT and SNAT rule for each IP in the network?

Dax