[CentOS] DHCP static hosts and subnet configuration

[John R Pierce]

Filipe Brandenburger wrote:
> My personal opinion, if you're using RFC1918 addresses for internal
> networks, you should only use 255.255.255.0 netmasks everywhere, even
> though it's a network for one machine only. Dealing with netmasks is a
> PITA, and should be avoided unless there's a real reason to use it,
> for instance with valid IPs.
>   

on a large WAN, /24 vlan segments are often too small.    we use /20 
slices of 10-net for VLAN's here.   /all/ 10-net vlans are /20.  we also 
use some 172.16-31 and 192.168 spaces, those are all /24