replying to Bod43, Adriano epifas wrote:
Almost 9 years late to this post but here it goes in a nutshell.
prefix-length and netmask arguments are just sanity checks.
you could assign a nat pool like 100.100.100.0-100.100.100.255 but there could be issues if you got IPs .0 or .255 because they are network id and broadcast id. But if you use arguments prefix-length or netmask, those two ip addresses would never be mapped.
So, arguments prefix-length and netmask prevent network id and broadcast address from being mapped.
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