Shriking ranges that are already in use??

[project722]

Hey all,

We have a few scopes in DHCP that were made according to inaccurate
projections. Now we are being forced to shrink these ranges.

For instance, all of our /25's will need to become /27's. We have a
legitimate concern that the gateway for the new /27's may already/will
probably be leased out from the original /25.

What can we do to make this a smooth transition and are there any other
considerations that we need to be aware of?
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