Best practice on removing IP Scopes(subnets)

Christof Chen christof at
Fri Apr 24 18:25:00 UTC 2009

Oops, typo. I meant: "one hour at 3:25..."  The lease would be valid
long after the scheduled maintenance starts.

> It depends on what you want to achive: The idea behind the current
> implementation was that if you know you will be doing maintenance on a
> certain subnet beginning tonight at 3:30 (making it unusable for
> routing), it isn't nice to give the customer an IP valid for e.g. one
> hour at 2:25...
> "deny after" assures you that the subnet is empty after the stated time
> plus min-lease-time.
> In conjuction with "allow after" you can be sure that all clients have
> transitioned to a new pool _without_ manually reducing lease times
> several times and restarting dhcpd.
> Christof Chen

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