Theoretical Max Lease Time
dhcp1 at thehobsons.co.uk
Thu Aug 31 12:00:56 UTC 2006
HAWKER, Dan wrote:
>What is the theoretical maximum lease time that you can set in DHCPD???
About 30 years I think, as in end time must be less than "now +
2^31-1 seconds" and also less than the end of time as the system
knows it (2^31-1 seconds after midnight 1st Jan 1970) which IIRC is
sometime in 2036.
>I have a series of test VMware player machines a few of my developers use.
>The IP address and hostname is allocated dynamically by dhcpd using a class
>that matches VMware first 3 octets in its generated MAC addresses.
>They boot these VMs randomly via PXE, but what they boot changes as they
>develop a new package (automatic RPM/ANT build and a generated kickstart
>file). It'd be nice to be able to set the lease time fairly high to ensure
>they (within reason) always get the same IP address and hence hostname.
Bear in mind that should they change their client ID then they will
still get a different address, and in the absence of a client id then
the address will change with any change of virtual MAC address (are
they random or static MAC addresses ?).
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