Garrett Harmon wrote:
We're running into some issues at the ramp up of a quarter with our DHCP
lease time attempting to utilize the /24's we currently pool for our
main essid. We moved from 1hr. to 30 minutes, but are still running out
of leases occasionally. For instance, we have 160 users in a /24, but
due to the transient nature of wireless/classes leases that are used for
a brief moment the cycle isn't quite efficient enough.
What is everyone else using for wireless DHCP lease times? I know I can
just add another /24 to the pool, but the networks are not being
utilized enough. We want to try 15 minutes but are wondering if we will
start to run into issues related with that? Your input is greatly
appreciated!!
Hi,
We give out 30 minute leases and peak at about 700 used leases with 600
peak concurrent wireless users at the moment. We have two /22 nets (enough
for when the usage picks up towards deadline time).
Two things:
- If your using ISC DHCPd in failover mode, I believe each client's
'new' lease is for the MCLT time (renewals are then for whatever you
actually set the lease time to).
- We do:
option space MSFT;
option MSFT.release-dhcp-lease-on-shutdown code 2 = unsigned integer 32;
... to try to pursuade windows machines to explicitly release their leases
if they are shutdown while still in wireless range - there must be an
equivalent to set this DHCP option if you're not using ISC dhcp.
-James
--
James J J Hooper
Network Specialist
Information Services
University of Bristol
http://www.wireless.bristol.ac.uk http://www.jamesjj.net
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