RE: Choosing length of lease

["Hibbs, R Barr (rbhibbs)" <[e-mail]>]

We selected a default lease length of 21 days, however, most of our clients 
reinitialize their stack at least once per day (via an automatic mechanism 
in the client that randomizes reinitializations during the 2 a.m. to 4 a.m. 
window).  This default lease value is a compromise that allows the majority 
of users to take vacations without their assigned IP address changing, but 
permits less-than-30-day recovery of dis-used leases.

For mobile users (a group we currently do not support) the lower bound on 
lease lengths would depend on the update cycle for DNS -- many servers 
require a DNS entry for a client that agrees with the server request -- so 
very short lease times could present an unwelcome burden on DNS.  I would be 
reluctant to allow a really long maximum lease time because of the frequency 
of office moves and the need to eventually recover disused addresses, but I 
am not really able to quantify a maximum time either.

 --Barr Hibbs
  Pacific*Bell
  370 Third Street, Room 207
  San Francisco, CA  94107-1279
  [phone]
  [e-mail]


 ----------
From: dhcp-v4
To: Multiple recipients of list
Subject: Choosing length of lease
Date: Fri, 8 Nov, 1996 6:35


(1) At your own site, how long do you make leases and why did you choose
    this time?

(2) Are there lease-lengths that you would consider to be a lower-bound
    or upper-bound for any ALL practical uses?  If so, what would you
    be trying to avoid by staying above/below this bound.


John Wobus
[e-mail]