Re: [WIRELESS-LAN] wireless DHCP lease time

[Steve Hess]

We run 4 /23's (one per class) with 4 day lease times.  It's very tight right now for freshmen and sophomore's but lots of room for juniors and seniors.  Each class is about 350-450 students.  I'm looking to add another /23 per class to provide some head room.  We run 4 day lease times for the forensic aspect of it.  Definitely seeing more wireless devices this year.  Upperclassmen are registering computers.  Underclassmen are registering a computer (or two), an iPhone/iPod, and a gaming device.  For those of you running the /22's and /20's, you don't see performance issues with broadcast domain's that large?  Our wireless vendor (Alcatel/Aruba) highly suggested shrinking the broadcast domain (we had been running one /22 for all students). Steve heath.barnhart wrote: We run 30 minute leases for most of SSIDs, no problems. We saw an unexpected boost in wireless usage this semester though, and had to go from /22 networks to /20 to accommodate the new users and leave room for expansion. Heath 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!! *Garrett Harmon* Network Engineer Office of Information Technology The Ohio State University 614.292.2122 (o) 614.747.5539 (c) ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. -- ----------------------- Steve Hess Network Administrator Wheaton College Phone: 508-286-3404 Fax: 508-286-8270 ----------------------- ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.