Hello, On any given day, we see around 13,500 total wireless clients and growing. Approximately 11 percent of these clients are guests. We've allocated a /20 rfc1918 block to provide for future expansion which is NAT overloaded to a small number of public addresses. These public addresses are tunneled beyond our campus firewall. It should be noted that although the wireless itself is open (no authentication), we do require registration. Clients who associate to the guest SSID but don't register are quarantined in a secondary rfc1918 block and only allowed to the registration web server. Out of the 1,500 total guest clients, about a third of these aren't registered leading us to believe these are casual associations (people with wireless devices passing through our coverage areas). Being in a metropolitan area with a main street with above ground public transportation that cuts through the middle of the campus, we have to provide enough capacity to allow for this transient churn without impacting our clients, balancing short DHCP lease times and DHCP server horsepower.
-Ed -- Edward R. Nelson Sr. Network Systems Engineer, Information Services & Technology Boston University T (617)353-8271 F (617)353-6260 ed...@bu.edu http://www.bu.edu/tech ---------------------------------------------------------------------- Date: Sun, 20 Nov 2011 03:44:23 +0000 From: Julian Y Koh <kohs...@northwestern.edu> Subject: Guest Network Sizing -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Random poll: for those of you who have implemented guest networks with IP a= ddressing separate from your regular wireless networks, what sizing did you= use, and what kind of utilization levels are you seeing relative to your r= egular networks? Thanks! - --=20 Julian Y. Koh <mailto:kohs...@northwestern.edu> Manager, Network Transport <phone:847-467-5780> Telecommunications and Network Services Northwestern University PGP Public Key:<http://bt.ittns.northwestern.edu/julian/pgppubkey.html> ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
