Android at least flags networks "No internet access detected, won't automatically connect" if probes fail. This does happen on known/saved networks if they fail long enough, but seems very quick for an automatically found open network. I could see that behavior causing a significant reduction in steady state DHCP usage if a portal is in place, although could still result in bursts of many leases used one time whenever large numbers of new devices arrive (beginning of terms, large guest events). Although occasionally filling up due to guests for short intervals may be not as big of a deal if all the usual devices already have leases then (especially if most student/employee mobile devices are on a pool behind 802.1x anyways and open is TVs and game consoles and such).
On Tue, May 17, 2016 at 6:27 AM, Osborne, Bruce W (Network Services) < [email protected]> wrote: > I can only speak from our experience. > > > > We went from portal to no-portal and saw a large increase in dhcp lease > usage. > > > > As best as we can determine, if there is not a portal, many mobile clients > keep probing to verify that Internet access is still available. This lets > the device inform the user there is a usable wireless Internet connection > available. > > > > If there is a portal, they seem probe less aggressively. > > > > > > > > *Bruce Osborne* > > *Wireless Engineer* > > *IT Network Services - Wireless* > > > > *(434) 592-4229 <%28434%29%20592-4229>* > > > > *LIBERTY UNIVERSITY* > > *Training Champions for Christ since 1971* > > > > *From:* Trent Hurt [mailto:[email protected]] > *Sent:* Monday, May 16, 2016 9:15 AM > > *Subject:* Re: One more round- finer point on Open Networks in Dorm > > > > I’m curious how a portal solves dhcp capacity issues. > > > > *From:* The EDUCAUSE Wireless Issues Constituent Group Listserv [ > mailto:[email protected] > <[email protected]>] *On Behalf Of *Osborne, Bruce W > (Network Services) > *Sent:* Monday, May 16, 2016 7:51 AM > *To:* [email protected] > *Subject:* Re: [WIRELESS-LAN] One more round- finer point on Open > Networks in Dorm > > > > > > Agreed. > > > > We had a wide open Guest network for a while until there were DHCP > capacity issues. We then inserted a portal to fix that. > > > > > > *Bruce Osborne* > > *Wireless Engineer* > > *IT Network Services - Wireless* > > > > *(434) 592-4229 <%28434%29%20592-4229>* > > > > *LIBERTY UNIVERSITY* > > *Training Champions for Christ since 1971* > > > > *From:* Brian Helman [mailto:[email protected] > <[email protected]>] > *Sent:* Friday, May 13, 2016 11:50 AM > *Subject:* Re: One more round- finer point on Open Networks in Dorm > > > > Lee, I posed this question back at NERCOMP. You may want to also know the > answer to “who has done this and switched back to a non-open environment?”. > > > > -Brian > > > > *From:* The EDUCAUSE Wireless Issues Constituent Group Listserv [ > mailto:[email protected] > <[email protected]>] *On Behalf Of *Lee H Badman > *Sent:* Friday, May 13, 2016 9:02 AM > *To:* [email protected] > *Subject:* [WIRELESS-LAN] One more round- finer point on Open Networks in > Dorm > > > > > > I asked this back in February, and would like to go one more round with > some specifics applied. Direct response off-list is OK if you prefer. Let > me ask it two ways: > > > > · Who runs a wide-open WLAN in their dorms? I’m talking no > encryption, no portal, no nothing. Just get on and go, baby. > > · Same question, but with simple PSK/WPA2 added. > > > > No ISE, no Clearpass, no MAC registrations. For those doing this, do you > rate-limit? Restrict access only to Internet? Block WLAN clients from > directly reaching each other? Any other restrictions/policy configs applied? > > > > Thanks, > > > > Lee Badman > > > > ********** Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at > http://www.educause.edu/groups/ > <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.educause.edu_groups_&d=AwMGaQ&c=SgMrq23dbjbGX6e0ZsSHgEZX6A4IAf1SO3AJ2bNrHlk&r=rtlMYUF4nwLIYnoG0qXTf9aFc5RLK7DMyf8lTMu__vs&m=TvAuSlsREJ9X4N_0i1peynRMWzLje-rUZgvK4XBcmBM&s=1zgjb1XO7lBZgQbZKKuvJWqf2FVPCmM4OFuPVX6nPX8&e=>. > > > ********** Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at > http://www.educause.edu/groups/ > <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.educause.edu_groups_&d=AwMGaQ&c=SgMrq23dbjbGX6e0ZsSHgEZX6A4IAf1SO3AJ2bNrHlk&r=rtlMYUF4nwLIYnoG0qXTf9aFc5RLK7DMyf8lTMu__vs&m=TvAuSlsREJ9X4N_0i1peynRMWzLje-rUZgvK4XBcmBM&s=1zgjb1XO7lBZgQbZKKuvJWqf2FVPCmM4OFuPVX6nPX8&e=>. > > > ********** Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at > http://www.educause.edu/groups/ > <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.educause.edu_groups_&d=AwMGaQ&c=SgMrq23dbjbGX6e0ZsSHgEZX6A4IAf1SO3AJ2bNrHlk&r=rtlMYUF4nwLIYnoG0qXTf9aFc5RLK7DMyf8lTMu__vs&m=TvAuSlsREJ9X4N_0i1peynRMWzLje-rUZgvK4XBcmBM&s=1zgjb1XO7lBZgQbZKKuvJWqf2FVPCmM4OFuPVX6nPX8&e=>. > > > ********** Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at > http://www.educause.edu/groups/. > ********** Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at > http://www.educause.edu/groups/. > > -- Jeremy Mooney ITS - Bethel University ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
