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William Green

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RE: Keyless Locks in Residence Halls?

Posted By William Green 11-30-2022 12:53:05 PM
Found In Egroup: Wireless Local Area Networking \ view thread
Vendors have reported longer batter life with PSK (Assa) as opposed to .1x. Could be different between vendors, but with the additional radio airtime that makes sense. -- William Green, Director of Networking and Telecommunications The University of Texas at Austin | ITS | 512-475-9295 | gr ...

RE: Anyone just said "screw 802.1X" for Wi-Fi?

Posted By William Green 10-01-2022 09:49:37 AM
Found In Egroup: Wireless Local Area Networking \ view thread
Its a good question we talk about a lot at my institution. 1/4 of our load comes from the open guest network. Users in sparse/difficult areas (we don't have full coverage and some areas are pretty intense) often note how our open network works for them while our .1x does not (clean airtime needed for ...

RE: Wi-Fi Microsegmentation Experience

Posted By William Green 09-21-2022 07:59:17 PM
Found In Egroup: Wireless Local Area Networking \ view thread
Dependent on vendor/architecture of course. ACLs are only implemented inbound from the client on the Cisco 9800 code we are running (we hope they'll change this). The ACL prevents the client from talking to anything but the routers. The SVIs of the routers are all in the same VRF. That VRF goes through ...

RE: Wi-Fi Microsegmentation Experience

Posted By William Green 09-20-2022 06:48:09 PM
Found In Egroup: Wireless Local Area Networking \ view thread
We are past our first month and I said I would report back to the thread when the smoke cleared. The microsegmentation has been a non-event. Our Service Desk was pressed to find related incidents, with no escalations to Networking. Less than 0.25% of devices were not microsegmented peak-day (>84,000 ...

RE: Wi-Fi Microsegmentation Experience

Posted By William Green 07-15-2022 03:02:57 PM
Found In Egroup: Wireless Local Area Networking \ view thread
How is this different than "P2P Blocking Action = Enabled"? - Matt It may not be different - depends on your environment and goals. For us, P2P blocking would not block unsolicited connections from the rest of campus (the wired world of ~80K devices), and we wanted some nuanced control of that ...

RE: Wi-Fi Microsegmentation Experience

Posted By William Green 07-14-2022 05:45:32 PM
Found In Egroup: Wireless Local Area Networking \ view thread
Just one experience/perspective. There may be approaches to make something work that wants to communicate, however, for most the simple approach is going to the portal and selecting the "Unprotected" profile to return the device to where it was before this change (e.g. set the AppleTV to "Unprotected", ...

RE: Wi-Fi Microsegmentation Experience

Posted By William Green 07-13-2022 10:44:05 PM
Found In Egroup: Wireless Local Area Networking \ view thread
The goal of the microsegmentation is to reduce attacks from unsolicited connections. That is just one attack vector. Terry Gray's Perimeter Protection Paradox: the protection provided by a perimeter is inversely proportional to the size of the perimeter. With n=1, you have the greatest protection while ...

Wi-Fi Microsegmentation Experience

Posted By William Green 07-13-2022 05:24:21 PM
Found In Egroup: Wireless Local Area Networking \ view thread
Experience on micro-segmentation of Wi-Fi: Its working so far with hardly a peep from the community (you'd think nothing happened). On May 22nd we deployed network segmentation down to the individual device as the default on Wi-Fi (isolation group of n=1). Users may go to a portal and opt out on a per ...

Wi-Fi Usage Trends

Posted By William Green 07-11-2022 07:38:44 PM
Found In Egroup: Wireless Local Area Networking \ view thread
We've had 104% growth in authenticated connect hours from Fall 2019 (pre-covid) to Spring 2022 (see chart). Campus population is lower than indicated by the data (from my non-scientific walking around). I cannot rely on the device counts as operating systems randomize MACs more aggressively. In March ...

UT Austin Hiring Network Engineers

Posted By William Green 06-01-2022 08:43:02 AM
Found In Egroup: Wireless Local Area Networking \ view thread
The University of Texas at Austin is seeking Network Engineers who are comfortable in large complex academic network environments: Senior Network Engineer ($116,000+) providing Wi-Fi primarily, and we would like to see switch and router Network Engineer ($80,00+) providing Wi-Fi, switch, router ...

RE: Guest Wi-Fi captive portal removed

Posted By William Green 02-25-2022 08:29:20 AM
Found In Egroup: Wireless Local Area Networking \ view thread
Our campus currently believes it is a problem that students, faculty, and staff end up on the open SSID (no portal). The ISO implemented a notification system when logins to campus services occur from the open SSID. Due to these concerns we have it limited to the minimum current FCC broadband speed (25Mbps), ...

RE: Parking lot switching - Need ideas

Posted By William Green 02-23-2022 08:20:00 AM
Found In Egroup: Network Management \ view thread
Amongst the many solutions for harsh environment switches and enclosures, depending on the situation, we also utilize extended reach twisted pair cable. In our testing it tends to be able to meet specs for 2.5Gpbs and 30 watts at 200 meters.

RE: Wireless Guest Access

Posted By William Green 02-10-2022 09:26:00 AM
Found In Egroup: Network Management \ view thread
We do not require accounts for access. Simply connect to the SSID (some restriction apply, no AUP click-through). Our guests like it. https://ut.service-now.com/sp?id=kb_article&number=KB0011686 It causes issues when university persons/devices end up on the guest SSID (lots do). It causes more connections ...

802.11 Protocols and Spectrum Usage History

Posted By William Green 02-04-2022 02:28:08 PM
Found In Egroup: Wireless Local Area Networking \ view thread
Its been a while since we sent this chart out. I'm looking forward to adding 6GHz to it. This chart is limited by reporting from our management systems in use at the time. For example, the 802.11a surge in Fall 2014-Fall 2015 was mostly an artifact of Airwave reporting Cisco 802.11ac@5GHz as 802.11a@5GHz ...

RE: Elevator communication: Cellular or connected to your network

Posted By William Green 01-21-2022 07:49:24 AM
Found In Egroup: Network Management \ view thread
We're still planning on analog for our major campuses due to its runtime and cost based on current conditions -- which could change. There was already a copper mine in the ground, and maintaining it and the analog gateway infrastructure is currently less than our calculations for UPS runtime required ...

Outside Plant Documentation

Posted By William Green 12-15-2021 04:15:08 PM
Found In Egroup: Communications Infrastructure and Applications \ view thread
I'm curious what large campuses are using to document their outside plant pathways (ducts, manholes, tunnels, aerial, etc) and cabling using those pathways? -- William Green, Director of Networking and Telecommunications The University of Texas at Austin | ITS | 512-475-9295 | green@austin.ut ...

UT Austin Seeking Wireless Network Architect

Posted By William Green 11-30-2021 08:00:22 AM
Found In Egroup: Wireless Local Area Networking \ view thread
The University of Texas at Austin is seeking a Wireless Network Architect ($130K+). https://utaustin.wd1.myworkdayjobs.com/en-US/UTstaff/job/Wireless-Network-Architect_R_00017069-1 We're a Cisco environment (EA), 9800 controllers, DNAC, 10K APs, 300K+ devices, and planning lots of growth. Not ready ...

RE: Migrating to eduroam SSID only - issues while migrating?

Posted By William Green 10-14-2021 05:30:23 PM
Found In Egroup: Wireless Local Area Networking \ view thread
Some of our users assert the guest network is more reliable than our authed networks, and some say better performing. We actually QOS guest lower-- so it should be worse (in addition to overall limit of FCC broadband speed we enforce on guest). We hear it most in buildings with sparse coverage. Our ...