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Julian Koh

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RE: Transition to Eduroam

Posted By Julian Koh 04-10-2024 01:47:26 PM
Found In Egroup: Communications Infrastructure and Applications \ view thread
We had both our branded "Northwestern" SSID and eduroam running in parallel for years. Back in 2020-2021 or so we started a communication campaign to get people to move off of the branded one. With the pandemic, we delayed our deactivation of the branded SSID by a few months, but it all went fairly well. ...

RE: GPU needs

Posted By Julian Koh 03-28-2024 07:18:43 AM
Found In Egroup: Network Management \ view thread
Here are the public pages on NU's high performance computing clusters that we run centrally. https://www.it.northwestern.edu/departments/it-services-support/research/computing/quest/ If you want to talk in a little more detail, drop me a line. If you want to talk in a lot more detail, I'll have to ...

RE: OSPF Areas

Posted By Julian Koh 03-05-2024 08:47:06 AM
Found In Egroup: Network Management \ view thread
Heheh.....more fun fuzzy memories on this one. I remember way back when we first made the switch to OSPF from RIP, and we first did many of the bells and whistles in terms of breaking up the campus by area (basically each distribution routing site was its own area), route aggregation whenever possible ...

RE: iSCSI and Jumbo Frames

Posted By Julian Koh 02-20-2024 06:44:27 PM
Found In Egroup: Network Management \ view thread
We did this years ago in our data center. No problems that I can remember. -- Julian Y. Koh Director, Telecommunications and Network Services Northwestern Information Technology 2020 Ridge Avenue #331 Evanston, IL 60208 +1-847-467-5780 Northwestern IT Web Site: https://www.it.northwestern.edu/ ...

RE: Working with other networks on campus

Posted By Julian Koh 02-13-2024 08:46:46 AM
Found In Egroup: Network Management \ view thread
Argh. Was trying to respond to Chuck's comment about ATM networking, but I guess selective email quoting still doesn't work on this system. :) To contribute something more substantive, we also have had a mandate for the last few decades that said that if you're in a university owned building, you have ...

RE: Working with other networks on campus

Posted By Julian Koh 02-13-2024 08:19:35 AM
Found In Egroup: Network Management \ view thread
That is one of the best ways of describing those times I've heard in a while. Oh the memories..... :)

RE: State of Traffic Shaping

Posted By Julian Koh 12-07-2023 09:54:02 AM
Found In Egroup: Network Management \ view thread
We gave up on traffic shaping years ago when PacketShaper development stalled and wasn't able to keep up with the amount of bandwidth we needed, plus the costs of bandwidth went down enough that it wasn't worth it for us to continue to pay for an appliance that was for us at least just going to make ...

RE: Branded Caller ID Service

Posted By Julian Koh 10-03-2023 07:34:50 AM
Found In Egroup: Communications Infrastructure and Applications \ view thread
We've asked for a high level briefing on this from our carrier as well just to understand how these services work. A lot of the simpler more clear cut rules with respect to caller ID have definitely been thrown out the window in recent years. :) -- Julian Y. Koh Director, Telecommunications and ...

RE: MacOS Sonoma Problems

Posted By Julian Koh 09-29-2023 01:27:12 PM
Found In Egroup: Wireless Local Area Networking \ view thread
My Sonoma machine as well as a coworker's were able to connect to eduroam on our campus just fine. At the risk of going too much off on a tangent, I've got a sample size of n=1 so far with my iPhone 11 and iOS 17 (and 17.0.1 and 17.0.2). The day after upgrading, I came to campus, and it wouldn't join ...

RE: Blue Light Phones

Posted By Julian Koh 09-25-2023 11:31:55 AM
Found In Egroup: Communications Infrastructure and Applications \ view thread
Sounds interesting, Arthur. Just curious - Is there an option to make the network path be primary and the cellular dialup be secondary? -- Julian Y. Koh Director, Telecommunications and Network Services Northwestern Information Technology 2020 Ridge Avenue #331 Evanston, IL 60208 +1-847-467-5780 ...

RE: Blue Light Phones

Posted By Julian Koh 09-25-2023 09:34:02 AM
Found In Egroup: Communications Infrastructure and Applications \ view thread
We connect those to analog gateways that register to our Cisco UC Manager infrastructure. Cellular options are being explored for our alarm panels, but we have not really been looking too hard for an option for our Ramtel phones. We also have a fair installation of Valcom IP-based emergency phones that ...

RE: Cable Tv in Dorms

Posted By Julian Koh 08-25-2023 02:32:07 PM
Found In Egroup: Communications Infrastructure and Applications \ view thread
We have been using Xfinity OnCampus streaming for a number of years now. Prior to that we were doing Video Furnace/Haivision multicast streaming going back to 2001. And for many years before that our president was telling students that they were there to learn, not watch TV. :) :) -- Julian Y. ...

RE: Experience in EAP-PEAP to EAP-TLS Conversion

Posted By Julian Koh 08-25-2023 10:43:13 AM
Found In Egroup: Communications Infrastructure and Applications \ view thread
We are also considering such a move. Vantage just finished helping us do an analysis of things over the past months; here's a link to one of the threads that Jon Young had related to a survey that was circulated along with the results: https://connect.educause.edu/discussion/certificate-based-auth ...

RE: wide-spread jumbo deployment

Posted By Julian Koh 08-03-2023 08:50:13 AM
Found In Egroup: Network Management \ view thread
This was a long time ago, and I may have some (all? :) ) of the details wrong, but back around 2008 or so we enabled jumbo frames (can't remember the exact size) across our backbone campus network because we were rolling out MPLS-based VRFs, and I think we needed the extra size for the MPLS tags. Only ...

RE: Current & Future Network backup up power approach

Posted By Julian Koh 07-05-2023 12:56:12 PM
Found In Egroup: Communications Infrastructure and Applications \ view thread
Answering for Northwestern: 1.) We use a combination of generators and UPSes of various (but not unusual :) ) sizes. 2.) All campus routers have UPS and generator backup power. Closet switches have only UPS. 2.1) All UPSes are monitored, primarily w/ SolarWinds 2.2) Runtime for standalone UPS is ...

RE: Discontinuance of Copper to Deliver PRI to BYOB

Posted By Julian Koh 06-09-2023 02:25:18 PM
Found In Egroup: Communications Infrastructure and Applications \ view thread
We moved to SIP trunks a number of years ago, although we kept some PRIs around as backup/redundant links for a while until they got too expensive. Note that in the case of our primary local/inbound service, we did not go with a BYOB/internet approach but had the carrier bring in a private fiber circuit ...

RE: IPv6 geolocation errors at Microsoft

Posted By Julian Koh 06-09-2023 01:33:15 PM
Found In Egroup: Network Management \ view thread
Thanks Jim along with other folks who sent some feedback! The problem cleared up yesterday afternoon, right before we had set up another non-VPN IPv6 subnet to test, so unfortunately we don't know if it was some random gremlin in some system somewhere, if the feedback we submitted via our support ticket ...

IPv6 geolocation errors at Microsoft

Posted By Julian Koh 06-08-2023 11:57:00 AM
Found In Egroup: Network Management \ view thread
Hey all, Does anyone know of a good pathway to engage Microsoft on what appears to be a geolocation issue? We don't provide IPv6 generally to most of our campus by default, but we do have it enabled on our remote access VPN. We started getting reports yesterday morning that people who connect to our ...

RE: SIP Service - Fire Panels/Elevators Stable Lines

Posted By Julian Koh 06-07-2023 03:56:01 PM
Found In Egroup: Communications Infrastructure and Applications \ view thread
The police run the monitoring system for all the alarm panels. I'm pretty sure it can tell them about problems with the IP connections as well as the dialup ones. The dialup connections get tested every night with a schedule of which panels call in when. Not sure if the IP side is getting monitored/alerting ...

RE: SIP Service - Fire Panels/Elevators Stable Lines

Posted By Julian Koh 06-07-2023 03:45:45 PM
Found In Egroup: Communications Infrastructure and Applications \ view thread
Totally echo Geoff's comments. Here at Northwestern, our alarm panels (ADT) have a primary communication pathway of the IP network and a secondary/backup connection of an analog dialup line. When those were going to our old Nortel SL100->DMS100->MCS5100->CS2100 phone switches, they were all fine. When ...