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Stuart Kendrick

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RE: iSCSI and Jumbo Frames

Posted By Stuart Kendrick 02-22-2024 07:42:00 AM
Found In Egroup: Network Management \ view thread
My two bits: From a narrow network-only (just considering cables & switches) throughput perspective, I would argue that Jumbo Frames don't significantly improve throughput ... they just conserve a few percent on the wire (see the Jumbo Frame section starting on p.101 of https://www.skendric.com/ ...

FXOS / assessment / plus Portal Customization

Posted By Stuart Kendrick 01-20-2024 07:18:46 AM
Found In Egroup: Network Management \ view thread
Hi folks, Anyone care to comment on their Cisco Firepower / FXOS experience in general? The learning curve sounds substantial, although perhaps my sources exaggerate. We use Cisco Firepower running the ASA image to support AnyConnect Secure Client telecommuter VPN and keep thinking that we outta ...

Generative AI / Network Mgmt & Operations

Posted By Stuart Kendrick 12-31-2023 10:08:00 AM
Found In Egroup: Network Management \ view thread
We update our Strategic Plans and Network Roadmaps and so forth at the end of each year ... I'm struggling to incorporate GenAI into any of them. I don't see a way to use ChatGPT et al to change what we are doing on a day-by-day or even year-on-year basis. I expect our suppliers ... Cisco, Fortinet, ...

RE: In a little over my head...

Posted By Stuart Kendrick 12-20-2023 05:39:40 AM
Found In Egroup: Research Computing and Data \ view thread
Hi Tony, I've spent time over the decades trying to help incoming staff, consultants, sales people understand how the research business model differs from typical .com (or .org) business models ... follow the money is a useful tactic, I claim, for understanding the sociological pressures on any outfit: ...

RE: Wireless Tools

Posted By Stuart Kendrick 11-06-2023 03:33:43 AM
Found In Egroup: Wireless Local Area Networking \ view thread
I don't have RF Survey experience -- we outsource that function to an outfit called AiroPath -- but I am a fan of the NetAlly suite of hand-held network trouble-shooting tools. In the wired space, the basic test is kind of like 'ping in a box': the device negotiates Ethernet link, acquires a DHCP address, ...

building system monitoring system / E-Control

Posted By Stuart Kendrick 10-14-2023 04:58:00 AM
Found In Egroup: Network Management \ view thread
Anyone able to comment on the E-Control Systems building monitoring product? https://econtrolsystems.com/how-it-works We're looking for something to replace our aging Tempurity freezer monitoring system, and this is attracting our attention The battery-powered sensors report to a nearby gateway ...

wide-spread jumbo deployment

Posted By Stuart Kendrick 08-03-2023 06:52:00 AM
Found In Egroup: Network Management \ view thread
Has anyone enabled jumbo frames campus-wide? From a distance, seems to me that enabling jumbos makes your environment more brittle -- plenty of room for configuration mismatches [I managed to isolate a data center last week on account of jumbo frame size mismatch leading to OSPF failing to form adjacencies] ...

access-list checker tool

Posted By Stuart Kendrick 04-03-2023 05:22:00 AM
Found In Egroup: Network Management \ view thread
Anyone have an IP access-list checker to recommend? Cisco offers one ... https://cway.cisco.com/access-list/ ... but it doesn't like my access-lists: it throws the following error: Error: BDB Script failed. Check your inputs and try again. Last updated Aug 14, 2016 ... sounds like it isn't being maintained ...

recommendation for terminal server

Posted By Stuart Kendrick 04-02-2023 07:28:00 AM
Found In Egroup: Network Management \ view thread
Anyone have a brand of console server they want to recommend? i.e. a box which provides ssh and/or https access to serial ports, which are typically connected to the consoles of firewalls | switches | routers --sk ------------------------------ Stuart Kendrick Network Engineer Allen Institute --- ...

RE: Cost model / Ethernet switching platform

Posted By Stuart Kendrick 01-19-2023 05:02:56 AM
Found In Egroup: Network Management \ view thread
I hadn't considered those items ... notably, I hadn't considered the impact on the distribution layer (uplink ports et al). Thank you --sk

Cost model / Ethernet switching platform

Posted By Stuart Kendrick 01-17-2023 06:01:00 AM
Found In Egroup: Network Management \ view thread
Would anyone have a cost model they would be willing to share, which illustrates Ethernet platform cost across time? I would like to sanity-check my own against what other people have built See attachment for what the result looks like See the Switch-Cost-Model file for the model itself - No, those ...

Cost model / Ethernet switching platform

Posted By Stuart Kendrick 01-17-2023 06:00:45 AM
Found In Library: Network Management

Mitigating the impact of hard-to-secure Windows machines

Posted By Stuart Kendrick 01-12-2023 06:14:00 AM
Found In Egroup: Network Management \ view thread
We have ~120 Windows 10 machines running real-time data-acquisition functions - They tend to work in clusters -- a handful clustered around an instrument, working as a team to gather & process data - Typically, the instruments themselves are designed & built in-house, as is the custom software running ...

10G+ microwave networking

Posted By Stuart Kendrick 01-12-2023 05:53:00 AM
Found In Egroup: Network Management \ view thread
How realistic is high-throughput (>10Gb/s) microwave networking? If so, who manufactures these sorts of antenna? We have (2) buildings, just (2) blocks apart, with line-of-sight between their roofs, and we would like a ~40Gb/s path between them I have the vague impression that this flavor of communication ...

Best wishes in the New Year

Posted By Stuart Kendrick 12-24-2022 06:56:00 AM
Found In Egroup: Network Management \ view thread
------------------------------ Stuart Kendrick Network Engineer Allen Institute ------------------------------

IDF / MDF PDUs manufacturer selection

Posted By Stuart Kendrick 12-02-2022 05:19:00 AM
Found In Egroup: Network Management \ view thread
How do you pick a PDU manufacturer? What are the parameters you consider? [And here I am using the term 'PDU' to refer to the in-cabinet device, typically a given Cabinet is equipped with two of them to support redundant / diverse power feeds, their management modules daisy-chained together to present ...

RE: IDF environmental monitoring

Posted By Stuart Kendrick 12-02-2022 04:56:12 AM
Found In Egroup: Network Management \ view thread
Thank you for the responses folks, helps me to place my experience into this larger context - We'll think about buckets of water - I suspect you are facing the same staffing challenges we are ... the Facilities department can't hire enough building engineers, and the existing ones are focused on far ...

IDF environmental monitoring

Posted By Stuart Kendrick 11-29-2022 01:27:00 PM
Found In Egroup: Network Management \ view thread
I thought I was being clever, adding environmental sensors (temperature / humidity) to the APC PDUs to some IDFs. We had a flood in a building last year .. a couple of the IDFs looked like it was raining .. .and have been wanting better monitoring 2022-11-29T12:20:41-08:00 (...host name deleted ...) ...

RE: AWS Data Synch - VPN Latency to AWS cloud (SMB & CIFs)

Posted By Stuart Kendrick 11-09-2022 01:34:35 AM
Found In Egroup: Communications Infrastructure and Applications \ view thread
Sounds like a job for someone who reads pcaps. If you don't have someone on-staff, you might try one of the following consultants -- I can vouch for each of the following: Mike Pennacchi https://www.nps-llc.com Chris Greer https://packetpioneer.com Betty DuBois https://www.bettydubois.com/ Others: h ...

RE: sizing PDUs / IDFs / switches

Posted By Stuart Kendrick 11-08-2022 04:29:20 AM
Found In Egroup: Network Management \ view thread
Thank you for the assistance FWIW: Here is how I have summarized this thread to my colleagues BRIEF This is hard to predict, YMMV, build a test bed, try it out, and measure the results (with tools like an amp clamp / Kill-A-Watt) When you change equipment, rinse/wash/repeat INRUSH CURRENT ...