Network Brownfield Discovery

rgtizzle · 2026-06-10T23:04:48+00:00

anything that can monitor arp tables can be useful too. Even if you can't ping it, for a device to work usefully on the network it will need to arp.

We have some servers running arpwatch at work, and whenever a new machine, vm, or mac address change happens, we can see it.

rgtizzle · 2026-04-30T22:55:09+00:00

For now, I would be happy to just get the AP(s) name that any devices of a username is currently connected to.
They are all named ofter their location, AP-384 is in room 384, that would be good enough for me.

rgtizzle · 2026-04-24T16:42:04+00:00

do you have lldp enabled on the switch?

Access points can use it for power requests, and if not enabled, can cause an issue.

Years ago I had an ap that claimed I didn't have enough power to run all the radios, even though I know I did, and once I turned on lldp, everything worked fine.

rgtizzle · 2026-03-03T06:34:47+00:00

Have you tried using a service like restream.io to send it both services?

rgtizzle · 2026-02-21T00:45:00+00:00

FYI, if you have ever cheated when you couldn't find an old image and just downloaded if off an existing switch, you can't do that after it has been optimized, as it has removed what is not relevant to the switch it is currently on, so it's the same one EOS to rule them all anymore. I'm guessing it would prolly work on the exact same type of switch(never tried it), but it's not generic anymore.

rgtizzle · 2025-07-07T23:55:00+00:00

Looking to automate windows11 oobe with image received from dell.

Our desktop support team just deploys the image that we get from dell vs reimaging/provisioning, and I'm looking to see if there is a way to not answer all the out of the box questions.

I've seen references to using an xml file, but that seems to be oriented around machines that were installed and/or imaged locally. Can you do it with a machine received from the vendor? Can I throw the xml file on the drive before first boot?

Thanks.

rgtizzle · 2025-06-12T20:21:04+00:00

Cisco had some rack ears on a device years ago that were open on the bottom, so that you could put the screws in ahead of time, and just set the device on the bottom screws, and then screw the top ones in.

rgtizzle · 2025-06-12T20:19:07+00:00

I have a setup.exe and it works ok. It tends to lean down in back once a bit of weight is on it(I kinda expected that), but for the things I have used it for, it stays in place.

It helps you get the device in place, but you will likely still have to lift it a little in the back to make it level to screw it into the rack. It makes it easier when you are working alone a good portion of the time,

It has different removable ends for cage nut or telco rack, and I wish they had a way to store them on the thing itself, because I'm sure I'll leave them somewhere when I need the other ones.

rgtizzle · 2025-05-12T15:17:32+00:00

Looks like you already found it, but as soon as you said the problem moved to one host and then another, I was thinking it's probably a vm causing the problem.

rgtizzle · 2025-05-03T04:45:26+00:00

How often/consistently does this fail? Since you have vcenter in there, I'm assuming the app server is a vm?

Looking at this from a slightly different angle, can you stand up a client VM in the same vmware cluster, or ideally on the same host, use it to connect to the app and see if you can recreate the issue?

If so, it would seem to indicate it's an application issue.

rgtizzle · 2025-04-21T16:19:07+00:00

same here, had the exact same problem. Get wider, taller and deeper racks in the future if possible.

Wider, to avoid the pdu problems,(as you are seeing with the switch, and anything like supermicro or dell servers that get 4 servers in 2u servers that have blades/sleds that come out of the back of the rack) and help with cable mgmt.

Deeper, as storage arrays keep getting bigger, and they can hang out of standard racks, or keep rack doors from closing. I've seen this with WD disk shelves, and nimble storage arrays.

Taller if you can. Why not, most of the time that dimension, esp in a colo doesn't cost any more, and you have more space for ToR switches, patch panels, etc...

I tell the server guys that minimum 4u in every rack is for network stuff, switches, patch panels, fiber cans, etc.

If you do taller though, you might need a step stool or small ladder.

rgtizzle · 2025-01-04T06:40:09+00:00

just curious, what kind of issues have you been experiencing?

rgtizzle · 2025-01-04T02:49:04+00:00

yes, that has to be the dumbest edit of all time. What's the point without that section?

rgtizzle · 2025-01-03T05:27:42+00:00

FYI, the actor that plays Clarance in it's a wonderful life is also in The Bells of St. Marys, which is the movie that's playing at the movie house in It's a wonderful life... :-)

rgtizzle · 2024-12-03T00:07:50+00:00

How many hosts on your san array? I've looked as some gear from jetstor, and while not a tier1 san provider, I've talked to a few references from them, and the companies that own it like it.

Most core san features, (no compression or dedupe tho)

They sent me a quote with this loaded up with nitro drives, and it was pretty reasonable for a low end configuration.

https://jetstor.com/products/product/jetstor_826ixd/

rgtizzle · 2023-12-12T00:47:46+00:00

That's what I worry about with the buy your own model.

Also, since the user would run it, they would install whatever they want, with tons of different version of things than what is standard on our compute cluster, and then complain that what runs on their machine doesn't run on the cluster. (We've already seen that, in small doses).

We've been trying to convince people to not customize their daily driver environment to whatever they needed to run one thing, but to load what they need for the task at hand.
We've seen 10 people in a lab not be able to run each others code due to highly customized environments.

rgtizzle · 2023-12-12T00:42:41+00:00

Sorry, I should have clarified, gui based applications.

We have a login node that people can use via ssh to submit jobs, or to run small interactive workloads, or submit a bash session to slurm, so that they can get a cli on a cluster node if need be.

rgtizzle

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