imac – Wiped all disks for Ubuntu installation, but “macOS Recovery over the Internet” still knows my Wi-Fi password

I wiped all disks for Ubuntu installation. The macOS Recovery partition was gone.

Decided after half of an year, to install again macOS with macOS Recovery over the Internet

If you can’t start up from macOS Recovery

If your Mac can’t start up from its built-in macOS Recovery system, it
might try to start up from macOS Recovery over the Internet. When that
happens, you see a spinning globe instead of an Apple logo during

enter image description here

I was very much surprised the this “macOS Recovery over the Internet” knows my Wi-Fi password.

He didn’t ask for password and begin download stuff off the internet.

Can you explain why he remembers my Wi-Fi password?

networking – Since UDP multi/broadcast over internet is not possible – how do games that uses UDP over internet send to thousands/millions unique clients?

I am asking from a programming point of view as I struggle to clearly understand the architecture ex online multiplayer games do when they communicate UDP packets over the internet to thousands/millions of players.

I understand that UDP broadcast and multicast is not easily available when its not internal network but across the internet.

The only other way I can see is that you then manually have to loop through each UDP connection and send the same data to each client ( just as you would if you had a lot of TCP clients ) ? is this true ? I have tried to loop through TCP connections this way and at a certain point things go slow and CPU go high.

if no 1 is the only way, then it would mean that client 1 will get things a lot faster than client number 10000 when it gets to this client in the loop ? are there techniques to get around this in any way ?

since we would have to send the same packet of data to each and every client that of course creates A LOT of network traffic but also it would i assume max out the CPU also if we all the time would have to loop through all clients for each little packet we have to send ?

Please note I am specifically talking about UDP in raw form – not interested in Web-socket versions or ‘use TCP instead’ as its the nature of UDP I am trying to understand here and have been reading all weekend here and while I have a fairly good understanding of the packet level of UDP etc. my network technical knowledge is really not good and it does not tend to stick when I try to read non-programming technical articles about networking/routers/switches/ISP support.

So hoping that someone out there could help me understand it with a programming mindset in mind how something like multiplayer games/VOIP/large IOT networks achieve the ‘real-time’ capabilities of UDP if it has to manually process and send packets onto each UDP sockets.

time capsule – Internet over WiFi working but not over ethernet (LAN)

I have run into a curious problem. When I connect my MacBook via LAN cable, the internet doesn’t work, but I can still ping other devices in my network (including the router) and also can access my network hard disc.

When I connect via WiFi to the same router, the internet works, so does anything else as it’s supposed to.
I prefer using the LAN cable as it’s faster and more reliable, so I really would like to solve this issue.

Please, note that I cannot restart my computer, because I’m running a very important operation, which cannot be interrupted and will take several weeks.

I hope someone will point me to the right direction as to investigating this issue.

enter image description here

my router: AirPort Time Capsule 802.11ac

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wireless – How do I install dkms package without internet?

Just installed Ubuntu 20.04 on my laptop, replacing windows 10. My laptop’s WiFi adapter (RTL8821CE) drivers weren’t installed automatically, and I have no ethernet port so I have to manually do it. I found a guide online on how to download it but it assumes I have internet to download dkms. So I wanted to ask how do I manually download that as well?

network protocols – Certain programs no longer connect to the internet

I’ll get straight to the point as I often get questions closed on here from what I assume is “being to detailed”.

All of a sudden OneDrive, Steam friends network, Epic Games Launcher, Microsoft Store and a handful of other apps no longer connect to the internet, as though they just can’t see the internet.

Yet I can browse the web, watch YouTube, download torrents, and generally do lots of other internet-based things with no hindrance.

It’s as though a certain network protocol just no longer works, like UDP or TCP or something, I don’t know.

I’m hoping someone who is familiar with what the above programs might have in common protocol-wise can maybe tell me what may have broke so I can fix it.

I am very PC savvy but this out-of-the-blue issue that has grounded a bunch of my programs has flummoxed me…

connect wifi internet in external hard disc dur

I installed windows 10 on an external hard disc, this last is attached to my pc laptop via usb, while starting this pc I directly access the hard disc from boot (bios) so how can I connect on wifi internet from this hard disk, thank you in advance

windows – Button needed for a mobile internet connection won’t work anymore even after reinstallating. What could be the reason?

My mom travels frequently and for that reason she uses a Windows 7 notebook and mobile internet dongle to connect to the web. It uses a little USB modem that I assume works like any smartphone because it uses a chip like one inside of it. You install a software that do the middleman work.

It is a rather old thing though, and looking into the folder where it is installed on Program Files it has many .swf extension files, so I assume the interface was made in Shockwave Flash? I’m not sure though.

The problem is that a while ago — without any out of ordinary use of the notebook — the “Connect” button that you have to click to give permission to start using available data stopped working and it keeps on a gray hue, usually it turns blue when it finds everything (which it does).

I tried to reinstall it, uninstall antivirus, check firewall permission, check if there was any leftover content on the disk like “AppData” hidden folder and restart the notebook after uninstalling again.

I thought it could be a problem with the provider, but it is not, it install and works normally on my PC, just my mom’s notebook that it doesn’t work anymore but all the other things I could check just looks the same, the network that it finds and will connect to, the antenna strength and signal; they all look the same on both systems, just the button really that you can’t click on it.

I also tested if a normal Wi-Fi connection would work on this notebook and it works fine, so it seems it is not related to a network interface controller dying out.

This thing worked on this notebook for years and stopped working for no reason whatsoever and I couldn’t find any other applications not working normally, so I don’t think it is a hardware problem.

What could be causing this? Where I could look into and how should I proceed to be sure to reinstall it completely clean again so it works like it did on my PC??

Any related things with Adobe Flash I could do or to force a connection without the need to click the button to do so??

Thanks if anyone can help me, I would appreciate any idea, and sorry for explaining it like a layman, I tried my best.