I’m a technical kinda guy, doing technical kinda stuff.

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Joined 1 year ago
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Cake day: September 27th, 2023

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  • Blu-Ray USB drive and M-Discs is about the best you can get at present. Keep the drive unplugged when not in use, it’ll probably last 10-20 years in storage.

    Seeing as there hasn’t been much advance past Blu-ray, keep an eye out for something useful to replace it in the future, or at least get another drive when you notice them becoming scarce.






  • Letting it ring has no impact. They have autodiallers that call, and when someone picks up, only then is that call assigned to someone in the call centre.

    You can often tell this because there is a marked delay in the response to your initial “Hello?”. Long enough that you can reliably just hang up if you don’t hear a response in two seconds.

    If it’s a real person who actually wants to call you and they you call again straight away, you can just shrug off your hang-up as a network issue.


  • Dave.@aussie.zonetoLinux@lemmy.mlCompanies that use desktop Linux
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    25 days ago

    how the IT team tries to justify being locked into Microsoft, and then telling me I could potentially become a point of vulnerability

    Because they can manage and control all the windows PCs , pushing updates automatically, restricting what users can do locally and on the network, they have monitoring tools and whatever antivirus and antimalware tools they have, and are able to easily manage and deploy/remove software and associated group licensing and so on and so forth.

    Meanwhile you’re a single user of unknown (to them) capabilities that they now have to trust with the rest of their system, basically.

    The first rule of corporate IT is, “control what’s on your network”. Your PC is their concern still, but they have no effective control over it. That’s why they’re being a bit of a pain in the ass about it.








  • Have a look here at the ICMP source code in the Linux kernel at line 400. That is the ICMP reply code.

    At lines 433/434 you can see the collection of the source and destination MAC addresses from the incoming packet. The source is just lifted directly from the packet, the destination is done with a helper function that presumably looks at which interface it arrived on and returns the MAC address of that interface.

    Lines 441 onwards construct the reply packet and push it to the generic ICMP transmit function (which is a bit higher up in the source code), which then pushes it on to the network stack.

    Hope that gives you an idea of how it works internally! It’s really only a slightly more detailed version of the actual standard, there are a few checks to make sure that we are not exceeding network rate limits in the stack and etc, but it’s a quite simple bit of code.

    Added edit: it’s “simple” at this point because a lot of the work has already been done. The packet has arrived via the network stack, it has been determined to be an ICMP packet, and it was sent here to this function. There are already functions that send packets out via the network stack, so this chunk of code just builds an appropriate packet and hands it on to be sent.