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Cake day: 2025年6月5日

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  • The router you need depends on your connection bandwidth and whether it uses pppoe. Also what worth considering: Do you want the router to host any VPN tunnels? Do you want some headroom for the future?

    The hEX Refresh test results show that it could handle maybe 600 to maybe 800Mbps, depending on the traffic and configuration (looking at somewhere between the 512 and 1518 byte result for mixed traffic routing). It will do less with pppoe overhead. And less still if it’s hosting one end of a tunnel. But the price is good. Honestly I don’t think it would be overkill for most connections.

    For me I would probably also consider the hAP ax S at this performance level. A little bit more money, but with wifi.

    If you want more performance the hAP ax2 is the next step up for not much more money. It will handle gigabit fiber without a problem and also has wifi. But unlike the other two it has no USB port, so you won’t be able to expand the storage, if that is important to you.


  • Right - the water has inertia in a straight line (as does the bucket). When they both try to go straight the string prevents it, accelerating them in a new direction. At each moment you look at the circular path the water’s inertia wants to go in a straight line (tangent to the circle). So at each instant it is behaving exactly as if you had been running in a straight line and stopped.

    What I meant about the geometry and axial tilt - imagine that instead of a bucket you had a dinner plate with a bucket handle. So the water was all at the level of the top of the bucket rim on a plate. As soon as you stopped the plate would flip and the water would splash off. Likewise, if you had the string connected only to the bottom edges of the bucket rather than its handle, as soon as you stopped the bucket would flip due to the water’s strong inertial force against the side of the bucket. The setup doesn’t tilt the bucket in the right way to keep the water contained and impart the new acceleration upon it.


  • Think of the inertia of a bucket of water on a string that you are holding by the string.

    If you are standing still the water and bucket and string behave like you expect.

    Start running suddenly and the bucket will seem to swing back behind you. Your frame of reference is in motion. But when I watch you do this I see a bucket and water at rest. Their inertia resists the sudden acceleration.

    As you pull the string along in your run, the swinging will stop. And with no acceleration (you are in a constant running velocity) the bucket will hang straight down again. The bucket and water are in your moving frame of reference. Their inertia is clear.

    What if you stop?

    Just like when you started running the inertia of the bucket and water will cause them to continue moving, swinging up. Their inertia is linear, but show up as an arc due to the string you’re holding when you accelerate to a stop. The water stays in the bucket because it’s geometry tilts its axis, keeping the bottom pointing in the direction of the watet’s inertia.

    If you were carrying the water on a spoon in the same conditions the water would spill. Because it doesn’t tilt the right way to hold it in.

    If, at that moment of stopping, you started swinging your arm in a circle you could create a circling bucket from your question. Sometimes the bucket will be upside down, but with sufficient acceleration the water will stay in.

    It’s the inertia doing the trick. Aided by the geometry of the bucket.


  • Definitely weird. WiFi connections are poor, but VPN connection over the same WiFi link is good.

    That makes me think perhaps DNS like others have said, or it could be something with your local routing table trying to reach something that’s not reachable. I would probably check the routing table first for anything weird. Like, you might have a static route applied from DHCP, but it’s ignored by your phone OS.

    Since you can reproduce it in the browser I would probably look next at browser dev tools (F12). Go to the network tab. Then reproduce the problem. Once the task properly finishes, hit pause and sort by duration. You can also right click the headers and add a Timings>Latency column. See if there’s anything interesting.

    Like, are the slow steps hitting a new domain name? Is there a slow POST among faster GETs? Is a step repeating after a timeout?

    If nothing’s obvious there I would be tempted to repeat but lower level with wireshark to get the whole network picture. Get a good capture of the problem with a general sense of the timing of the problem pauses (in seconds from the start of capture). Find them in the cap and see what’s what. Compare good vs bad if no clear trends present themselves.




  • Same here. I have 2 other Pi servers and they’ve got no SD card - one has a USB SSD and the other is NVMe on the Pi 5.

    On this one I was only somewhat concerned about SD rot. It was more that on a read/write file system any bad shutdown has a small chance of corrupting something. I wanted it to be bulletproof since it’s got to come up to start the other gear when I’m far from home and unable to fsck and troubleshoot.


  • I use a 3B as a low-power NUT server and power orchestrator with my UPS and a managed PDU. It’s set up with a read-only file system to protect against corruption. It’s connected to the UPS for status so that if power goes down it can manage the power off timing for servers and network gear. I have a low power rack and a long runtime UPS to keep the core Internet access components up as long as possible.

    If the UPS runtime ends the 3B gets a bad shutdown. But with the read only fs it’ll happily boot when power returns and then it brings up all the gear in a controlled way. This has saved me a couple of times already while traveling.



  • Still excludes much of Russia to the Urals (which is in the 3.9M figure).

    But to be clear, I’m not arguing that there’s a view which will make the US map look good by comparison. There are quite a few reasons why the US situation sucks.

    Part of it is how the population is distributed. Here’s a view of population density that helps tell that story:

    Compared with Europe his country has A LOT of empty space. Large tracts of agricultural land and large tracts of marginal to desolate land.

    Add to that the construction and funding of the railroads here. It was all owned by private enterprises focused on freight. If the freight dried up on a route there was no incentive to invest in maintenance. Many railways started fading right around the same time that passenger demand was drying up due to the construction of the interstate highway system and then later due to deregulation of the airlines. Mail started moving by plane and by truck, so that guaranteed income stream dried up too. When the railroads were consolidating and eliminating passenger routes to save money the government formed Amtrak to try and save a few routes. Outside of the northeast it has generally been a curiosity, an experience, more than a competitive transportation option. And most Americans are fine with that. They prefer to roll around in a pickup truck on their own.