tychosmoose

I was going to recommend a couple of Mikrotik 5Ghz bridge devices, but for the same money this would probably be easier to set up.

I don’t understand why Mikrotik doesn’t make a 5Ghz Wireless Wire kit. Their 60Ghz WW is great, and already paired like this TP-Link kit. But 60Ghz is so sensitive to line of sight interference.

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.

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.

That 3.9M figure includes European Russia and the Nordic countries, which are largely excluded from the map image to make the difference more glaring. Not as much rail connectivity in the north. But even with that, Europe is twice as densely populated as the USA. If you look only at the EU, it is 3x as densely populated.

It’s not the only reason for the difference, but it’s a big one.

Not sure if they’re still in production. There was also an Italian company selling one (maybe based on the same hardware).

Like u/floquant I would look at Mikrotik. But you’ll need to pay attention to port speed (they still sell 100Mbps gear) and their tested routing throughput numbers to be sure they can hit the numbers you need.

Not quite what you’re seeking, but maybe relevant.

Have you considered an SFP modem like the Proscend 180T? Might be hard to source these days, but if you have a router with an SFP cage this would be a way to accomplish the single box goal.

This flag seems to only disable ipv6 on the default Docker bridge network, not daemon-wide. At least per this discussion.

It’s in the dnsutils package.

Well crap. Do you have no ipv6 address now in ip addr?

Guess I gave Docker too much benefit of the doubt and assumed it should failover to v4 once v6 was disabled. Bad assumption on my part.

Could it be a DNS problem? If you dig registry-1.docker.io +short does it return an ipv4 or v6 address?

It looks like there have been sporadic reports of problems from people since last year.

Ok, so it’s probably using NetworkManager. I would try disabling it in /etc/NetworkManager/NetworkManager.conf by adding a block like:

[ipv6]
addr-gen-mode=stable-privacy
method=disabled

Then sudo systemctl restart NetworkManager. Can’t say for sure if this will work. I dislike using NetworkManager on my servers so I can’t test if this works. But hopefully the before/after of ip addr is different.

Although it looks like your ip addr output posted an hour or so ago doesn’t show any ipv6 addressing. Maybe the problem is solved now.

Different programs have different defaults.

But in your situation which would be more helpful - prevent this one docker command from using ipv6 (likely more difficult), or preventing all commands from using your broken ipv6 config (likely easier)?

I have no idea about the first. Maybe some people know this detail. But I’m sure that with a distro and version that you’re running, there are lots of people who could help with the second. Raspberry Pi 3B+ is the hardware. What software are you using?

Docker is a distraction in your problem description.

It’s like if you asked why the top gear in your car isn’t working and gave the model of car and engine type and gearbox. But it’s really that you’re stuck in slow traffic. Focus on the road name and destination to find a faster route.

For your problem, search for how to disable ipv6 for the Linux distribution and version that you have installed. You will find lots of guidance. Or share those details here for someone to help.

Or, better might be to see if there is a way to get ipv6 tunneling working on your connection. It may be possible even if the ISP is unhelpful.

Some routers advertise a routable link local.

Being on-call at any hour is something to consider. With a large enough organization it can reduce the frequency, but it never goes away.

Also, maintenance is scheduled for critical systems at low demand times. It’s another reason to be prepared to work nights.

https://feddit.dk/comment/15559453 ?

Correct. And as AtariDump points out, it’s best to check typical runtime wattage, not peak, and not just on specs.

After you know the wattage of your load, use the Runtime tab on the product page to see how much runtime you get at a given wattage. https://www.cyberpowersystems.com/product/ups/smart-app-lcd/or1500lcdrm1u/
The one you have selected will have 2 minutes of runtime ~900w on a fresh battery. If all you want to do is clean shutdown, that’s probably fine (as long as you don’t have brief power drops that you want your shutdown procedure to ignore). If you need more time then you’ll need a different UPS.

Note that some UPS models will do better for a given task than others with similar specs. For example I have a ~100w homelab, and wanted maximum runtime for 50w during a power outage (servers off, router+switch+aps active). Some similar spec Cyberpower models were ~120 minute runtime at 50w while others were 200+ for the same load.

This appears to be a 14500 lithium ion cell (same physical size as AA), putting out 3.7v for a device like this flashlight that supports it. No voltage step down, just charging circuitry on-board.