So I discovered that the 'ping' latency in Speedtest.net is a lie, at least for DOCSIS cable modems. It says 10ms, but it's closer to 40ms for most people. That's the minimum latency added by cable modem technology.
In the above speed test, I opened Wireshark to capture the session, then looked at the "TCP round-trip time". As you can see, I'm getting around 25ms round-trip. This is DOCSIS 3.1 w/ AQM. DOCIS 3.0 was giving me about 45ms to the same server.
This is a known issue of DOCSIS cable-modem technology, dealing with the fact that multiple customers can't transmit at the same time. When the cable is lightly utilized, it adds 10ms latency. When heavily loaded, it can go up to 100ms.
They are working on a low-latency option for games and voice that need it, but it's still not deployed yet.

The upshot: cable-modems add 10ms to whatever other latency you might have at minimum, and up to 100ms when heavily loaded.
By "I discovered" at the top of the thread, I mean, "I discovered what everyone else who works in that industry already knows", not "I discovered something new that nobody knows". I hadn't been paying attention to this and I should've.
I also discovered that Comcast locks onto the MAC address of your router for 24 hours. So when I got my new modem, I first tested with a USB Ethernet, which was the limiting factor (USB sucks). So I had to retest using Thunderbolt adapter.
But the new Thunderbolt adapter wouldn't work. Testing with masscan spoofing the old MAC address show the problem was their router would only respond to the MAC address of the USB adapter (masscan allows spoofing of MAC addresses).
Changing the Ethernet MAC address on macOS is easy -- if the driver supports it. Unfortunately, this Thunderbolt adapter didn't support it.

But I waited 24 hours for Comcast to forget the old adapter, then the new one worked.

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More from @ErrataRob

28 Apr
Apple created this wonderfuly privacy-protecting contact-tracing app technology. Few (in the U.S.) actually installed it.

Now they want privacy-destroying vaccine passport apps imposed on people to force political correctness rather than health.
Vaccine passports aren't about health, since the almost all the danger the unvaccinated have is toward other unvaccinated people. Thus, requiring vaccine passports to attend a concert is silly.
Vaccines aren't about personal protection or individual incidents of infecting others. Instead, they are about herd immune getting the number of infections down from 50k/day to 1k/day.
Read 9 tweets
28 Apr
People: "You should listen to the CDC on masks"
Also people: <have no clue what the CDC says about masks>

That's demonstrated by the following story which is unaware that CDC has always recommended UNvaccinated people can jog or bike or hang out with household members outside.
Here's a page from March, for example. Outdoor activities like walking, running, and biking are safe for UNvaccinated people as long as you social distance from strangers.
Scroll down on that page and see the unmasked, unvaccinated people jogging and walking their dog.
Read 4 tweets
27 Apr
This thread completely misses the point. That's not the issue.

The issue is that political discussion have become toxic because people cannot tolerate those who disagree with them on important matters.

This thread doesn't answer how they deal with this toxicity.
Sure, you have a channel on #americanpolitics, but how do you handle it when one person claims to shoot guns at the range every weekend, then several others complain to HR how they now feel unsafe at work.
Basecamp's solution to political toxicity was to discourage such discussion at work. Asana doesn't say how they deal with toxicity. Sure, they have spaces for politics, but they still haven't say how you handle it when it bleeds over to work.
world.hey.com/jason/changes-…
Read 5 tweets
26 Apr
Apparently the latest crazy conspiracy theory is that vaccinated individuals can harm the unvaccinated because they cough up evil proteins or something.

No, it's not how things work. The only animals with dangerous proteins are venomous snakes and spiders.
Yes, yes, you can't fully trust what those in power claim about the science, because they twist things.

But you can trust even less what CrazyWombat3993 claimed in that forum post that all your friends are passing around.
Conspiracy theorists are weird. They start using technical terms, correctly, that makes me think "Oh, finally, somebody who understands the science".

Then they veer off into crazy lands demonstrating they don't understand science.
Read 6 tweets
26 Apr
The think I find interesting about conspiracy theorists is how they seem blithely unaware that their talking points have been debunked.

Conspiracy theorists: please please cite the thing that debunks your arguments so I don't have to. You are just being lazy not doing this.
Why do we count the flu by calendar year, but the covid19 since 2019? Because the flu is endemic, happening every year. Outbreaks and pandemics are temporary, so treated as a single event even if it crosses multiple years.
Yes, yes, precise numbers are difficult because sometimes sometimes hospitals are encouraged to count things as covid19 related that may not be. But excess deaths gives us a solid numbers comparable across countries.
Read 9 tweets
25 Apr
Let's talk science, for a moment.

Vaccines are running at 3-million doses per day. Roughly 1/3 of the U.S. population has gotten at least one dose in the last month.

QED: any death that happens has a 33% chance for conspiracy theorists to tie to vaccines.
Science is when you take evidence, create a falsifiable theory, and try to prove the theory wrong.

Conspiracy theories are when you cherry pick things that appear to support your theory, while deliberately ignoring alternative explanations.
Anecdotally, there are a ton of deaths a few days after people get vaccines.

But statistically, the death rate of the recently vaccinated is no higher than people who haven't recently gotten vaccines.
Read 5 tweets

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