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About MarkJFine
since
10-29-2012
yesterday
MarkJFine
Associate Professor
2996
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1947
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Thursday
One other thing I recently noticed on macOS: There's this process that periodically (and very inefficiently) synchs a lot of data at a 1-2 Mbps rate to your iCloud account. Seems to go on for a very long time, and I've seen it happen twice a day.
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Thursday
iOS and iPadOS updates seem to be monthly. App updates seem to be weekly, minimum.
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2 weeks ago
1 Kudo
Looks like an SSL error, which may mean the DNS cache is corrupted, which happens time to time. Try rebooting the modem to clear the DNS cache. If that doesn't work, it may mean the corrupted DNS entry may have propagated to the device you're trying to reach Podtrac with. In order to fix that, you generally need to refresh your device in a manner that doesn't allow the corrupted entry to re-propagate over the LAN: 1. Turn your device(s) off. 2. Remove from the modem at the wall socket. 3. Wait 60 seconds and re-power the modem. 4. Wait another 60 seconds until the modem has fully rebooted and turn your devices back on.
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2 weeks ago
@maratsade wrote: Enjoy New Jersey! Unfortunately it's not a pleasure trip.
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2 weeks ago
1 Kudo
Needless to say, I get up real early and use Bonus time for all of it. Most of the time it goes pretty fast, at between 25 and 40Mbps. That said, I've been in NJ getting spoiled for the past 2 months. I think Fedora 34 comes out today...
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3 weeks ago
1 Kudo
Good thing you don't develop. Xcode updates every time there's a macOS update, and it's now up to 12GB - and sometimes it fails the first time so it has to be re-downoaded - but that's another story. So there's this machine that would need 18GB, right there, and then another 6GB for my wife's machine = 24GB in one morning, and that's not even a game. I used to be able to capture the maOS updates in the system file structure (before macOS deleted it prior to install), copy it to a USB drive, then install it on my wife's computer. But Apple decided that wasn't safe and prevent you from file operations there anymore.
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3 weeks ago
1 Kudo
I think what he meant was to just post the link to the summary page on TestMy where your results are listed, instead of copying and pasting them in a post here. Part of the issue is it's hard to read, and if the link is posted the admins can see all the tests run, not just the one sample.
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3 weeks ago
1 Kudo
Nothing to fix. The 'limited' thing happens whenever you have anything different from 0% packet loss. In fact a plane going by or a bird circling the area can easily cause 10% packet loss, especially if it's sporadic. You would only see a problem when it goes over 25-30% because of the way redundant forward error checking protocols work. Bottom line: Given the average delay your stats look pretty acceptable. My guess is your speed issue is something else completely, so I would take @maratsade's advice and do some speed tests, if you're not out of data.
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3 weeks ago
2 Kudos
It means the servers that run background applications for everyone are overloaded. Background applications are the things that create data, not necessarily what handles what you see at the user level - those would be front-end servers.
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a month ago
Rebooting resets the DNS cache, which sounds like may have been corrupted on the modem as well as the device having trouble downloading. The DNS information propagates across your entire LAN, but may have not yet corrupted the other devices that are working. In this case, you may want to remove power from the modem, then also reboot the device having trouble. Once the device is up, apply power to the modem again. The reson for this process is to prevent re-corrupting the device in question: The device will wait until the modem is restarted and will get a fresh DNS update once it is. However, if the device is restarted before the modem is turned off, it's just going to pull down the same corrupted DNS information.
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04-13-2021
09:33 PM
Plus, you've run Linux before, so using commands in the terminal window should be second nature on a Mini. Virtually anything you can run in Linux, you can rebuild under Darwin (Mac kernel). You can even have a virtual Xserver running if you download XQuartz. And, if you install Homebrew, you can add all sorts of unix/Linux things that have already been rebuilt for Darwin. A good example is Pan, which has always been my newsreader under Linux, and now under Mac.
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04-06-2021
04:36 PM
2 Kudos
Port 53 is used for DNS and it almost seems as if you are tryng to set up a server that may be accessible from outside your home. If that's the case, please understand that Residential installations cannot be accessed from outside your local LAN because the satellite network is protected behind a double-NAT. Only Business installations may be accessed this way. Disregard if you're merely trying to set something up that's accessed within your local LAN.
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03-29-2021
10:37 AM
1 Kudo
Don't be sorry. Good catch.
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03-22-2021
07:46 AM
1 Kudo
Clearly you haven't read everything, because: 1. Not all people have other options for internet access. 2. Not all people use the internet as a means for watching TV.
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03-21-2021
03:11 PM
The 'signal strength' is really an inverse bit error rate on the data stream, which can vary by humidity. Any kind of water in the air at these frequencies will defract (diffuse?) the signal, making it more error prone, although you might not see those errors due to redundancy and forward error correction protocols. A real dry day (~10-20%) could cause a 'strength' of 125, whereas mild humidity (~40-50%) could drop it a bit lower. Both these instances could be bright, shiny days with no rain at all (which of course, would be above 90% humidity).
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03-19-2021
08:19 AM
2 Kudos
Correct. HughesNet already uses an http (web) accelerator as well as a TCPIP accelerator for other protocols. They are already maximizing as much of the downlink channel as possible. Adding another accelerator on top of that won't be beneficial and may even inhibit the ones already in use.
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03-17-2021
08:24 AM
@Landon_Robinson wrote: That is true that the distance will be further since neither I or the gateway are directly on the equator, I live somewhat north of the "45th Parallel", but still the round trip of 89,000 miles is going to be something around half a second, but going back to what I was talking about before... if I can ping my gateway at 0.4xx ms the problems should not be on my end. A ping is essentially a singular event and measures the round trip access time for that one event. Accessing a web site or streaming server just for one access may be several events, depending upon additional content (images, stylesheets, javascript, etc.) and/or secure authentication processes, which in iteself is a multi-access event due to handshaking. So more complex than a ping, and the latency effects are cumulative.
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03-14-2021
03:48 PM
1 Kudo
Unfortunately speed has very little to do with buffering. Buffering is from latency, congestion, and how streaming servers deal with those factors from satellite internet providers (e.g., not very well)
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03-12-2021
10:23 AM
...or not work at all because of it.
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03-07-2021
10:03 AM
I've noticed this happen when the congestion is extrememly high. I assume what's happening is there is a 'heartbeat' connection to the web acceleration server that just times out. It then assumes it's unreachable and automatically disables it. Sometimes rebooting will get you on a better connection, but as you've seen that is not always the case. When the congestion is that high there's a possibility that you're already on the most reliable channel available.
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02-23-2021
06:48 AM
Not necessarily a HughesNet caching issue (actually I don't think they cache at all), but the latency may be playing a part in the browser recognizing the page had changed. Killing the tab, opening a new one, then loading and optionally shift-refreshing the page should update the browser. Also, if your site is cached if it is behind a Content Delivery Network (CDN) like Cloudflare (more like a large network of caches). You may have to purge everything in the CDN's cache before doing the above. Sometimes I even have to purge when making changes to my .htaccess file, not just pages. I seem to go through this all the time regardless of what network I'm using.
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02-19-2021
08:09 PM
1 Kudo
I'm pretty sure most people don't read these things before posting anything, especially the whingers...
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02-18-2021
09:21 AM
There's at least 5-6" of snow on the ground already in NJ. My wife says just a little sleet in Fauquier.
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02-18-2021
08:48 AM
I understand there's lots of icing in DelMarVa but not a lot of snow. Lots of snow in Central NJ (8A, lol) right now. It's like the tundra up here.
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02-18-2021
08:11 AM
4 Kudos
As everyone knows, Texas is experiencing power outages state-wide due to their extreme weather (I'll try to keep my other opinions to myself for the other reasons). This presents a few problems: 1. If your gateway is in El Paso (ELP), your modem might be operational, but you'll have no connectivity to the internet because there's essentially nothing for your modem to connect to in order to get to the internet. Nothing really can be done until power is restored to El Paso, and that may be limited if the site is subjected to rolling blackouts. 2. The internet provider of other gateways will have to dynamically re-route around places in Texas where there's no power. Again, if those sites are experiencing rolling power outages it may be hit and miss, and hopefully VERY dynamic. 3. If the site you're trying reach is IN Texas, well... it goes without saying that will be hit and miss as well. Keep in mind this severe weather is now moving Eastward, so both 2 and 3 above may not be limited to just Texas for the next few days.
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02-18-2021
07:59 AM
@maratsade wrote: Looks like your gateway is in El Paso, TX. Right now they're having a huge issue with their grid, plus serious weather issues, and these two things might be what's affecting your equipment. Several web sites are down because no power in TX as well.
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02-14-2021
02:06 PM
2 Kudos
When it's fixed, you should be able to block by the domain name, e.g. *@zedline.com. That should stop it for a week until the domain changes. Admins may want to relay this to the engineers: Majority of spam will come from web servers that have been compromized by hacked web site plugins as a means to get around checks to the RBL, but it doesn't last long. That said, it's best for the email server to check the HELO IP of incoming messages against an RBL and reject as appropriate. It's one of the best defenses to kill this beast. The current checker they have in place doesn't seem to be doing this.
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02-13-2021
07:19 PM
I'm having a blast with these things. It's really gotten me back into radio. I mainly use the RTL-SDR for experimenting with HD Radio (nrsc5, nrsc5-gui on github) and a trunk tracker called SDRTrunk (also on github). All my DXing is done on the AirSpy HF+ Discovery using Gqrx and a thing called SdrDx. The AirSpy is a lot better with sensitivity and dynamic range/image rejection than the RTL-SDR, especially on HF. The RTL-SDR runs a little hot too, so it may be very possible that it has a bad solder joint somewhere. Edit: Forgot to add that on HF the AirSpy does especially well with digital signals. I can output a DRM signal through a virtual audio cable and decode it using Dream, or do something similar using SDR# in a Windows VM and pipe the audio into MultiPSK. Working more signals than I ever did with my NRD-535D!
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02-13-2021
11:42 AM
The DNS server wouldn't account for the DNS cache inside the modem getting corrupted. In fact, the DNS cache getting corrupted is likely more an indirect result of many DNS queries during a lengthy ping gap. As far as what's causing the gap, it could be anything from a bad Operating System upgrade, to some hardware inadvertently tying up processing. Something I've even seen lately while using an RTL-SDR is that they can wreak havok if the USB connection is disturbed, almost to the point of causing cyclic kernel panics on my Mac. As an aside, my AirSpy HF+ is a much better device for HF and limited VHF (and isn't as finicky), but the RTL-SDR goes DC-daylight and is best for monitoring trunked comms.
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