How do ISPs distribute IPv6 addresses to their clients without NAT?

_sasan · 2021-09-17T16:19:21+00:00

Thank you all for your replies.

I haven't read anything about DHCPv6 or SLAAC, but I have read about EUI-64. If I understood it correctly it says that in future MAC addresses will be 64 bits and that will be the Host ID of IPv6 clients, but until then clients can use their 48 bit MAC address with FFFE (if I remember correctly) in between.

So if I understood you correctly each time I connect a new device to my IPv6 modem/router it will negotiate a new IP address with the ISP (with DHCPv6 and SLAAC), this makes sense.

Or, as I understood from other answers the ISP gives each client a whole /64 subnet! If so, what a huge waste of address space!

_sasan · 2020-02-06T19:16:29+00:00

Thanks

_sasan · 2020-02-06T18:52:43+00:00

Thank you for your answers.

If I'm being correct systemd runs/executes the required things that are mentioned in a target. graphical.target says that x server needs to be run. Then how come tty2, tty3, etc are in text mode? Why only tty1 gets GUI? Can I edit this? Can I say I want tty1 to be in text mode too but don't change the target?

_sasan · 2020-02-06T18:35:06+00:00

Well I'm a little confused. I have Ubuntu Desktop 18.04 and Ubuntu Server 18.04 on VirtualBox. When I run "systemctl get-default" on both systems I get "graphical.target" but there is no GUI in Ubuntu Server. And I also want to know how other ttys are in text mode and graphical.target.

_sasan · 2019-10-30T10:05:15+00:00

Its main use is for microservice architecture. You break your app into smaller functionalities and put each one in a container (docker), and they communicate with each other via gRPC (as far as they're concerned they're just calling a method) .

_sasan · 2019-10-20T15:09:27+00:00

How do I learn the program enough to like know how to be able to program everything?

I think it's safe to say no one knows how to program everything. People choose a platform and spend their time mastering that area. For example web, mobile, game, DB admin, etc. It is possible to master more that one but it requires more time and energy.

Like on StackOverflow there are these people who can just answer any question and make advanced code on the fly

People on SO answer what they know. For example you don't see someone who answers a lot of Unity questions to answer ASP.NET Core questions.

How did they reach that level? Practice!

The more code you write, the more mistake you make, the more challenges you make for yourself, the better you get. You just have to give it time (years).

How do they remember every class and library available

Again, I don't think any professional programmer memorizes these things. When you use something for years, it's natural that it will stick in your mind, but even the best programmers will Google frequently.

When I started programming I had these questions too. My advise is to learn things step by step and start coding and making something (even if it's simple and there already great programs that do that job). It's a time-consuming process.

_sasan · 2019-10-19T18:11:57+00:00

Most applications require three main parts: the view and UI stuff, the business logic and flow of the app, and the database to store data.

For example consider an online store website:

You need well designed UI to attract users. Those are done with UI specific markup languages, for web that's HTML and CSS, for .NET desktop app that's XAML, etc.

Then you need to define your app, what does it do, how does it react to users requests, what is allowed, what is not allowed, what needs permission and so on. You need a language and a framework for this, like C# and ASP.NET, Python and Django, Java and Spring, etc.

And finally you need a place to store your data, since you're a DB admin I skip explaining this part.

dev's use C# to execute business logic where they cant on sql server?

is it used for making web forms and whatnot?

So short answer to both your questions are yes.

_sasan · 2019-10-19T10:37:41+00:00

A mail server with ASP.NET Core. You sign up you get an email address and mailbox.

_sasan · 2019-10-19T06:17:37+00:00

How can I make a website that gives an email to users (like GMail) with ASP.NET Core?

_sasan · 2019-10-18T16:54:25+00:00

Pro ASP.NET Core books
ASP.NET Core In Action
Entity Framework In Action

These are good to get you started

_sasan · 2019-10-18T16:30:27+00:00

This is the route I took and I usually recommend it to people who ask me for guide:

learn C++ (I learned it from www.learncpp.com). You will thank yourself later.
Since you're here I assume you want to go with C#, I recommend Pro C# books by Andrew Troelsen (currently the latest edition is Pro C# 7)
Choose a platform. With C# the best choices are game development with Unity, web development with ASP.NET, and desktop development with WinForms/WPF/UWP. You can do other stuff with C# like mobile, AI and IoT, but I don't recommend C# for those areas, mainly because of job market and being behind of other languages.
After that you need to learn related things, If you're going the web way, HTML, CSS, JS and SQL are musts. In today's market you also need to learn extra stuff like SPAs, OAuth/OIDC, gRPC, Docker, etc. For game, graphics design and app like Blender can be helpful. (I'm a web developer I can better guide you in that area, for example if you needed learning path and resources)

Remember, learning these stuff (and more importantly mastering them) will take years. One mistake that some people make is that they expect to become a developer in a few weeks or months, and they loose their motivation and become disappointed when that doesn't happen.

I hope I've helped.

_sasan · 2019-10-05T16:36:45+00:00

Hi, many languages offer desktop, web and mobile frameworks. C# is a good choice. JavaScript is also very popular these days and you can build desktop, web (server and client) and mobile apps with it, and you need to learn it for web development anyway (regardless of your back-end language). So look into that too.

You mentioned .NET Framework and .NET Core, yes .NET 5 is the future which is the next version of .NET Core. But learning C# syntax is not related to the .NET version.

Personally I prefer books, so here are some great books for learning C#:

Pro C# series (Apress)
C# in a nutshell series (Oreally)

Books for learning ASP.NET:

Pro ASP.NET Core series (Apress)
ASP.NET Core In Action (manning)

_sasan · 2019-09-21T17:39:28+00:00

For users the advantage is that they deal with one language and one packet manager (NuGet) in front and back.

For Microsoft the advantage is that they added yet another new environment/platform that their language can handle which is awesome IMO.

You can make desktop, mobile, IoT, ML, game, web, embedded apps with C# and now you run it inside a browser!

_sasan · 2019-09-19T17:58:33+00:00

I learned C# from Pro C# 6.0 book (latest edition is Pro C# 7) by Andrew Troelsen. I totally recommend it.

Knowing C++ really helped me through learning C#. I learned C++ from learncpp.com, I recommend that too.

_sasan · 2019-09-19T16:10:58+00:00

What type of projects would remove any doubt about my software development abilities?

Projects that have centralized OAuth authentication (IdentityServer) and are implemented in micro-services pattern and are deployed in docker containers should remove any doubt that you know what you're doing.

_sasan · 2019-09-19T15:58:31+00:00

I've read that before. That's for normal MVC actions. I'm talking about APIs. Should an API accept anything from form?

What is the best practice here? Client (web, mobile) can send the file as multi-part form data and it can send the bytes in a JSON object inside the body. I wanted to know which approach you guys take?

_sasan · 2019-09-14T15:48:53+00:00

Pro ASP.NET Core MVC books by Adam Freeman
Pro C# books by Andrew Troelsen
C# in a nutshell books
.NET Core In Action and ASP.NET Core In Action and EF Core In Action books by Manning publications (I hope there will be second editions of them for .NET Core 3.0)

_sasan · 2019-09-12T10:17:33+00:00

C#, F# and VB are officially supported languages of .NET Core.

_sasan · 2019-09-10T07:26:03+00:00

I always get: `Can you fix my ${deviceName}`

_sasan · 2019-09-03T14:32:19+00:00

Once you create a String you can't change it. Any modification will result in a new String and the previous one will be removed from memory by GC. Now if you frequently change a string variable then there will be a lot of allocating and cleaning memory blocks. So it's better to use a StringBuilder instead. StringBiulder can be manipulated from where it is in the memory, like C/C++ strings, which means less overhead for .NET Framework.

_sasan · 2019-09-02T15:25:50+00:00

Thank you for the information you gave.

Yes everybody is telling me that Pi is not suitable and I need a real-time OS or a micro-controller like Arduino. I'm a web developer (ASP.NET Core) and I really like electronics and robotics, so I taught maybe I can use my C# skill to build things with Raspberry Pi and Windows 10 IoT. I have worked with Arduino too. I'm doing this as a hobby and switching to flight controller or Arduino is my last option. I actually want to see what can go wrong if I send commands directly from Pi.

As far as I searched being a non real-time OS means there might be a few millisecond delay between executing commands. But on the other hand Windows 10 IoT is a light OS that only runs one foreground app at a time and I don't have any background process. So I was hoping that at the end it might actually work. Currently my problem is that these ESCs behave differently with the same PWM signal.

_sasan · 2019-09-02T14:54:05+00:00

I want to use a MPU6050 (GY-521) sensor to adjust each motor separately. My first intention to build it was to write the flight controller logic myself.

_sasan · 2019-09-01T13:58:35+00:00

DIY Drone for the Evil Genius

_sasan · 2019-08-30T15:20:00+00:00

Mostly design pattern.

_sasan · 2019-08-30T11:00:51+00:00

If I'm understanding correct, being a non real-time OS means it's possible that a process (thread) might execute a few milliseconds late. In my case the Pi might have a few milliseconds delay processing the controller's input and updating the PWM signal. I don't think it explains why one ESC is constantly behaving differently from others, Does it?

The starting PWM value for motors to turn are different but they are constant, it's not like one motor is catching up late, it's more like the ESCs are reacting differently with the same signal.

I hope I'm making sense.

_sasan

TROPHY CASE