domain name system – Use of private and public DNS with DNSSEC

My company, ‘example.com‘, has a public host www.example.com. The (legacy Windows managed) internal network has several internal hosts internalhost1.example.com, internalhost2.example.com and so on.

The internal network has an internal private authoritative DNS server for example.com. The public DNS server is hosted somewhere on the internet. External users on the internet cannot resolve the internal hosts, they are not available on the public DNS server. Internal users can resolve internal hosts because they are using the internal DNS server to resolve.

Now the public DNS is in the process of getting secured by DNSSEC. I have verified that currently the internal clients do not seem to care that the external DNS is secured by DNSSEC, they just continue trusting the internal DNS server, the clients are ‘non-validating’.

Now my question is if there is any plan or roadmap to force all clients to validate DNSSEC? How long will the above setup work if we secure the public DNS with DNSSEC and keep the private DNS non-DNSSEC? A year? Ten years? Forever? Should we convert our internal domain to example.local or can we leave it example.com?

networking – Using Android Phone as Wifi adapter for stereo system?

Would it be possible to use an old Android Phone as a wifi adapter for an old stereo system to stream music to it?

We have an old Stereo System at home (which doesent have wifi conncetion) and I would be a fun idea to use an Android Phone as a wifi Adapter to stream music to the stereo system over wifi…

This is just a fun idea and not that I really need wifi on my stereo system.

Thanks!

halting problem – What is meant by a formal system able to ‘talk about Turing machines’?

I’m reading this popular blog post which describes a proof of Gödel’s theorem from the point of view of computability, using a variation on the halting problem. The original proof of the theorem concerns first-order theories capable of ‘some amount of arithmetic’ (e.g. Robinson). The blog post on the other hand words this as ‘a formal system which is powerful enough to talk about Turing machines’.

What is meant here, by talking about TMs? Is this statement referring (‘in disguise’ I suppose) to using arithmetic on $mathbb{N}$ as described in the original proof, with ‘talking about TMs’ meaning ‘TMs are encoded as natural numbers’ + ‘system manipulates TMs by manipulating natural numbers’ in a suitable way?

It wasn’t clear to me how to establish a clear relation between both formulations, I would be grateful if someone could clear this up!

privacy – Impact of the System Information Leak

Here, The application stored **e.printstacktrace()** in a log file, which is accessible to a specific user group, we need such detailed information for debugging purposes.

As per the security team, they are provoking us to remove such detailed system information from the log file, So here my question is about how it will affect the security of the application.

Thanks in advanced

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recovery mode – My entire Android system has been hacked and reconfigured by my BF how do I rake back control of my device?

Has new certificates, new custom maps api, spies on my activity, will not hard reset, says it is not rooted but really is, turns regular apps into system apps, logsmy activity, will not download most of the time, has files I did not create, using google and android packets, coding etc. PLEASE HELP!!!

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kernel – Troubleshoot 20.04 System Hang Help

So, running ubuntu 20.04.1, up to date as of today, 32 GB ram, system load typically < 1, i9-9900k not overclocked. Twice in the last month, it has hung. By hang, I mean console not responsive, no networking, nothing works, time on display stops, keyboard not functioning, etc. Nothing works, like a crash. But I can find no evidence of a crash, anywhere I should look? The 2 times this has happened, was when machine was idle (no one typing or using it, processes of course running). I have monitorix installed so can see system condition, temps, etc up to the hang time of 16:07. Nothing unusual. Temps at the crash time were around 88F (not C) on each core. System load was just under 1. Used + shared memory was 15G out of the 32G. Acpi temps were 81F reported by the MB, pch was 123F, nvidia RTX2060 temp was 99F. 2 internal HDD were 100F. In short, great shape.

From syslog:

Nov 25 16:05:46 Home-Server systemd(1): Started ZSYS daemon service.
Nov 25 16:05:46 Home-Server zsysd(2442258): sfatula
Nov 25 16:05:46 Home-Server zsysctl(2442251): level=error msg="couldn't save state for user "sfatula": Current machine isn't Zsys, nothing to create"
Nov 25 16:05:46 Home-Server systemd(6470): zsys-user-savestate.service: Main process exited, code=exited, status=1/FAILURE
Nov 25 16:05:46 Home-Server systemd(6470): zsys-user-savestate.service: Failed with result 'exit-code'.
Nov 25 16:05:46 Home-Server systemd(6470): Failed to start Save current user state periodically.
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Nov 25 16:39:01 Home-Server systemd-modules-load(608): Inserted module 'lp'
Nov 25 16:39:01 Home-Server kernel: (    0.000000) microcode: microcode updated early to revision 0xde, date = 2020-05-24

So, time was 16:07 of the freeze as the desktop clock showed this time when I rebooted after trying all sorts of keyboard commands from console, ssh, etc.

Nothing unusual in kern.log:

Nov 25 14:55:19 Home-Server canonical-livepatch(5022): No payload available.
Nov 25 15:44:44 Home-Server canonical-livepatch(5022): Client.Check
Nov 25 15:44:44 Home-Server canonical-livepatch(5022): Checking with livepatch service.
Nov 25 15:44:45 Home-Server canonical-livepatch(5022): Updated last-check.
Nov 25 15:44:45 Home-Server canonical-livepatch(5022): No updates available at this time.
Nov 25 15:44:45 Home-Server canonical-livepatch(5022): No payload available.
Nov 25 16:39:01 Home-Server kernel: (    0.000000) microcode: microcode updated early to revision 0xde, date = 2020-05-24
Nov 25 16:39:01 Home-Server kernel: (    0.000000) Linux version 5.4.0-54-generic (buildd@lcy01-amd64-024) (gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)) #60-Ubuntu SMP Fri Nov 6 10:37:59 UTC 2020 (Ubuntu 5.4.0-54.60-generic 5.4.65)

Poking around in other logs, I don’t see anything helpful. Nothing stuck out to me in the bug database. So, not sure where to turn or look next.

18.04 didn’t ever do this to me. I did not do an upgrade, fresh install as I always do, ~2 months ago or whenever it became available.

Any thoughts, tips, places to look, things to try?