Mysterious ethernet/internet issue

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This is a bit of a long shot, but maybe somebody has seen something like this, I am thinking not but ya never know.

Situation is really weird:

My PC can play World of Warships fine, Company of Heroes via Game Ranger fine.

It can browse/websurf the internet fine.

It can even connect to another laptop over same ethernet port by pulling out internet cable modem cable and reconnecting to laptop etc.

But for whatever reason:

If computers from the outside try to connect to my PC it's not working.

Vice versa it's also not working ?!? Maybe cause those devices are natted.

But as far as I know my PC is not NATTED.

Or it's some strange/new ISP kind of NAT that behaves oddly.

Like only big companies/servers are still reachable and not consumer PCs.

As far as I can tell my PC does have a public IP address.

But apperently this is not working/enough anymore ?! Very strange.

I plan on replacing my PC with a laptop, just as a test, to see if it's the PC at fault and it's software, or if something more strange is going on ?!

What kind of electrical defect/or wear and tear could produce such a weird result ?!

(One thing which is on my mind is something different, a hacked or misconfigured/corrupted modem, which somehow blocks this).

For now I will keep assuming that everything is just fine on my PC and that it's the outside world that simply can't connect to my PC.

Though even laptop <> PC sometimes behaves weird as far as I can recall, but usually I can get it to work (?!) though now I am not so sure anymore.

It's not stupid firewall cause this is turned off and would usually allow anyway... it's something more strange.

I will try to get to the bottom of it though.

Also is there any service out there on the internet where there is a public computer that can send some traffic to a specific tcp or udp port ?!

Just to see if my PC can actually receive this ?!

That would be very helpfull.

Bonus would be if I can then send something back to it's udp or tcp port to see if that computer can also receive from me... and finally it reports this via a website/html or so... or even e-mail or so.

Bye,
  Skybuck.

Re: Mysterious ethernet/internet issue
On Wednesday, October 10, 2018 at 9:39:14 PM UTC-4, snipped-for-privacy@hotmail.com wr
ote:
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this, I am thinking not but ya never know.
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fine.
out internet cable modem cable and reconnecting to laptop etc.
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.
he PC at fault and it's software, or if something more strange is going on  
?!
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d result ?!
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figured/corrupted modem, which somehow blocks this).
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at it's the outside world that simply can't connect to my PC.
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but usually I can get it to work (?!) though now I am not so sure anymore.
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 anyway... it's something more strange.
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ic computer that can send some traffic to a specific tcp or udp port ?!
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to see if that computer can also receive from me... and finally it reports  
this via a website/html or so... or even e-mail or so.
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Local networking with Win2K was not very hard.  Networking with anything ne
wer is a PITA and will work or not work randomly.  I spent a bunch of time  
trying to get two similar PCs sitting next to one another to share files.  
It would work one direction and not the other.  I could remote desktop some
times and other times not.  It never worked reliably.  I could never find a
nyone with info on how to *actually* make it work.  Web sites often just li
ft solutions from one another and sometimes come up with incredibly arcane  
solutions that have potential of doing damage.  

It's a jungle out there.  

Rick C.

Re: Mysterious ethernet/internet issue
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It's worse than all that. I made it work but couldn't begin to tell you how.

...

Re: Mysterious ethernet/internet issue
On Thursday, October 11, 2018 at 2:42:19 AM UTC-4, snipped-for-privacy@gmail.com wrote:
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Yeah, know what you mean.  A long time ago when 8080s roamed the earth a co-worker pointed out that a CPU is a finite state machine with 2^n states where n is the number of bits in the memory.  If you get one bit wrong you then have to find it.  lol  

Rick C.  

Re: Mysterious ethernet/internet issue
On 11/10/2018 12:39 pm, snipped-for-privacy@hotmail.com wrote:
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Lookup 'port forwarding' and/or firewall settings for your gateway/router.

--
Cheers,

Chris.

Re: Mysterious ethernet/internet issue
On 2018-10-10 18:39, snipped-for-privacy@hotmail.com wrote:
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Well don't leave us in suspense. What is it?

Re: Mysterious ethernet/internet issue
On Thursday, October 11, 2018 at 7:09:14 AM UTC+5:30, snipped-for-privacy@hotmail.com wrote:
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What are you using to connect to the INternet - ADSL or cable modem ? In any case, each of  
these devices acts as a router on the LAN side,  
and must have NAT and port forwarding enabled,
and can be configured to block any incoming packets of one's choice. Also all PCs these  
days have a firewall, and the firewall can be configured(on Linux iptables) to allow/block  
any packet of choice. This effectively provides
two layers of protection. Note that NAT and port
forwarding work only at the modem level, not  
on the PC. So aome more details of your setup
is needed before a clearer picture emerges.  
  
  

Re: Mysterious ethernet/internet issue
On Thursday, 11 October 2018 08:08:44 UTC+1, snipped-for-privacy@gmail.com  wrote:

Your service provider may have activated "carrier grade NAT".  This
allows many customers to share the same IPv4 address at the same time.
It makes it completely impossible for incoming traffic to reach your
network, regardless of how you set your router.  The only traffic
that can reach you is replies to your outbound traffic.

Unfortunately, this is becoming much more common.  Ask your service
provider if they are doing this.

Also ask if IPv6 is available.  There are vast numbers of IPv6
addresses available, so CGNAT is not needed.

John


Re: Mysterious ethernet/internet issue
On Thursday, October 11, 2018 at 10:08:07 AM UTC+2, snipped-for-privacy@gmail.com wrote:
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This is my slight fear.

Do you have more information about this ?

Product names ? Protocols involved ? Manuals ? Terminology ?

If I call my ISP and ask the random guy on the phone:


"Are you guys using Carrier-Grade NAT ?"

Then I think he may not known what the hell I am talking about ?

Guy then probably goes to manager and asks what this is.

Another response might be:

"No absolutely not".

So then I need diagnosis tools, and other tools to prove what really is going on here.

Guy might be clueless and give wrong answer or instructed to give wrong answer.

I'm thinking of calling my ISP though, just to see if they can help me in whatever way.

Though I kinda feel I should first do some proper testing myself... then again if it's indeed this kind of NAT I may be wasting my time on unnecessary testing.

I also tried this "first send outbound" data... and then "reconnect to this port".

With some tool.

But perhaps other side was also behind carrier grade NAT so then again it becomes hard to diagnose this.

First I am going to try swapping out my PC for a cheaper/older one... and then re-trying some connect tools so if this does or does not work...

But boring and a hassle to do...

Bye for now,
  Tired slightly bored Skybuck ;) :) none of which is your fault btw lol.

This posting did make me a bit happy of yours, at least there is somebody else on this planet that knows what might be going on ! ;)

Re: Mysterious ethernet/internet issue
On Thu, 11 Oct 2018 04:06:01 -0700, skybuck2000 wrote:

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What is your IP address?  If it starts 192.168.xx.xx then it is using  
NAT, as that is a local-only address.  If is starts out with 10.xx.xx.xx,  
that is also local-only.

Many ordinary, residential ISP services are using NAT, to conserve IPV4  
address space and also save their customers from a big headache.  The  
amount of hacking attempts going on the net are HUGE, so preventing any  
outside access to a user's machine is helpful to the general public, who  
do not WANT their machine to be accessible from the outside.

Jon

Re: Mysterious ethernet/internet issue
On Thursday, 11 October 2018 19:37:59 UTC+1, Jon Elson  wrote:

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CGNAT is a big headache because of the things that it breaks.  Even NAT
in customer routers is bad enough as many implementations are broken in
various ways.  Every residential router has a firewall which should be
perfectly adequate at preventing incoming traffic.

IPv6 solves a lot of problems and it is now available from many service
providers.

John

Re: Mysterious ethernet/internet issue
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A worse problem of CGNAT is that it requires extensive logging of all
network connections to be able to satisfy lawful queries for information,
that normally can be serviced by just logging customer line-level
connections (date/time, customer, IP address).

That logging stores way too much information that could later be abused
for profiling.  It would normally be prohibited to do that, but in the
case of CGNAT it is required.

The provider the original poster uses offers IPv6 in combination with
CGNAT, where other connections without IPv6 get a public IPv4 address.
It is unclear why they used this combination, my provider (in the same
country) offers native IPv6 (/48 for each customer) combined with a
single static IPv4 address (of course usually with NAT in the CPE).

In general, ISPs in this country do not really have the problem of
IPv4 space exhaustion for their resident customers, because they have
grown a lot before this issue really occured and often are formed
from many merged companies that each held plenty of space.  The market
has been saturated for quite some time.

Of course, for mobile users it is different.  Interestingly enough,
not a single ISP offers IPv6 on their mobile networks, they all use
CGNAT (with the possibility to escape it using an alternative APN).

Re: Mysterious ethernet/internet issue
Hmm interesting maybe this can help my PC to communicate with the ISP CGNAT if it's indeed there:

https://tools.ietf.org/html/rfc6887

This wiki mentions it:

https://en.wikipedia.org/wiki/Carrier-grade_NAT

Bye,
  Skybuck.

Re: Mysterious ethernet/internet issue
On Thursday, October 11, 2018 at 9:08:44 AM UTC+2, snipped-for-privacy@gmail.com wrote:
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Cable modem: Ubee evm320b

Setup is as far as I know:


ISP ---- Cable Modem ---- Computer


Nothing else.

But I am starting to wonder if it's:


ISP --- EVIL ISP NAT ---- Cable Modem ---- Computer.



Re: Mysterious ethernet/internet issue
I have an idea, I could try and program a small little php script that sends some udp packets to my computer, maybe later even a full tcp/ip connection.

Not entirely sure if my webhoster allows this but I think so...

Now this my not shed a lot of light if problem is on my side, but it's worth a shot.

Bye,
  Skybuck.

Re: Mysterious ethernet/internet issue
Today I decided to call Ziggo, a company who delivers TV, Internet and Telephony.

I originally called to report a problem with my Analog Television !!!

One of the channels "veronique HD/Disney XD" was displaying snow over the screen.

A cartoon was playing covered in mild snow.

The guy on the phone was very helpfull and very motivated to try and solve my problem to my great surprise ! =D

I did not believe they could solve my problem. I thought they would laugh at me for not using digital television, I thought they might tell me to simply switch to digital television or blame it on me and my TV.

But the exact opposite happened.

First he asked me to check the tv channel, it was on a different number then their TV card but that was ok.

I also reported mild snow on another channel.

Then the guy asked me to check the white cable.

I checked it it was firm... all other TV channels play/display well.

Then he asked me to check the "splitter box" which splits the signal into two or three.

One for television, one for internet, and maybe one for radio or something.

I told him the model is CTU 01.

He asked if I was sure if it was not CTUM. I re-checked and told him:

No it really is a 3 letter thing CTU 01.

Then I had to wait/hold for a moment, after a while he came back.

He told me they were going to send me a new splitter and a new cable to my modem.

This new splitter can be directly connected to the wall socket where the green cable comes in and also a little white box is.

Now before I was going to hang up I told him about my recent internet experiments.

Where I tried to have a computer on the internet connect to my computer. I also told him this failed recently... and I also told him my previous contact with ziggo a while ago could not enter my cable modem menu ?!

To my great surprise he said: "I can access your cable modem just fine" !

I was stunned that this TV guy was also capable of checking internet at the same time LOL.

So this was a double surprise.

But now comes the best part:

The guy says: "I can see errors on the cables, he says, it's the packets".

His speech/accent was sometimes a bit hard to understand but not too bad.

At first I thought he said: "I can see 69 dropped packets".

I asked him what did you say ?

He said:

"In the last 16 days there have been 69 million dropped packets !" =D

I could not believe it. I asked him are you sure these are internet packets and he said yes.

Now I did notice a little bit of internet delays and lags, but this was only during a short period, though yesterday indeed there was also some delay.

So I and him were thinking the same thing. Perhaps this very old splitter has detoriated and it's cable and the noise on the TV is also interferring a little bit with the cable modem now and then.

Strangely enough this NOISE has been on this cable for years and it never really bothered my internet connection.

I can play games just fine... though perhaps this could explain why there might sometimes be a bit of lag in company of heroes, though I kinda think this is other guys.

But maybe it was me alll along ?! That would be funny !

So what is now the most revealing and interesting part of this story, what is the moral of the story ?!:

MY ANALOG TV IS WORTH GOLD !!!!!!!!!!!!!!!!!!!!!!!!!

Cause it can actually DETECT a noisy SIGNAL.

I am not sure if a digital television would have been able to detect it ?!?!?!?!?

So I am now very curious if this will solve all of my weird connection issues.

I am very skeptical, but there is some merit to the story, since the TV signal is indeed snowy on just one channel and slightly a second.

I am very skeptical indeed. But if this is indeed the problem then WOW !!!!!

WHAT

A

STORY  

!!!

=D

Bye,
  Skybuck =D


P.S.: I tried to report this snow sooner via form/e-mail but that didn't work also told this to this guy.

And usually I watch TV late at night beyond 22:00 when their service is not available, working hours and such... so I never really got to it.

But since these problems started occuring I am desperate to solve this connection issue so I am going through all possible causes including a bad TV signal ! HAHAHAHA !

Funny story in a way !

I hope other ZIGGO users and cable modem/tv users/splitter users will learn from this story !

Cause if your TV signal is BAD it may affect your internet as well !

I am not getting my hopes up too much, there may be other problems, but this is indeed very intrigueing ! ;) =D

Small applause for Ziggo for taking this complaint very seriously !

Thank you, time will tell if this actually solves my connection issues and TV signal issues. I will keep you posted on this ! ;) =D

Bye,
  Skybuck.

Re: Mysterious ethernet/internet issue
snipped-for-privacy@hotmail.com wrote in

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  You got screwed.  Digital TV does NOT have "snow".

  You bought downres'd analog broadcast crap?

  Digital content delivery DOES NOT HAVE SNOW.

Re: Mysterious ethernet/internet issue
On Thursday, October 11, 2018 at 3:50:11 PM UTC+2, snipped-for-privacy@decadence.org wrote:
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LOL.

Analog and digital signal is broadcasted over same wire as far as I know.

(It probably needs a second splitter or something or a special box)

I have a Sharp Analog television from 20 or 25 years ago or even more that is working perfectly fine, crispy/colorfull image and zapps real fast, luv it ! =D

Now I luv it even more ! =D

"Noise Detection Device" ! ;) =D

Bye,
  Skybuck.

Re: Mysterious ethernet/internet issue
snipped-for-privacy@hotmail.com wrote in news:518618b2-663d-4993-83ee-
snipped-for-privacy@googlegroups.com:

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  More childish stupid shit from skytard falling.

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  Over here....  over here there is no more analog based TV content.

  You in some ass backwards country, boy?

  I think more likely that you simply just don't know what the fuck you are  
doing, much less what the fuck you are mumbling about off topic in our  
newsgroup, which you invaded years ago with your "I killed my machine"  
stupidity where you blame everyone but yourself for your stupid  
meanderings.  Go away, child.

Re: Mysterious ethernet/internet issue
snipped-for-privacy@hotmail.com wrote in news:518618b2-663d-4993-83ee-
snipped-for-privacy@googlegroups.com:

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  Put an antenna on it tuned to ch6 and you can see when a tornado is  
nearby.

  Other than that...  you ain't real bright.

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