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No Internet Connection

ShadowWolf211

Hey guys,

I am having trouble getting connected to the internet on my computer, I just recently switched to Xfinity on Saturday and was having no issue with the service and I woke up yesterday and have been getting an error that no Ethernet is connected when one definitely is. I did verify that there is no issue with the Ethernet cord as I tried the modem on my laptop and it was able to connect to the internet, and the port on my motherboard is working as well because I still have my ATT service up and running and that modem will provide internet to my desktop as well. I am unable to do ipconfig /release or /renew because it shows media disconnected, I have tried doing ipconfig /flushdns, I have tried netsh interface ip reset log.txt, 

netsh interface ip delete arpcache, I have tried power cycling the modem, I have uninstalled and reinstalled my network drivers and nothing seems to be working. To provide some more information the modem I have is an Arris Surfboard SB6183, I am running on windows 10 I just upgraded to 1809 yesterday hoping that may fix it but the problem started on 1803, I have a Gigabyte Z270 Gaming K3 motherboard and the Ethernet port is the Killer E2500 and the last thing which I am assuming is possibly the issue but I do not know how to fix it is the DNS connection suffix is showing at attlocal.net even when I have my Xfinity modem plugged in. Any help or suggestions would be appreciated I am currently at work so I would be unable to provide any screen shots until later tonight but am willing to try and suggestions provided as well.

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Well, try to release the IP in the network settings window.

I'm gonna go find my own tech support...

with BLACKJACK and HOOKERS!

(Welcome to LTT Forums)

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Right click the network icon, hit network properties, click adaptor settings, then right click your ethernet connection and look at the proporties and stuff.

I'm gonna go find my own tech support...

with BLACKJACK and HOOKERS!

(Welcome to LTT Forums)

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Considering the level of troubleshooting you've conducted thus far I would be curious to see if the issue on the Windows end or the Network.

 

This isn't a definitive test. The issue could still be network related it just makes it a lot less likely is if you make a bootable thumb drive with Linux and got into the OS. If you can get online just fine then we can say the issue is almost definitely Windows OS related.

 

If it cannot connect it confirms something is wrong on the hardware or network end.

 

You could also try running ping 127.0.0.1 or ping localhost to check if TCP/IP is working.

 

Did you try going into Network Adapter settings and see if the interface is enabled? Is DHCP set for both getting an IP & DNS? (Unless you're using a DNS of your own choosing). Did you try putting in parameters manually? This may show your computer is having problems with DHCP.

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17 minutes ago, LukeTheCoder05 said:

Right click the network icon, hit network properties, click adaptor settings, then right click your ethernet connection and look at the proporties and stuff.

What property or setting specifically should I be looking for that would release it because I was messing around in there yesterday as well, I tried changing the speed & duplex which didn't work and am unsure where to look in the newtork settings.

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4 minutes ago, Windows7ge said:

Considering the level of troubleshooting you've conducted thus far I would be curious to see if the issue on the Windows end or the Network.

 

This isn't a definitive test. The issue could still be network related it just makes it a lot less likely is if you make a bootable thumb drive with Linux and got into the OS. If you can get online just fine then we can say the issue is almost definitely Windows OS related.

 

If it cannot connect it confirms something is wrong on the hardware or network end.

 

You could also try running ping 127.0.0.1 or ping localhost to check if TCP/IP is working.

 

Did you try going into Network Adapter settings and see if the interface is enabled? Is DHCP set for both getting an IP & DNS? (Unless you're using a DNS of you're choosing). Did you try putting in parameters manually? This may show your computer is having problems with DHCP.

I believe it is set up to get both automatically, I will try the ping test when I get home as well and I did not really mess around too much with the DNS settings I did try a few but to no success. 

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1 minute ago, ShadowWolf211 said:

 

What property or setting specifically should I be looking for that would release it because I was messing around in there yesterday as well, I tried changing the speed & duplex which didn't work and am unsure where to look in the newtork settings.

try to disable auto ipconfig and type one of your own.

I'm gonna go find my own tech support...

with BLACKJACK and HOOKERS!

(Welcome to LTT Forums)

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3 minutes ago, LukeTheCoder05 said:

try to disable auto ipconfig and type one of your own.

Do you have any suggested IP address or DNS settings I should put in, if not I am sure I can probably google and find something just curious.

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2 minutes ago, ShadowWolf211 said:

Do you have any suggested IP address or DNS settings I should put in, if not I am sure I can probably google and find something just curious.

Usually the private address range that's pre-configured in your router is either the 192.168.0.0/24 or 192.168.1.0/24 network. If you happen to be in a network with a double NAT it's often the latter. You'll have to check your router then pick any IP within the range that isn't currently being used. (Not a permanent solution)

 

Your DNS will vary dependent on your ISP but if you want some public DNS servers for testing purposes you could use Cloudflare's 1.1.1.1 (Primary), 1.0.0.1 (Secondary)

Google's 8.8.8.8 (Primary, 8.8.4.4 (Secondary)

There's some others I can't remember but other people can fill those in. If I recall correctly if there's no successful connection to DNS your computer will tell you there's no internet connection. 

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8 minutes ago, Windows7ge said:

Usually the private address range that's pre-configured in your router is either the 192.168.0.0/24 or 192.168.1.0/24 network. If you happen to be in a network with a double NAT it's often the latter. You'll have to check your router then pick any IP within the range that isn't currently being used. (Not a permanent solution)

 

Your DNS will vary dependent on your ISP but if you want some public DNS servers for testing purposes you could use Cloudflare's 1.1.1.1 (Primary), 1.0.0.1 (Secondary)

Google's 8.8.8.8 (Primary, 8.8.4.4 (Secondary)

There's some others I can't remember but other people can fill those in. If I recall correctly if there's no successful connection to DNS your computer will tell you there's no internet connection. 

Awesome thank you, I will try your guys suggestions once I get home and report back with an update hopefully a good one fingers crossed.

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9 hours ago, Windows7ge said:

Considering the level of troubleshooting you've conducted thus far I would be curious to see if the issue on the Windows end or the Network.

 

This isn't a definitive test. The issue could still be network related it just makes it a lot less likely is if you make a bootable thumb drive with Linux and got into the OS. If you can get online just fine then we can say the issue is almost definitely Windows OS related.

 

If it cannot connect it confirms something is wrong on the hardware or network end.

 

You could also try running ping 127.0.0.1 or ping localhost to check if TCP/IP is working.

 

Did you try going into Network Adapter settings and see if the interface is enabled? Is DHCP set for both getting an IP & DNS? (Unless you're using a DNS of your own choosing). Did you try putting in parameters manually? This may show your computer is having problems with DHCP.

Update I tried pinging 127.0.0.1 it showed 4 packets sent and 4 received, I tried to also set my own ip and dns I used 192.168.1.2 and i set the DNS as 1.1.1.1 and 1.0.0.1 and it is still showing as no ethernet connected.

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1 minute ago, ShadowWolf211 said:

Update I tried pinging 127.0.0.1 it showed 4 packets sent and 4 received, I tried to also set my own ip and dns I used 192.168.1.2 and i set the DNS as 1.1.1.1 and 1.0.0.1 and it is still showing as no ethernet connected.

Are you sure no other device is using .2? Duplicate addresses will cause network related errors.

Can you ping the default gateway? If you're on the 192.168.1.0/24 network it should be 192.168.1.1

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7 minutes ago, Windows7ge said:

Are you sure no other device is using .2? Duplicate addresses will cause network related errors.

Can you ping the default gateway? If you're on the 192.168.1.0/24 network it should be 192.168.1.1

No other device is set to the network but I did try 192.168.1.1 as well and that did not work, I did also ping localhost which comes up as hsd1.fl.comcast.net and shows reply from ::1: time<1 for all 4 and shows 4 packets sent and received. I did also try pinging the modem itself which would be 192.168.100.1 for that not sure if I needed to do that as well and that one failed.

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3 minutes ago, ShadowWolf211 said:

No other device is set to the network but I did try 192.168.1.1 as well and that did not work, I did also ping localhost which comes up as hsd1.fl.comcast.net and shows reply from ::1: time<1 for all 4 and shows 4 packets sent and received. I did also try pinging the modem itself which would be 192.168.100.1 for that not sure if I needed to do that as well and that one failed.

.1 is usually taken by the router automatically. You can't use it. You said 100.0 that's a different network than my assumptions. What IP network do all your devices connect under? What addresses get handed out normally?

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1 minute ago, Windows7ge said:

.1 is usually taken by the router automatically. You can't use it. You said 100.0 that's a different network than my assumptions. What IP network do all your devices connect under? What addresses get handed out normally?

I'm currently not using a router just the modem at the moment but let me try plugging the modem into my laptop and see what ip address is assigned.

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This is currently what I see when I run ip config on my laptop plugged into my Arris SB6183

\\

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You need to delete that picture I can't verify but that might be your public IP. Delete it.

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Is there a reason it would be coming up as that instead of a standard IP and could that be any reason I am getting the no ethernet connected issue?

I also checked the logs in my modem and noticed that  this is listed

Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=78:96:84:e7:2d:20;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out
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Just now, ShadowWolf211 said:

Is there a reason it would be coming up as that instead of a standard IP and could that be any reason I am getting the no ethernet connected issue?

I think I might know what's going on. Let me ask, what is the model number of the modem?

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It's an Arris Surfboard SB6183

1 minute ago, Windows7ge said:

I think I might know what's going on. Let me ask, what is the model number of the modem?

 

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1 minute ago, ShadowWolf211 said:

It's an Arris Surfboard SB6183

 

On a computer that connects fine can you open a browser and go to 192.168.100.1?

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1 minute ago, Windows7ge said:

On a computer that connects fine can you open a browser and go to 192.168.100.1?

Yes I am able to go to that ip and it brings up the gui for the modem.

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1 minute ago, ShadowWolf211 said:

Yes I am able to go to that ip and it brings up the gui for the modem.

If going there worked I wonder why ipconfig showed you public addresses in the Address & Default Gateway. Are you connected to a mobile hotspot?

 

You did ipconfig on this laptop I'm assuming correct? Don't post a screenshot this time but run ipconfig and tell me if the physical network adapter says:

Default Gateway: 192.168.100.1

Then your IPv4 Address being between .2 & .254

 

If you get the same addresses as in the picture you showed just say yes or no.

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1 minute ago, Windows7ge said:

If going there worked I wonder why ipconfig showed you public addresses in the Address & Default Gateway. Are you connected to a mobile hotspot?

 

You did ipconfig on this laptop I'm assuming correct? Don't post a screenshot this time but run ipconfig and tell me if the physical network adapter says:

Default Gateway: 192.168.100.1

Then your IPv4 Address being between .2 & .254

 

If you get the same addresses as in the picture you showed just say yes or no.

I am not connected to a hotspot I made sure I have the wifi turned off on the laptop so it doesn't interfere and I ran it again and got the same as the picture

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