Ethernet connection awful while wifi is on?

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Fiiasco

Commendable
Aug 15, 2016
3
0
1,510
For a while now I've been having consistent internet issues on my PC which is connected directly to our router (AT&T model 5268AC FXN) through an Ethernet cable. My ping spikes to 1000 or higher, down speeds drop below 1mb when they are usually 2-3mb and over all the internet is just garbage. Now, I've done tons of basic trouble shooting and even asked for help on other PC forums and nothing has helped on those ends. However, I have noticed that if I turn off the WiFi completely from the router settings page my internet on my PC goes back to being normal without interruption. Knowing this information I tested that if I turn off every device in my home, it should make my internet fine on my PC. This was not the case, even with all devices besides my PC turned off, the connection on my PC was still awful.
This is where I come to you. How does this make sense? Do you have any ideas to troubleshoot/fix this issue? Thanks in advance.
 
Solution
Ralston18
Wall jacks are notorious for causing problems while appearing "okay".

Inside are wires that are pressed in between little metal teeth (punchdowns) and if not done properly will develop problems such as what you are seeing.

And the issue could be on either end of the fixed cable. Either the punch downs in the wall jack or the punchdowns on the other end which are typically in what is referred to as a patch panel.

Here is sort of a "shotgun" link showing what you may find:

https://www.google.com/search?q=home+network+patch+panels&sa=X&biw=1600&bih=783&tbm=isch&tbo=u&source=univ&ved=0ahUKEwi39cKysMjOAhWKNiYKHcLkD4QQsAQIVQ

There are other such links online with diagrams and photographs. Note: not all are done correctly.

Point being...
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F

Fiiasco

Commendable
Aug 15, 2016
3
0
1,510
Hey Ralston18, I have tried the Windows Network Troubleshooter before and it found no issues, but I ran it again and it said "Troubleshooting couldn't identify the problem." I would switch out the Ethernet cable but I don't have another one long enough and my current cable runs through the wall. I just flushed my DNS as you said, and for the ipconfig here it is:

Windows IP Configuration

Host Name . . . . . . . . . . . . : DESKTOP-KKHSPNR
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : attlocal.net

Ethernet adapter Ethernet:

Connection-specific DNS Suffix . : attlocal.net
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : D4-3D-7E-94-5E-F2
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2602:304:cfec:7140:dc70:a6a:34e9:89aa(Preferred)
Temporary IPv6 Address. . . . . . : 2602:304:cfec:7140:b888:50d7:86fe:5bc6(Preferred)
Link-local IPv6 Address . . . . . : fe80::dc70:a6a:34e9:89aa%3(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.104(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Monday, August 15, 2016 8:23:36 PM
Lease Expires . . . . . . . . . . : Tuesday, August 16, 2016 8:23:38 PM
Default Gateway . . . . . . . . . : fe80::fa18:97ff:fecc:eac5%3
192.168.1.254
DHCP Server . . . . . . . . . . . : 192.168.1.254
DHCPv6 IAID . . . . . . . . . . . : 97795454
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1F-28-1B-AE-D4-3D-7E-94-5E-F2
DNS Servers . . . . . . . . . . . : 2602:304:cfec:7140::1
192.168.1.254
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.attlocal.net:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : attlocal.net
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:5ef5:79fb:49d:22b1:b301:38eb(Preferred)
Link-local IPv6 Address . . . . . : fe80::49d:22b1:b301:38eb%4(Preferred)
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 117440512
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1F-28-1B-AE-D4-3D-7E-94-5E-F2
NetBIOS over Tcpip. . . . . . . . : Disabled
 
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Ralston18

Ralston18

Titan
Moderator
Oct 11, 2014
34,908
3,326
146,290
Not seeing anything per se in the ipconfig results. Maybe someone else will spot something there.

Does AT&T really provide IPv6 connectivity to you? If not I would disable those functions. Or even, if so provided - disable for testing.

Very interested in the cable "through the wall". That introduces any number of possibilities with respect to a cable problem.

Do you have wall jacks? Or is the cable (as I suspect) coming from the router via a long patch cable, through some hole(s), to your computer.

May have been okay at first but now there is some degradation. Check as much of the cable as you can - especially any plugs or punch down connections along the cable path from router to PC. Look for bends, kinks, loose connection, corrosion, rodent chews, and nails/staples damage.

And, if possible, try another computer on that connection instead of your computer. See if the problem disappears, stays the same, or changes in some manner.
 
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F

Fiiasco

Commendable
Aug 15, 2016
3
0
1,510
I just disabled IPv6 connectivity through the LAN settings on my router like you said and I'll give an update if anything seems to change later, however nothing has changed immediately since I disabled it.

Regarding to the wall jack question, I have my Ethernet cable that is hooked up to my PC running through the wall to a wall jack on the other side of the room. I did end up finding another Ethernet cable that was long enough to reach to the jack from my PC so I plugged it in and the internet issues were still going on.

Finally for the different PC connection, I don't have another PC/laptop on hand at the moment but I should be able to borrow one from a friend soon to test the connection.
 
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Ralston18

Ralston18

Titan
Moderator
Oct 11, 2014
34,908
3,326
146,290
Wall jacks are notorious for causing problems while appearing "okay".

Inside are wires that are pressed in between little metal teeth (punchdowns) and if not done properly will develop problems such as what you are seeing.

And the issue could be on either end of the fixed cable. Either the punch downs in the wall jack or the punchdowns on the other end which are typically in what is referred to as a patch panel.

Here is sort of a "shotgun" link showing what you may find:

https://www.google.com/search?q=home+network+patch+panels&sa=X&biw=1600&bih=783&tbm=isch&tbo=u&source=univ&ved=0ahUKEwi39cKysMjOAhWKNiYKHcLkD4QQsAQIVQ

There are other such links online with diagrams and photographs. Note: not all are done correctly.

Point being is that if you look inside the wall jack(s) or at the punched down wires you may find one or more that are not snuggly into place, partially broken, substandard wiring, etc.. The wires do naturally loosen over time but that will happen faster if the initial installation was not done correctly.

For the most part you can look at the internal wall jack connections, reseat any loose wires, and look for other problems if you are comfortable doing so. Otherwise find a knowledgeable friend or family member to help.
 
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