Ethernet not working, WiFi works
mougu
Enthusiast - Level 2

I have Gigabit Fios and my ethernet seems to work selectively. It works perfectly for most web services, but is extremely slow on a few of the sites that I frequent (Youtube, Netflix, and Gmail). When I switch my computer over to WiFi instead of ethernet, the problematic sites work normally. 

Other people on my network who are also on ethernet have no problems on their end. This makes me think that this is an issue with some network setting on my device. I have already reset my network settings and the issue persists. I am hoping someone here has some insight into what the cause of the problem could be and how to solve it.

I should also note that this is a recent issue that started happening about a week ago. I've had the same service since October of last year and my ethernet has had no trouble until now. There was Verizon outtage in my area about a month ago and after that is when I started to notice this problem. I am unsure if that outtage is the cause, but it was an interesting coincidence...

0 Likes
Reply
1 Solution
Cang_Household
Community Leader
Community Leader

No. VZ rolled out the long awaited IPv6 for selective customers recently. Some devices and adapters does not work with IPv6 (despite being a standard since 1999) or did not implement it correctly without knowing until now (because nobody bothered to test it).

View solution in original post

12 Replies
Cang_Household
Community Leader
Community Leader

Do you have a WAN IPv6 address? If so, do wired devices have Intel network cards? If so, you need to configure special settings on Intel NIC because they have bugs.

mougu
Enthusiast - Level 2

Running ipconfig shows that I have an IPv6 address, a temporary IPv6 address, and a link-local IPv6 address.

My computer does have an intel network card. The model is Intel Ethernet connection i219-V. What settings should I configure my network card with?

0 Likes
Reply
mougu
Enthusiast - Level 2

I have disabled TCP IPv6 Check sum and the issue still persists.

0 Likes
Reply
Cang_Household
Community Leader
Community Leader

Do you have switches in between the computer and the router? If the switch also uses the Intel chip, you need to disable them all along the network path.

mougu
Enthusiast - Level 2

The network switch that I am using is a Linksys SD2005. I believe this does use an intel chipset. With my current physical setup, it is not possible for me to bypass the network switch and plug my computer directly into the router.....

This is the same network switch that I have been using since October of last year, and my ethernet was working fine up until a week ago. Shouldn't that eliminate the network switch as part of the problem?

0 Likes
Reply
Cang_Household
Community Leader
Community Leader

No. VZ rolled out the long awaited IPv6 for selective customers recently. Some devices and adapters does not work with IPv6 (despite being a standard since 1999) or did not implement it correctly without knowing until now (because nobody bothered to test it).

jcettison
Newbie

 I was having intermittent internet connection problems. The internet worked, but then it didn't. Most sites loaded, but some didn't. Pages would freeze, or stall, or require multiple refreshes to go through. 

Found this post, disabled IPv6 outright via my Verizon router's firmware admin page and suddenly everything is working right as rain again. Seems like the IPv6 rollout was the culprit, at least so far. Will update if needed. 

0 Likes
Reply
Mystifieduser
Newbie

I spent over 10 hours on the phone with Fios tech support trying to fix this problem, and they wanted to blame everything except what their network guys did during the outage.  They were willing to swap out my perfectly fine router for another, but not to escalate the problem to anyone senior.  The consistent thread on all of the reported problems of wonky Ethernet behavior on this site was that it happened after an extended local internet outage.  You know that Verizon senior tech management knew why they had that long outage, if indeed it was to upgrade their infrastructure to support ipV6.  Why didn't they tell anyone?

Finally, the suggestion to just go into the router settings and turn off ipV6 also fixed my problem.  Why doesn't anyone in Fios customer support know about this?  Why won't they escalate issues to the technicians who were the ones who broke likely tens of thousands of user's connections?  I find this so irresponsible of Verizon that I'm tempted to vote with my feet and switch back to Optimum who has upgraded their infrastructure, but they were so wretched during the pandemic when everybody was trying to work for home I'm not sure I'm ready to forgive them yet.

0 Likes
Reply
Cang_Household
Community Leader
Community Leader

How many times do I need to make this clear?

If turning off IPv6 fixes your issue, it points squarely to the NICs on your computer. They are defective and you need to replace them as soon as possible. If NIC is attached to the motherboard, you need to replace the defective motherboard altogether.

Didn't have issues before doesn't mean the issue is not on your side. Verizon ensures everything until their router is good. You need to fix the hardware on your computer.

Cang_Household
Community Leader
Community Leader

Disabling IPv6 cuts you off from IPv6 part of the Internet.

If this is not clear, let me repeat: IPv6 isn't the culprit, faulty networking hardware is. As Intel noted back in 2017, virtually all 1G and 10G Intel NICs have compatibility problems with IPv6. The only solid solution is to replace all Intel NICs and/or motherboards containing those NICs as soon as possible.

mougu
Enthusiast - Level 2

Gotcha. I will see if I can find a way to connect my computer directly to the router and see if that fixes the issue.