Ethernet upload speeds very slow

Currently getting ~ 1mgps upload speed (via 3 different 3rd party testing sites) connected to my ethernet cable. Bypassing my router plugging the same ethernet cable directly into the ONT, I'm getting my expected ~ 850 upload and 850 download. Test the ethernet on a different device and the same issue with slow upload speed.

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Cang_Household

Fifth user in a row. This is probably an Intel Ethernet NIC issue.

Go to your adapter settings and disable IPv6 TCP Checksum Offload. Then test again.

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pacmusicman

There are two Ethernet cables in use...One between the ONT and router & one from the router to the computer. Were both cables replaced?

How is the Wi-Fi working?

Twillz

Thanks for the response!

Wifi is working like normal and getting decent upload and download speeds.

I used the Ethernet cable connecting from my router to my PC to connect straight to the ONT (bypassing the router). Making my speeds 100% back to normal, suggesting that ethernet cable is fine. I have swapped out the ethernet with a new one connecting from the ONT to the router and the problem persisted.

pacmusicman

Let me see if I have a correct picture of the situation. 🙂

Direct connecting the computers to the ONT results in expected speed(s).

When the cabling is normalized, upload speeds are in the mud.

Replacing each Ethernet cable with a known good one doesn't help.

Forgive me if I missed this in the OP.....is there any "inside/in-house" cabling between the router and the computer? 🤔

So, under normal circumstances, this is what would be present:

ONT----(Ethernet patch cable)----router----(Ethernet patch cable)-----8P8C CAT5E/CAT6/CAT6A jack-----in-house cabling-----8P8C CAT5E/CAT6/CAT6A jack-----Ethernet patch cord-----computer.

Cang_Household

Fifth user in a row. This is probably an Intel Ethernet NIC issue.

Go to your adapter settings and disable IPv6 TCP Checksum Offload. Then test again.

quagmire109

Thank you, that actually worked. I had the same issue and the Verizon support did not believe me about "upload" speeds. Not sure why but it started recently after having a hard line to the router for a few years. I even went the route to buy a wireless card for my desktop (motherboard did not have one) and saw the speeds were then normal, as well as buy a new Gigabit PCI-e Network Card to ensure it was not a faulty one on my motherboard either. Prior to your fix, I got the same results with the new network card (Zero upload speed). Wish I would have seen this response earlier. It works perfectly now

Twillz

This did the trick! my upload speeds are much better, around 100mgbps range still quite a bit off from my gigabit internet but it's at least useable now.

dg224

Don’t settle for 1/10 of the speeds you should be getting. I had this issue with my G3100 and now CR1000A. I have no idea why we can’t get back to the full symmetrical wired download and upload speeds of 900 mbps+ that the G1100 had. Surely these new routers have hardware capable of it, right?

Cang_Household

@dg224 wrote:
I have no idea why we can’t get back to the full symmetrical wired download and upload speeds of 900 mbps+ that the G1100 had...

These two customers can't get faster speeds because they are using Intel NICs which have problems with IPv6. They have resolved their issues.

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