Very slow Fios upload speeds via Ethernet
tal_145
Enthusiast - Level 1

Situation:  Dell PC running Windows 10 connected via Ethernet cable to Fios G1100 router.  Download speeds are fine (~100 Mbps), but upload speeds are limited to < 1 Mbps.  On the other hand, a Windows laptop connecting to the router via wireless is able to achieve ~100 Mbps on both downloads and uploads.  Verizon Speedtest shows ~100/~100 for "router", but ~100/ < 1 for "device".  So I'm trying to figure out what's going on in my desktop PC or the wired connection.

I've already swapped in a new G1100 with no effect, also swapped the Ethernet cable for a new one with no effect.

In case it matters, the Ethernet controller in the Dell desktop is a Killer E2400.

Any troubleshooting suggestions will be much appreciated!

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Correct answers
Re: Very slow Fios upload speeds via Ethernet
tal_145
Enthusiast - Level 1

Fixed by disabling Large Send Offload (IPv4) in the Ethernet controller settings.

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Re: Very slow Fios upload speeds via Ethernet
tal_145
Enthusiast - Level 1

Fixed by disabling Large Send Offload (IPv4) in the Ethernet controller settings.