On 8/27/22 12:00 PM, Sean Donelan wrote:
Hopefully, my pain will help someone else.
I've had sporadic Internet slowdowns and stuck networking since IPv6
was enabled on my FIOS ONT a few months ago.
After too much troubleshooting, I found out some older Intel GbE
ethernet cards have a IPv6 Checksum Offload incompatibility with
certain fiber ONT terminals. As Verizon is enabling IPv6 on its FIOS
network, you might find intermittent network problems.
Intermittent are the worst kind of problems.
In some situations where a client machine is connected via some
specific Optical Network Terminals (ONTs), and data is appended after
the packet checksum, the network adapter can drop receive packets when
using TCP-IPv6 Checksum Offload for receive traffic.
Intel published an alert in 2017, but I didn't have IPv6 on FIOS then.
https://www.intel.com/content/www/us/en/download/19174/disabling-tcp-ipv6-checksum-offload-capability-with-intel-1-10-gbe-controllers.html
TLDR; turn off TCP IPv6 Checksum Offload
Affects all operating systems (Windows, BSD, Linux, etc) using the
affected wired Intel ethernet controllers. Not a problem with Intel
WiFi.
My reaction is "offload from what"? Isn't this all done in silicon?
Mike
