VZ FIOS and Intel TCP IPv6 Checksum Offload problems
William Herrin
bill at herrin.us
Sun Aug 28 02:16:04 UTC 2022
On Sat, Aug 27, 2022 at 12:00 PM Sean Donelan <sean at donelan.com> wrote:
> 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.
Hi Sean,
Do you happen to have any details on the bug? I note that the IPv6
header DOES NOT HAVE a checksum; it relies on the checksum in the
layer-2 frame. I'm not clear how you "append" bytes to the ethernet
frame "after" calculating the checksum, have the hardware checksum
fail but have the software checksum succeed.
Regards,
Bill Herrin
--
For hire. https://bill.herrin.us/resume/
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