Great question — answering as the UphillTech team:
It's a BSD system, so it's all documented in the ifconfig manual page ( https://www.freebsd.org/cgi/man.cgi?ifconfig ). Basically, it's "ifconfig em0 -rxcsum -txcsum -tso -lro" to disable, and the same thing without dashes ("-") to enable. Substitute "em0" with your interface name; do "ifconfig" without arguments to show available interfaces.
Full answer by Edward Tomasz Napierala: https://superuser.stackexchange.com/a/984923 (CC BY-SA 3.0).
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