How can I turn off the following in FreeBSD?
- tx checksum offloading
- rx checksum offloading
- tcp segment offloading
- large segment offloading
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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.
ifconfig nfe0 -txcsum -rxcsum