Further emphasize its non-portability, and give a use case.

Further emphasize that it works only on Linux, and only works there with
regular network interfaces.

Note that if some packets have a socket-layer protocol type that differs
from the protocol type in the link-layer header, you can only restrict
capture to those packets by using pcap_set_protocol().  (That's the
Arista sFlow-sampled packets case.)

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