What packet capturing facilities are available?

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Answer:

Depending on your operating system (different versions may vary):

BPF: Berkeley Packet Filter. Commonly found on BSD variants.
DLPI: Data Link Provider Interface. Solaris, HP-UX, SCO Openserver.
NIT: Network Interface Tap. SunOS 3.
SNOOP: (???). IRIX.
SNIT: STREAMS Network Interface Tap. SunOS 4.
SOCK_PACKET: Linux.
LSF: Linux Socket Filter. Is available on Linux 2.1.75 onwards.
drain: Used to snoop packets dropped by the OS. IRIX.