On network interface devices on Linux, pcap_set_protocol_linux() sets
the protocol to be used in the socket(2) call to create a capture
socket when the handle is activated. The argument is a link-layer
protocol value, such as the values in the <linux/if_ether.h> header
file, specified in host byte order. If protocol is non-zero, packets
of that protocol will be captured when the handle is activated,
otherwise, all packets will be captured. This function is only
provided on Linux, and, if it is used on any device other than a
network interface, it will have no effect.
It should not be used in portable code; instead, a filter should be
specified with pcap_setfilter(3PCAP).
If a given network interface provides a standard link-layer header,
with a standard packet type, but provides some packet types with a
different socket-layer protocol type from the one in the link-layer
header, that packet type cannot be filtered with a filter specified
with pcap_setfilter() but can be filtered by specifying the socket-
layer protocol type using pcap_set_protocol_linux().
This page is part of the libpcap (packet capture library) project.
Information about the project can be found at
⟨http://www.tcpdump.org/⟩. If you have a bug report for this manual
page, see ⟨http://www.tcpdump.org/#patches⟩. This page was obtained
from the project's upstream Git repository
⟨https://github.com/the-tcpdump-group/libpcap.git⟩ on 2020-07-14.
(At that time, the date of the most recent commit that was found in
the repository was 2020-07-04.) If you discover any rendering prob‐
lems in this HTML version of the page, or you believe there is a bet‐
ter or more up-to-date source for the page, or you have corrections
or improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to firstname.lastname@example.org
22 August 2018 PCAP_SET_PROTOCOL_LINUX(3PCAP)