PCAP-LINKTYPE(7)   FreeBSD Miscellaneous Information Manual   PCAP-LINKTYPE(7)

NAME

     pcap-linktype - link-layer header types supported by libpcap

DESCRIPTION

     For a live capture or ``savefile'', libpcap supplies, as the return value
     of the pcap_datalink(3) routine, a value that indicates the type of link-
     layer header at the beginning of the packets it provides.  This is not
     necessarily the type of link-layer header that the packets being captured
     have on the network from which they're being captured; for example,
     packets from an IEEE 802.11 network might be provided by libpcap with
     Ethernet headers that the network adapter or the network adapter driver
     generates from the 802.11 headers.  The names for those values begin with
     DLT_, so they are sometimes called "DLT_ values".

     The values stored in the link-layer header type field in the savefile
     header are, in most but not all cases, the same as the values returned by
     pcap_datalink().  The names for those values begin with LINKTYPE_.

     The link-layer header types supported by libpcap are described at
     https://www.tcpdump.org/linktypes.html .

SEE ALSO

     pcap(3)

                                 6 April 2020                 PCAP-LINKTYPE(7)