Updated: 2022/Sep/29

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PCAP-LINKTYPE(7)       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)