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21 .TH PCAP-LINKTYPE @MAN_MISC_INFO@ "6 April 2020"
22 .SH NAME
23 pcap-linktype \- link-layer header types supported by libpcap
24 .SH DESCRIPTION
25 For a live capture or ``savefile'', libpcap supplies, as the return
26 value of the
27 .BR pcap_datalink (3PCAP)
28 routine, a value that indicates the type of link-layer header at the
29 beginning of the packets it provides. This is not necessarily the type
30 of link-layer header that the packets being captured have on the network
31 from which they're being captured; for example, packets from an IEEE
32 802.11 network might be provided by libpcap with Ethernet headers that
33 the network adapter or the network adapter driver generates from the
34 802.11 headers. The names for those values begin with
35 .BR DLT_ ,
36 so they are sometimes called "DLT_ values".
37 .PP
38 The values stored in the link-layer header type field in the savefile
39 header are, in most but not all cases, the same as the values returned
40 by
41 .BR pcap_datalink ().
42 The names for those values begin with
43 .BR LINKTYPE_ .
44 .PP
45 The link-layer header types supported by libpcap are described at
46 https://www.tcpdump.org/linktypes.html .
47 .SH SEE ALSO
48 .BR pcap (3PCAP)