51 lines
2.4 KiB
Plaintext
51 lines
2.4 KiB
Plaintext
.\" @(#) $Header: /tcpdump/master/libpcap/pcap-linktype.manmisc.in,v 1.3 2008-10-27 22:52:30 guy Exp $
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.\" Copyright (c) 1987, 1988, 1989, 1990, 1991, 1992, 1994, 1995, 1996, 1997
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.\" ``This product includes software developed by the University of California,
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.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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.TH PCAP-LINKTYPE @MAN_MISC_INFO@ "23 October 2008"
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.SH NAME
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pcap-linktype \- link-layer header types supported by libpcap
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.SH DESCRIPTION
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For a live capture or ``savefile'', libpcap supplies, as the return
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value of the
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.BR pcap_datalink (3PCAP)
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routine, a value that indicates the type of link-layer header at the
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beginning of the packets it provides. This is not necessarily the type
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of link-layer header that the packets being captured have on the network
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from which they're being captured; for example, packets from an IEEE
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802.11 network might be provided by libpcap with Ethernet headers that
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the network adapter or the network adapter driver generates from the
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802.11 headers. The names for those values begin with
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.BR DLT_ ,
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so they are sometimes called "DLT_ values".
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.PP
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The values stored in the link-layer header type field in the savefile
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header are, in most but not all cases, the same as the values returned
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by
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.BR pcap_datalink() .
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The names for those values begin with
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.BR LINKTYPE_ .
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.PP
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The link-layer header types supported by libpcap are described at
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http://www.tcpdump.org/linktypes.html.
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.SH SEE ALSO
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pcap_datalink(3PCAP)
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