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.\" Copyright (c) 1987, 1988, 1989, 1990, 1991, 1992, 1994, 1995, 1996, 1997
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.\" the University nor the names of its contributors may be used to endorse
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2017-02-12 07:04:44 +00:00
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.TH PCAP-LINKTYPE @MAN_MISC_INFO@ "7 April 2014"
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2009-03-21 20:43:56 +00:00
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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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2012-01-31 17:22:07 +00:00
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The link-layer header types supported by libpcap are described at
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2019-10-06 04:26:37 +00:00
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https://www.tcpdump.org/linktypes.html.
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.SH SEE ALSO
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2019-10-06 04:26:37 +00:00
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pcap(3PCAP)
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