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Just point to the tcpdump.org Web page for descriptions of link-layer

types.
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1 parent 5f461e4 commit 7766130c67ed109eaf84340204c32dd8189bedcc @guyharris guyharris committed Mar 13, 2011
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The names for those values begin with
.BR LINKTYPE_ .
.PP
-The link-layer header types supported by libpcap are listed here. The
-value corresponding to
-.B LINKTYPE_
-names are given; the value corresponding to
-.B DLT_
-values are, in some cases, platform dependent, and are not given;
-applications should check for particular
-.B DLT_
-values by name.
-.RS 5
-.TP 5
-.BR DLT_NULL "; " LINKTYPE_NULL = 0
-BSD loopback encapsulation; the link-layer header is a 4-byte field, in
-.I host
-byte order, containing a PF_ value from
-.B socket.h
-for the network-layer protocol of the packet.
-.IP
-Note that ``host byte order'' is the byte order of the machine on which
-the packets are captured, and the PF_ values are for the OS of the
-machine on which the packets are captured; if a live capture is being
-done, ``host byte order'' is the byte order of the machine capturing the
-packets, and the PF_ values are those of the OS of the machine capturing
-the packets, but if a ``savefile'' is being read, the byte order and PF_
-values are
-.I not
-necessarily those of the machine reading the capture file.
-.TP 5
-.BR DLT_EN10MB "; " LINKTYPE_ETHERNET = 1
-Ethernet (10Mb, 100Mb, 1000Mb, and up); the
-.B 10MB
-in the
-.B DLT_
-name is historical.
-.TP 5
-.BR DLT_IEEE802 "; " LINKTYPE_TOKEN_RING = 6
-IEEE 802.5 Token Ring; the
-.B IEEE802
-in the
-.B DLT_
-name is historical.
-.TP 5
-.BR DLT_ARCNET "; " LINKTYPE_ARCNET = 7
-ARCNET
-.TP 5
-.BR DLT_SLIP "; " LINKTYPE_SLIP = 8
-SLIP; the link-layer header contains, in order:
-.RS 10
-.LP
-a 1-byte flag, which is 0 for packets received by the machine and 1 for
-packets sent by the machine;
-.LP
-a 1-byte field, the upper 4 bits of which indicate the type of packet,
-as per RFC 1144:
-.RS 5
-.TP 5
-0x40
-an unmodified IP datagram (TYPE_IP);
-.TP 5
-0x70
-an uncompressed-TCP IP datagram (UNCOMPRESSED_TCP), with that byte being
-the first byte of the raw IP header on the wire, containing the
-connection number in the protocol field;
-.TP 5
-0x80
-a compressed-TCP IP datagram (COMPRESSED_TCP), with that byte being the
-first byte of the compressed TCP/IP datagram header;
-.RE
-.LP
-for UNCOMPRESSED_TCP, the rest of the modified IP header, and for
-COMPRESSED_TCP, the compressed TCP/IP datagram header;
-.RE
-.RS 5
-.LP
-for a total of 16 bytes; the uncompressed IP datagram follows the header.
-.RE
-.TP 5
-.BR DLT_PPP "; " LINKTYPE_PPP = 9
-PPP; if the first 2 bytes are 0xff and 0x03, it's PPP in HDLC-like
-framing, with the PPP header following those two bytes, otherwise it's
-PPP without framing, and the packet begins with the PPP header.
-.TP 5
-.BR DLT_FDDI "; " LINKTYPE_FDDI = 10
-FDDI
-.TP 5
-.BR DLT_ATM_RFC1483 "; " LINKTYPE_ATM_RFC1483 = 100
-RFC 1483 LLC/SNAP-encapsulated ATM; the packet begins with an IEEE 802.2
-LLC header.
-.TP 5
-.BR DLT_RAW "; " LINKTYPE_RAW = 101
-raw IP; the packet begins with an IP header.
-.TP 5
-.BR DLT_PPP_SERIAL "; " LINKTYPE_PPP_HDLC = 50
-PPP in HDLC-like framing, as per RFC 1662, or Cisco PPP with HDLC
-framing, as per section 4.3.1 of RFC 1547; the first byte will be 0xFF
-for PPP in HDLC-like framing, and will be 0x0F or 0x8F for Cisco PPP
-with HDLC framing.
-.TP 5
-.BR DLT_PPP_ETHER "; " LINKTYPE_PPP_ETHER = 51
-PPPoE; the packet begins with a PPPoE header, as per RFC 2516.
-.TP 5
-.BR DLT_C_HDLC "; " LINKTYPE_C_HDLC = 104
-Cisco PPP with HDLC framing, as per section 4.3.1 of RFC 1547.
-.TP 5
-.BR DLT_IEEE802_11 "; " LINKTYPE_IEEE802_11 = 105
-IEEE 802.11 wireless LAN
-.TP 5
-.BR DLT_FRELAY "; " LINKTYPE_FRELAY = 107
-Frame Relay
-.TP 5
-.BR DLT_LOOP "; " LINKTYPE_LOOP = 108
-OpenBSD loopback encapsulation; the link-layer header is a 4-byte field, in
-.I network
-byte order, containing a PF_ value from OpenBSD's
-.B socket.h
-for the network-layer protocol of the packet.
-.IP
-Note that, if a ``savefile'' is being read, those PF_ values are
-.I not
-necessarily those of the machine reading the capture file.
-.TP 5
-.BR DLT_LINUX_SLL "; " LINKTYPE_LINUX_SLL = 113
-Linux "cooked" capture encapsulation; the link-layer header contains, in
-order:
-.RS 10
-.LP
-a 2-byte "packet type", in network byte order, which is one of:
-.RS 5
-.TP 5
-0
-packet was sent to us by somebody else
-.TP 5
-1
-packet was broadcast by somebody else
-.TP 5
-2
-packet was multicast, but not broadcast, by somebody else
-.TP 5
-3
-packet was sent by somebody else to somebody else
-.TP 5
-4
-packet was sent by us
-.RE
-.LP
-a 2-byte field, in network byte order, containing a Linux ARPHRD_ value
-for the link-layer device type;
-.LP
-a 2-byte field, in network byte order, containing the length of the
-link-layer address of the sender of the packet (which could be 0);
-.LP
-an 8-byte field containing that number of bytes of the link-layer
-address of the sender (if there are more than 8 bytes, only the first
-8 are present, and if there are fewer than 8 bytes, there are padding
-bytes after the address to pad the field to 8 bytes);
-.LP
-a 2-byte field containing an Ethernet protocol type, in network byte
-order, or containing 1 for Novell 802.3 frames without an 802.2 LLC
-header or 4 for frames beginning with an 802.2 LLC header.
-.RE
-.TP 5
-.BR DLT_LTALK "; " LINKTYPE_LTALK = 104
-Apple LocalTalk; the packet begins with an AppleTalk LLAP header.
-.TP 5
-.BR DLT_PFLOG "; " LINKTYPE_PFLOG = 117
-OpenBSD pflog; the link-layer header contains a
-.B "struct pfloghdr"
-structure, as defined by the host on which the file was saved. (This
-differs from operating system to operating system and release to
-release; there is nothing in the file to indicate what the layout of
-that structure is.)
-.TP 5
-.BR DLT_PRISM_HEADER "; " LINKTYPE_PRISM_HEADER = 119
-Prism monitor mode information followed by an 802.11 header.
-.TP 5
-.BR DLT_IP_OVER_FC "; " LINKTYPE_IP_OVER_FC = 122
-RFC 2625 IP-over-Fibre Channel, with the link-layer header being the
-Network_Header as described in that RFC.
-.TP 5
-.BR DLT_SUNATM "; " LINKTYPE_SUNATM = 123
-SunATM devices; the link-layer header contains, in order:
-.RS 10
-.LP
-a 1-byte flag field, containing a direction flag in the uppermost bit,
-which is set for packets transmitted by the machine and clear for
-packets received by the machine, and a 4-byte traffic type in the
-low-order 4 bits, which is one of:
-.RS 5
-.TP 5
-0
-raw traffic
-.TP 5
-1
-LANE traffic
-.TP 5
-2
-LLC-encapsulated traffic
-.TP 5
-3
-MARS traffic
-.TP 5
-4
-IFMP traffic
-.TP 5
-5
-ILMI traffic
-.TP 5
-6
-Q.2931 traffic
-.RE
-.LP
-a 1-byte VPI value;
-.LP
-a 2-byte VCI field, in network byte order.
-.RE
-.TP 5
-.BR DLT_IEEE802_11_RADIO "; " LINKTYPE_IEEE802_11_RADIO = 127
-link-layer information followed by an 802.11 header - see
-http://www.shaftnet.org/~pizza/software/capturefrm.txt for a description
-of the link-layer information.
-.TP 5
-.BR DLT_ARCNET_LINUX "; " LINKTYPE_ARCNET_LINUX = 129
-ARCNET, with no exception frames, reassembled packets rather than raw
-frames, and an extra 16-bit offset field between the destination host
-and type bytes.
-.TP 5
-.BR DLT_LINUX_IRDA "; " LINKTYPE_LINUX_IRDA = 144
-Linux-IrDA packets, with a
-.B DLT_LINUX_SLL
-header followed by the IrLAP header.
-.TP 5
-.BR DLT_LINUX_LAPD "; " LINKTYPE_LINUX_LAPD = 177
-LAPD (Q.921) frames, with a
-.B DLT_LINUX_SLL
-header captured via vISDN.
-.RE
+The link-layer header types supported by libpcap are described at
+http://www.tcpdump.org/linktypes.html.
.SH SEE ALSO
pcap_datalink(3PCAP)

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