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| .TH PCAP-LINKTYPE @MAN_MISC_INFO@ "23 October 2008" |
| .SH NAME |
| pcap-linktype \- link-layer header types supported by libpcap |
| .SH DESCRIPTION |
| For a live capture or ``savefile'', libpcap supplies, as the return |
| value of the |
| .BR pcap_datalink (3PCAP) |
| 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 |
| .BR DLT_ , |
| so they are sometimes called "DLT_ values". |
| .PP |
| 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 |
| .BR pcap_datalink() . |
| The names for those values begin with |
| .BR LINKTYPE_ . |
| .PP |
| The link-layer header types supported by libpcap are described at |
| http://www.tcpdump.org/linktypes.html. |
| .SH SEE ALSO |
| pcap_datalink(3PCAP) |
