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pcap-linktype.manmisc.in

pcap-linktype.manmisc.in 2.3 KB
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    21. 

  21. .TH PCAP-LINKTYPE @MAN_MISC_INFO@ "7 April 2014"
    22. 

  22. .SH NAME
    23. 

  23. pcap-linktype \- link-layer header types supported by libpcap
    24. 

  24. .SH DESCRIPTION
    25. 

  25. For a live capture or ``savefile'', libpcap supplies, as the return
    26. 

  26. value of the
    27. 

  27. .BR pcap_datalink (3PCAP)
    28. 

  28. routine, a value that indicates the type of link-layer header at the
    29. 

  29. beginning of the packets it provides.  This is not necessarily the type
    30. 

  30. of link-layer header that the packets being captured have on the network
    31. 

  31. from which they're being captured; for example, packets from an IEEE
    32. 

  32. 802.11 network might be provided by libpcap with Ethernet headers that
    33. 

  33. the network adapter or the network adapter driver generates from the
    34. 

  34. 802.11 headers.  The names for those values begin with
    35. 

  35. .BR DLT_ ,
    36. 

  36. so they are sometimes called "DLT_ values".
    37. 

  37. .PP
    38. 

  38. The values stored in the link-layer header type field in the savefile
    39. 

  39. header are, in most but not all cases, the same as the values returned
    40. 

  40. by
    41. 

  41. .BR pcap_datalink() .
    42. 

  42. The names for those values begin with
    43. 

  43. .BR LINKTYPE_ .
    44. 

  44. .PP
    45. 

  45. The link-layer header types supported by libpcap are described at
    46. 

  46. https://www.tcpdump.org/linktypes.html.
    47. 

  47. .SH SEE ALSO
    48. 

  48. pcap_datalink(3PCAP)
    49.