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EDITCAP(1)			  The Ethereal Network Analyzer 		       EDITCAP(1)

       editcap - Edit and/or translate the format of capture files

       editcap [ -F file format ] [ -T encapsulation type ] [ -r ] [ -v ] [ -s snaplen ]
       [ -t time adjustment ] [ -h ] infile outfile [ record# ... ]

       Editcap is a program that reads a saved capture file and writes some or all of the packets
       in that capture file to another capture file.  Editcap knows how to read libpcap capture
       files, including those of tcpdump, Ethereal, and other tools that write captures in that
       format.	In addition, Editcap can read capture files from snoop and atmsnoop, Shomiti/Fin-
       isar Surveyor, Novell LANalyzer, Network General/Network Associates DOS-based Sniffer
       (compressed or uncompressed), Microsoft Network Monitor, AIX's iptrace, Cinco Networks
       NetXRay, Network Associates Windows-based Sniffer, AG Group/WildPackets EtherPeek/Token-
       Peek/AiroPeek, RADCOM's WAN/LAN analyzer, Lucent/Ascend router debug output, HP-UX's
       nettl, the dump output from Toshiba's ISDN routers, the output from i4btrace from the
       ISDN4BSD project, the output in IPLog format from the Cisco Secure Intrusion Detection
       System, pppd logs (pppdump format), the output from VMS's TCPIPtrace utility, the text
       output from the DBS Etherwatch VMS utility, traffic capture files from Visual Networks'
       Visual UpTime and the output from CoSine L2 debug. There is no need to tell Editcap what
       type of file you are reading; it will determine the file type by itself.  Editcap is also
       capable of reading any of these file formats if they are compressed using gzip.	Editcap
       recognizes this directly from the file; the '.gz' extension is not required for this pur-

       By default, it writes the capture file in libpcap format, and writes all of the packets in
       the capture file to the output file.  The -F flag can be used to specify the format in
       which to write the capture file; it can write the file in libpcap format (standard libpcap
       format, a modified format used by some patched versions of libpcap, the format used by Red
       Hat Linux 6.1, or the format used by SuSE Linux 6.3), snoop format, uncompressed Sniffer
       format, Microsoft Network Monitor 1.x format, the format used by Windows-based versions of
       the Sniffer software, and the format used by Visual Networks' software.

       A list of packet numbers can be specified on the command line; the packets with those num-
       bers will not be written to the capture file, unless the -r flag is specified, in which
       case only those packets will be written to the capture file.  Ranges of packet numbers can
       be specified as start-end, referring to all packets from start to end (removing them all
       if -r isn't specified, including them all if -r is specified).

       If the -s flag is used to specify a snapshot length, frames in the input file with more
       captured data than the specified snapshot length will have only the amount of data speci-
       fied by the snapshot length written to the output file.	This may be useful if the program
       that is to read the output file cannot handle packets larger than a certain size (for
       example, the versions of snoop in Solaris 2.5.1 and Solaris 2.6 appear to reject Ethernet
       frames larger than the standard Ethernet MTU, making them incapable of handling gigabit
       Ethernet captures if jumbo frames were used).

       If the -t flag is used to specify a time adjustment, the specified adjustment will be
       applied to all selected frames in the capture file.  The adjustment is specified as
       [-]seconds[.fractional seconds].  For example, -t 3600 advances the timestamp on selected
       frames by one hour while -t -0.5 reduces the timestamp on selected frames by one-half sec-
       ond.  This feature is useful when synchronizing dumps collected on different machines
       where the time difference between the two machines is known or can be estimated.

       If the -T flag is used to specify an encapsulation type, the encapsulation type of the
       output capture file will be forced to the specified type, rather than being the type
       appropriate to the encapsulation type of the input capture file.  Note that this merely
       forces the encapsulation type of the output file to be the specified type; the packet
       headers of the packets will not be translated from the encapsulation type of the input
       capture file to the specified encapsulation type (for example, it will not translate an
       Ethernet capture to an FDDI capture if an Ethernet capture is read and '-T fddi' is speci-

       -F  Sets the file format of the output capture file.

       -T  Sets the packet encapsulation type of the output capture file.

       -r  Causes the packets whose packet numbers are specified on the command line to be writ-
	   ten to the output capture file, and no other packets to be written to the output cap-
	   ture file.

       -v  Causes editcap to print a number of messages while it's working.

       -s  Sets the snapshot length to use when writing the data.

       -t  Sets the time adjustment to use on selected frames.

       -h  Prints the version and options and exits.

       tcpdump(8), pcap(3), ethereal(1), mergecap(1)

       Editcap is part of the Ethereal distribution.  The latest version of Ethereal can be found
       at http://www.ethereal.com.

	 Original Author
	 -------- ------
	 Richard Sharpe 	  <sharpe@ns.aus.com>

	 Guy Harris		  <guy@alum.mit.edu>

0.9.8					    2002-08-08				       EDITCAP(1)
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