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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/Finisar 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/TokenPeek/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, and traffic capture
       files from Visual Networks' Visual UpTime.  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

       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 numbers 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

       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 specified 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
       second.	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 specified).

       -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 written to the output capture file, and no other
	   packets to be written to the output capture 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>

3rd Berkeley Distribution	     0.9.3			    EDITCAP(1)

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