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DHCPDUMP

DHCPDUMP

Section: User Contributed Software (8) Updated: 23 June 2008
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NAME

dhcpdump - DHCP packet dumper  

SYNOPSIS

dhcpdump [-h regular-expression] -i interface  

DESCRIPTION

This command parses the output of tcpdump to display the dhcp-packets for easier checking and debugging.  

USAGE

dhcpdump -i /dev/fxp0

If you want to filter a specific Client Hardware Address (CHADDR), then you can specifiy it as a regular expressions:

dhcpdump -i /dev/fxp0 -h ^00:c0:4f

This will display only the packets with Client Hardware Addresses which start with 00:c0:4f.  

OUTPUT

  TIME: 15:45:02.084272
    IP: 0.0.0.0.68 (0:c0:4f:82:ac:7f) > 255.255.255.255.67 (ff:ff:ff:ff:ff:ff)
    OP: 1 (BOOTPREQUEST)
 HTYPE: 1 (Ethernet)
  HLEN: 6
  HOPS: 0
   XID: 28f61b03
  SECS: 0
 FLAGS: 0
CIADDR: 0.0.0.0
YIADDR: 0.0.0.0
SIADDR: 0.0.0.0
GIADDR: 0.0.0.0
CHADDR: 00:c0:4f:82:ac:7f:00:00:00:00:00:00:00:00:00:00
 SNAME: .
 FNAME: .
OPTION:  53 (  1) DHCP message type         3 (DHCPREQUEST)
OPTION:  54 (  4) Server identifier         130.139.64.101
OPTION:  50 (  4) Request IP address        130.139.64.143
OPTION:  55 (  7) Parameter Request List      1 (Subnet mask)
                                              3 (Routers)
                                             58 (T1)
                                             59 (T2)

At the option field, the first field is the value of the option, the second one (between brackets) is the length of the option-datafield, the third field is the name of the option, the fourth field is the data of the option.  

RETURN VALUES

Always 0.  

NOTES

Privileged access is often needed for accessing the interface.  

BUGS

Not all the parameter options are printed verbose, because of lack of documentation. Not all the options are tested, because of lack of clients/servers with these options. If you have a dump of one of them, please send them to me and I'll incorperate them.  

THANKS TO

Ralph Droms and Ted Lemons ``The DHCP Handbook'', ISBN 1-57870-137-6.

Peter Apian-Bennewitz <apian@ise.fhg.de> for his Client Hardware Address filtering  

AUTHOR

Edwin Groothuis, edwin@mavetju.org (http://www.mavetju.org)  

SEE ALSO

dhcpd(8), tcpdump(1), RFC2132


 

Index

NAME
SYNOPSIS
DESCRIPTION
USAGE
OUTPUT
RETURN VALUES
NOTES
BUGS
THANKS TO
AUTHOR
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 22:01:30 GMT, April 16, 2011