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.\" ========================================================================
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.IX Title "DHCPDUMP 1"
.TH DHCPDUMP 1 "November 21, 2003" "November 21, 2003" "General Commands Manual"
.SH "NAME"
\&\fBdhcpdump\fR \- DHCP packet dumper
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBdhcpdump\fR [\fB\-h\fR \fIregular-expression\fR]
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This command parses the output of tcpdump to display the dhcp-packets for
easier checking and debugging.
.SH "USAGE"
.IX Header "USAGE"
tcpdump\ \-lenx\ \-s\ 1500\ port\ bootps\ or\ port\ bootpc\ |\ dhcpdump
.PP
If you want to filter a specific Client Hardware Address (\s-1CHADDR\s0), then
you can specifiy it as a regular expressions:
.PP
tcpdump\ \-lenx\ \-s\ 1500\ port\ bootps\ or\ port\ bootpc\ |\ dhcpdump\ \-h\ ^00:c0:4f
.PP
This will display only the packets with Client Hardware Addresses
which start with 00:c0:4f.
.SH "OUTPUT"
.IX Header "OUTPUT"
.Vb 23
\&  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)
.Ve
.PP
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.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
Always 0.
.SH "NOTES"
.IX Header "NOTES"
Privileged access is often needed for tcpdump.
.SH "BUGS"
.IX Header "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.
.SH "THANKS TO"
.IX Header "THANKS TO"
Ralph Droms and Ted Lemons \*(L"The \s-1DHCP\s0 Handbook\*(R", \s-1ISBN\s0 1\-57870\-137\-6.
.PP
Peter Apian-Bennewitz <apian@ise.fhg.de> for his Client Hardware
Address filtering
.SH "AUTHOR"
.IX Header "AUTHOR"
Edwin Groothuis, edwin@mavetju.org (http://www.mavetju.org)
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIdhcpd\fR\|(8), \fItcpdump\fR\|(1), \s-1RFC2132\s0