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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" dhcpdump \- DHCP packet dumper .SH "SYNOPSIS" .IX Header "SYNOPSIS" \&\fBdhcpdump\fR [\fB\-h\fR \fIregular-expression\fR] \fB\-i\fR \fIinterface\fR .SH "DESCRIPTION" .IX Header "DESCRIPTION" This command listens on a network interface to display the dhcp-packets for easier checking and debugging. .SH "USAGE" .IX Header "USAGE" dhcpdump\ \-i\ /dev/fxp0 .PP If you want to filter a specific Client Hardware Address (\s-1CHADDR\s0), then you can specify it as a regular expressions: .PP dhcpdump\ \-i\ /dev/fxp0\ \-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 10 \& 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 accessing the interface. .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 incorporate them. .SH "THANKS TO" .IX Header "THANKS TO" Ralph Droms and Ted Lemons \*(L"The \s-1DHCP\s0 Handbook\*(R", \s-1ISBN 1\-57870\-137\-6.\s0 .PP Peter Apian-Bennewitz 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" \&\fBdhcpd\fR\|(8), \fBtcpdump\fR\|(1), \s-1RFC2132\s0