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.TH dhcping 8 "Januari 27, 2002" "Januari 27, 2002" "General Commands Manual" |
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.UC |
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.\} |
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.rm #[ #] #H #V #F C |
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.SH "NAME" |
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\fBdhcping\fR \- send a DHCP request to DHCP server to see if it's up and running |
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.SH "SYNOPSIS" |
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\fBdhcping\fR |
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[\fB\-v\fR] [\fB\-q\fR] [\fB\-i\fR] [\fB\-r\fR] |
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\fB\-t\fR \fImaxwait\fR |
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\fB\-c\fR \fIclient-IP\-address\fR |
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\fB\-s\fR \fIserver-IP\-address\fR |
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\fB\-h\fR \fIclient-hardware-address\fR |
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[\fB\-g\fR \fIgateway-IP\-address\fR] |
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.SH "DESCRIPTION" |
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This command allows the system administrator to check if a remote |
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DHCP server is still functioning. |
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.PP |
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Options are: |
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.Ip "\fB\-v\fR" 5 |
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Verbose, print some information. |
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.Ip "\fB\-i\fR" 5 |
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Use \s-1DHCPINFORM\s0 packets. |
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.Ip "\fB\-r\fR" 5 |
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Use \s-1DHCPREQUEST\s0 packets (default behaviour). |
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.Ip "\fB\-q\fR" 5 |
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Quiet, print nothing on the screen. |
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.Ip "\fB\-t\fR \fImaxwait\fR" 5 |
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Maximum time to wait for an answer from the server in seconds. |
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Default is 3 seconds. |
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.Ip "\fB\-c\fR \fIclient-\s-1IP\s0\-address\fR" 5 |
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Request this \s-1IP\s0 address. Note that this is also the \s-1IP\s0 address the |
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answer will be sent to. |
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.Ip "\fB\-s\fR \fIserver-\s-1IP\s0\-address\fR" 5 |
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Send the \s-1DHCP\s0 packet to this \s-1IP\s0 address. |
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.Ip "\fB\-h\fR \fIclient-hardware-address\fR" 5 |
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Use this hardware-address in the \s-1DHCP\s0 request. It can be up to |
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sixteen octets seperated by colons (i.e. 01:02:03:04) |
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.Ip "\fB\-g\fR \fIgateway-\s-1IP\s0\-address\fR" 5 |
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Use this \s-1IP\s0 address for the gateway \s-1IP\s0 address in the \s-1DHCP\s0 packet. |
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This option is currently broken. |
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.SH "RETURN VALUES" |
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If everything goes okay, it returns 0. If there went something |
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wrong, it returns 1. |
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.SH "SETUP" |
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This program should be installed setuid root or ran by root only. |
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See SECURITY for more information. |
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.PP |
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On your DHCP server, add these lines to the dhcpd.conf: |
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.PP |
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.Vb 4 |
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\& host <your monitoring host FQDN> { |
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\& hardware ethernet <your monitor host mac address>; |
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\& fixed-address <your monitoring host IP address>; |
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\& } |
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.Ve |
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Then try it: |
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.PP |
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$ dhcping \-c \fIyour monitoring host IP address\fR \e |
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\-s \fIyour DHCP server IP address\fR \e |
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\-h \fIyour monitor host mac address\fR |
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.PP |
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It will either respond with \*(L"no answer\*(R" or \*(L"Got answer from: \fIyour |
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DHCP server IP address\fR\*(R" |
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.PP |
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The DHCP server logfile will give: |
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DHCPREQUEST\ for\ 192.168.1.1\ from\ 00:20:18:56:29:8f\ via\ ed0 |
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DHCPACK\ on\ 192.168.1.1\ to\ 00:20:18:56:29:8f\ via\ ed0 |
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DHCPRELEASE\ of\ 192.168.1.1\ from\ 00:20:18:56:29:8f\ via\ ed0\ (found) |
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.PP |
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Running in DHCPINFORM mode with \fB\-i\fR: |
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.PP |
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If you see \*(L"DHCPINFORM from 192.168.1.1 via xl0: not authoritative |
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for subnet 192.168.1.0\*(R", you should add the authoritative statement |
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to the subnet, See dhcpd.\fIconf\fR\|(5) for details. |
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.PP |
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When running in very verbose mode, \fBdhcping\fR tries to dump all |
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data of the send and received DHCP packets. It will first dump the |
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packet in hex-format, then decodes the header and finally the |
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options. |
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.SH "HOW IT WORKS" |
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The client either sends a DHCPREQUEST or DHCPINFORM packet to the |
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server and waits for an answer. Then, if a DHCPREQUEST was send, |
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it will send a DHCPRELEASE back to the server. |
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.SH "SECURITY" |
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This program is installed setuid root as it requires the privileges |
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to bind itself to port 68 (bootpc). Root privileges are dropped as |
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soon as the program has bound itself to that port. |
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.SH "BUGS" |
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Currently (this may, or may not, change in the future) the ISC DHCP |
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daemon does not write leases with a fixed IP address in the |
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dhcpd.leases file. |
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.PP |
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DHCPINFORM packets can only be used on subnets the server is authori- |
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tative for. If the monitoring script runs on a subnet the server |
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isn't authoritative for, it should use the DHCPREQUEST packets. I |
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also experienced some problems with ISC DHCPD v2 servers, but that |
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is also in the README of it. |
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.PP |
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The \fB\-V\fR option is still working, but shouldn't be used for |
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debugging of the packets. Better use \fIdhcpdump\fR\|(8) for that, which |
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is available on my website. I wanted to remove it, but decided only |
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to do it from the documentation, not from the code. Maybe I'll need |
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it one day for debugging. |
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.SH "AUTHOR" |
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Edwin Groothuis, edwin@mavetju.org (http://www.mavetju.org) |
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.SH "SEE ALSO" |
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\fIdhcpd\fR\|(8), \fIdhclient\fR\|(8), dhcpd.\fIconf\fR\|(5), \fIdhcpdump\fR\|(8) |
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|
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.rn }` '' |
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.IX Title "dhcping 8" |
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.IX Name "B<dhcping> - send a DHCP request to DHCP server to see if it's up and running" |
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|
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.IX Header "NAME" |
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|
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.IX Header "SYNOPSIS" |
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|
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.IX Header "DESCRIPTION" |
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|
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.IX Item "\fB\-v\fR" |
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|
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.IX Item "\fB\-i\fR" |
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|
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.IX Item "\fB\-r\fR" |
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|
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.IX Item "\fB\-q\fR" |
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|
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.IX Item "\fB\-t\fR \fImaxwait\fR" |
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|
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.IX Item "\fB\-c\fR \fIclient-\s-1IP\s0\-address\fR" |
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|
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.IX Item "\fB\-s\fR \fIserver-\s-1IP\s0\-address\fR" |
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|
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.IX Item "\fB\-h\fR \fIclient-hardware-address\fR" |
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|
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.IX Item "\fB\-g\fR \fIgateway-\s-1IP\s0\-address\fR" |
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|
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.IX Header "RETURN VALUES" |
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|
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.IX Header "SETUP" |
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|
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.IX Header "HOW IT WORKS" |
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|
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.IX Header "SECURITY" |
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|
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.IX Header "BUGS" |
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|
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.IX Header "AUTHOR" |
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|
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.IX Header "SEE ALSO" |
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|
