1: .rn '' }`
2: ''' $RCSfile: dhcping.8,v $$Revision: 1.1.1.1 $$Date: 2012/02/21 22:27:53 $
3: '''
4: ''' $Log: dhcping.8,v $
5: ''' Revision 1.1.1.1 2012/02/21 22:27:53 misho
6: ''' dhcping
7: '''
8: '''
9: .de Sh
10: .br
11: .if t .Sp
12: .ne 5
13: .PP
14: \fB\\$1\fR
15: .PP
16: ..
17: .de Sp
18: .if t .sp .5v
19: .if n .sp
20: ..
21: .de Ip
22: .br
23: .ie \\n(.$>=3 .ne \\$3
24: .el .ne 3
25: .IP "\\$1" \\$2
26: ..
27: .de Vb
28: .ft CW
29: .nf
30: .ne \\$1
31: ..
32: .de Ve
33: .ft R
34:
35: .fi
36: ..
37: '''
38: '''
39: ''' Set up \*(-- to give an unbreakable dash;
40: ''' string Tr holds user defined translation string.
41: ''' Bell System Logo is used as a dummy character.
42: '''
43: .tr \(*W-|\(bv\*(Tr
44: .ie n \{\
45: .ds -- \(*W-
46: .ds PI pi
47: .if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
48: .if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
49: .ds L" ""
50: .ds R" ""
51: ''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
52: ''' \*(L" and \*(R", except that they are used on ".xx" lines,
53: ''' such as .IP and .SH, which do another additional levels of
54: ''' double-quote interpretation
55: .ds M" """
56: .ds S" """
57: .ds N" """""
58: .ds T" """""
59: .ds L' '
60: .ds R' '
61: .ds M' '
62: .ds S' '
63: .ds N' '
64: .ds T' '
65: 'br\}
66: .el\{\
67: .ds -- \(em\|
68: .tr \*(Tr
69: .ds L" ``
70: .ds R" ''
71: .ds M" ``
72: .ds S" ''
73: .ds N" ``
74: .ds T" ''
75: .ds L' `
76: .ds R' '
77: .ds M' `
78: .ds S' '
79: .ds N' `
80: .ds T' '
81: .ds PI \(*p
82: 'br\}
83: .\" If the F register is turned on, we'll generate
84: .\" index entries out stderr for the following things:
85: .\" TH Title
86: .\" SH Header
87: .\" Sh Subsection
88: .\" Ip Item
89: .\" X<> Xref (embedded
90: .\" Of course, you have to process the output yourself
91: .\" in some meaninful fashion.
92: .if \nF \{
93: .de IX
94: .tm Index:\\$1\t\\n%\t"\\$2"
95: ..
96: .nr % 0
97: .rr F
98: .\}
99: .TH dhcping 8 "Januari 27, 2002" "Januari 27, 2002" "General Commands Manual"
100: .UC
101: .if n .hy 0
102: .if n .na
103: .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
104: .de CQ \" put $1 in typewriter font
105: .ft CW
106: 'if n "\c
107: 'if t \\&\\$1\c
108: 'if n \\&\\$1\c
109: 'if n \&"
110: \\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7
111: '.ft R
112: ..
113: .\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
114: . \" AM - accent mark definitions
115: .bd B 3
116: . \" fudge factors for nroff and troff
117: .if n \{\
118: . ds #H 0
119: . ds #V .8m
120: . ds #F .3m
121: . ds #[ \f1
122: . ds #] \fP
123: .\}
124: .if t \{\
125: . ds #H ((1u-(\\\\n(.fu%2u))*.13m)
126: . ds #V .6m
127: . ds #F 0
128: . ds #[ \&
129: . ds #] \&
130: .\}
131: . \" simple accents for nroff and troff
132: .if n \{\
133: . ds ' \&
134: . ds ` \&
135: . ds ^ \&
136: . ds , \&
137: . ds ~ ~
138: . ds ? ?
139: . ds ! !
140: . ds /
141: . ds q
142: .\}
143: .if t \{\
144: . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
145: . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
146: . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
147: . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
148: . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
149: . ds ? \s-2c\h'-\w'c'u*7/10'\u\h'\*(#H'\zi\d\s+2\h'\w'c'u*8/10'
150: . ds ! \s-2\(or\s+2\h'-\w'\(or'u'\v'-.8m'.\v'.8m'
151: . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
152: . ds q o\h'-\w'o'u*8/10'\s-4\v'.4m'\z\(*i\v'-.4m'\s+4\h'\w'o'u*8/10'
153: .\}
154: . \" troff and (daisy-wheel) nroff accents
155: .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
156: .ds 8 \h'\*(#H'\(*b\h'-\*(#H'
157: .ds v \\k:\h'-(\\n(.wu*9/10-\*(#H)'\v'-\*(#V'\*(#[\s-4v\s0\v'\*(#V'\h'|\\n:u'\*(#]
158: .ds _ \\k:\h'-(\\n(.wu*9/10-\*(#H+(\*(#F*2/3))'\v'-.4m'\z\(hy\v'.4m'\h'|\\n:u'
159: .ds . \\k:\h'-(\\n(.wu*8/10)'\v'\*(#V*4/10'\z.\v'-\*(#V*4/10'\h'|\\n:u'
160: .ds 3 \*(#[\v'.2m'\s-2\&3\s0\v'-.2m'\*(#]
161: .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
162: .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
163: .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
164: .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
165: .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
166: .ds ae a\h'-(\w'a'u*4/10)'e
167: .ds Ae A\h'-(\w'A'u*4/10)'E
168: .ds oe o\h'-(\w'o'u*4/10)'e
169: .ds Oe O\h'-(\w'O'u*4/10)'E
170: . \" corrections for vroff
171: .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
172: .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
173: . \" for low resolution devices (crt and lpr)
174: .if \n(.H>23 .if \n(.V>19 \
175: \{\
176: . ds : e
177: . ds 8 ss
178: . ds v \h'-1'\o'\(aa\(ga'
179: . ds _ \h'-1'^
180: . ds . \h'-1'.
181: . ds 3 3
182: . ds o a
183: . ds d- d\h'-1'\(ga
184: . ds D- D\h'-1'\(hy
185: . ds th \o'bp'
186: . ds Th \o'LP'
187: . ds ae ae
188: . ds Ae AE
189: . ds oe oe
190: . ds Oe OE
191: .\}
192: .rm #[ #] #H #V #F C
193: .SH "NAME"
194: \fBdhcping\fR \- send a DHCP request to DHCP server to see if it's up and running
195: .SH "SYNOPSIS"
196: \fBdhcping\fR
197: [\fB\-v\fR] [\fB\-q\fR] [\fB\-i\fR] [\fB\-r\fR]
198: \fB\-t\fR \fImaxwait\fR
199: \fB\-c\fR \fIclient-IP\-address\fR
200: \fB\-s\fR \fIserver-IP\-address\fR
201: \fB\-h\fR \fIclient-hardware-address\fR
202: [\fB\-g\fR \fIgateway-IP\-address\fR]
203: .SH "DESCRIPTION"
204: This command allows the system administrator to check if a remote
205: DHCP server is still functioning.
206: .PP
207: Options are:
208: .Ip "\fB\-v\fR" 5
209: Verbose, print some information.
210: .Ip "\fB\-i\fR" 5
211: Use \s-1DHCPINFORM\s0 packets.
212: .Ip "\fB\-r\fR" 5
213: Use \s-1DHCPREQUEST\s0 packets (default behaviour).
214: .Ip "\fB\-q\fR" 5
215: Quiet, print nothing on the screen.
216: .Ip "\fB\-t\fR \fImaxwait\fR" 5
217: Maximum time to wait for an answer from the server in seconds.
218: Default is 3 seconds.
219: .Ip "\fB\-c\fR \fIclient-\s-1IP\s0\-address\fR" 5
220: Request this \s-1IP\s0 address. Note that this is also the \s-1IP\s0 address the
221: answer will be sent to.
222: .Ip "\fB\-s\fR \fIserver-\s-1IP\s0\-address\fR" 5
223: Send the \s-1DHCP\s0 packet to this \s-1IP\s0 address.
224: .Ip "\fB\-h\fR \fIclient-hardware-address\fR" 5
225: Use this hardware-address in the \s-1DHCP\s0 request. It can be up to
226: sixteen octets seperated by colons (i.e. 01:02:03:04)
227: .Ip "\fB\-g\fR \fIgateway-\s-1IP\s0\-address\fR" 5
228: Use this \s-1IP\s0 address for the gateway \s-1IP\s0 address in the \s-1DHCP\s0 packet.
229: This option is currently broken.
230: .SH "RETURN VALUES"
231: If everything goes okay, it returns 0. If there went something
232: wrong, it returns 1.
233: .SH "SETUP"
234: This program should be installed setuid root or ran by root only.
235: See SECURITY for more information.
236: .PP
237: On your DHCP server, add these lines to the dhcpd.conf:
238: .PP
239: .Vb 4
240: \& host <your monitoring host FQDN> {
241: \& hardware ethernet <your monitor host mac address>;
242: \& fixed-address <your monitoring host IP address>;
243: \& }
244: .Ve
245: Then try it:
246: .PP
247: $ dhcping \-c \fIyour monitoring host IP address\fR \e
248: \-s \fIyour DHCP server IP address\fR \e
249: \-h \fIyour monitor host mac address\fR
250: .PP
251: It will either respond with \*(L"no answer\*(R" or \*(L"Got answer from: \fIyour
252: DHCP server IP address\fR\*(R"
253: .PP
254: The DHCP server logfile will give:
255: DHCPREQUEST\ for\ 192.168.1.1\ from\ 00:20:18:56:29:8f\ via\ ed0
256: DHCPACK\ on\ 192.168.1.1\ to\ 00:20:18:56:29:8f\ via\ ed0
257: DHCPRELEASE\ of\ 192.168.1.1\ from\ 00:20:18:56:29:8f\ via\ ed0\ (found)
258: .PP
259: Running in DHCPINFORM mode with \fB\-i\fR:
260: .PP
261: If you see \*(L"DHCPINFORM from 192.168.1.1 via xl0: not authoritative
262: for subnet 192.168.1.0\*(R", you should add the authoritative statement
263: to the subnet, See dhcpd.\fIconf\fR\|(5) for details.
264: .PP
265: When running in very verbose mode, \fBdhcping\fR tries to dump all
266: data of the send and received DHCP packets. It will first dump the
267: packet in hex-format, then decodes the header and finally the
268: options.
269: .SH "HOW IT WORKS"
270: The client either sends a DHCPREQUEST or DHCPINFORM packet to the
271: server and waits for an answer. Then, if a DHCPREQUEST was send,
272: it will send a DHCPRELEASE back to the server.
273: .SH "SECURITY"
274: This program is installed setuid root as it requires the privileges
275: to bind itself to port 68 (bootpc). Root privileges are dropped as
276: soon as the program has bound itself to that port.
277: .SH "BUGS"
278: Currently (this may, or may not, change in the future) the ISC DHCP
279: daemon does not write leases with a fixed IP address in the
280: dhcpd.leases file.
281: .PP
282: DHCPINFORM packets can only be used on subnets the server is authori-
283: tative for. If the monitoring script runs on a subnet the server
284: isn't authoritative for, it should use the DHCPREQUEST packets. I
285: also experienced some problems with ISC DHCPD v2 servers, but that
286: is also in the README of it.
287: .PP
288: The \fB\-V\fR option is still working, but shouldn't be used for
289: debugging of the packets. Better use \fIdhcpdump\fR\|(8) for that, which
290: is available on my website. I wanted to remove it, but decided only
291: to do it from the documentation, not from the code. Maybe I'll need
292: it one day for debugging.
293: .SH "AUTHOR"
294: Edwin Groothuis, edwin@mavetju.org (http://www.mavetju.org)
295: .SH "SEE ALSO"
296: \fIdhcpd\fR\|(8), \fIdhclient\fR\|(8), dhcpd.\fIconf\fR\|(5), \fIdhcpdump\fR\|(8)
297:
298: .rn }` ''
299: .IX Title "dhcping 8"
300: .IX Name "B<dhcping> - send a DHCP request to DHCP server to see if it's up and running"
301:
302: .IX Header "NAME"
303:
304: .IX Header "SYNOPSIS"
305:
306: .IX Header "DESCRIPTION"
307:
308: .IX Item "\fB\-v\fR"
309:
310: .IX Item "\fB\-i\fR"
311:
312: .IX Item "\fB\-r\fR"
313:
314: .IX Item "\fB\-q\fR"
315:
316: .IX Item "\fB\-t\fR \fImaxwait\fR"
317:
318: .IX Item "\fB\-c\fR \fIclient-\s-1IP\s0\-address\fR"
319:
320: .IX Item "\fB\-s\fR \fIserver-\s-1IP\s0\-address\fR"
321:
322: .IX Item "\fB\-h\fR \fIclient-hardware-address\fR"
323:
324: .IX Item "\fB\-g\fR \fIgateway-\s-1IP\s0\-address\fR"
325:
326: .IX Header "RETURN VALUES"
327:
328: .IX Header "SETUP"
329:
330: .IX Header "HOW IT WORKS"
331:
332: .IX Header "SECURITY"
333:
334: .IX Header "BUGS"
335:
336: .IX Header "AUTHOR"
337:
338: .IX Header "SEE ALSO"
339:
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