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