1dhcp_inittab(4) File Formats dhcp_inittab(4)
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6 dhcp_inittab - information repository for DHCP options
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9 The /etc/dhcp/inittab and the /etc/dhcp/inittab6 files contain informa‐
10 tion about the Dynamic Host Configuration Protocol (DHCP) options,
11 which are network configuration parameters passed from DHCP servers to
12 DHCP clients when a client machine uses DHCP. Since many DHCP-related
13 commands must parse and understand these DHCP options, this file serves
14 as a central location where information about these options may be
15 obtained.
16 The DHCP inittab and inittab6 files provide three general pieces of
19 information:
20 o A mnemonic alias, or symbol name, for each option number.
22 For instance, option 12 is aliased to the name Hostname.
23 This is useful for DHCP-related programs that require human
24 interaction, such as dhcpinfo(1).
25 o Information about the syntax for each option. This includes
27 information such as the type of the value, for example,
28 whether it is a 16-bit integer or an IP address.
29 o The policy for what options are visible to which DHCP-
31 related programs.
32 If you make any changes to the /etc/dhcp/inittab file, note that only
35 additions of or changes to SITE options are preserved during upgrade.
36 For /etc/dhcp/inittab6, no options are preserved during upgrade.
37 The VENDOR options defined here are intended for use by the Solaris
40 DHCP client and DHCP management tools. The SUNW vendor space is owned
41 by Sun, and changes are likely during upgrade. If you need to configure
42 the Solaris DHCP server to support the vendor options of a different
43 client, see dhcptab(4) for details.
44 Each DHCP option belongs to a certain category, which roughly defines
47 the scope of the option; for instance, an option may only be understood
48 by certain hosts within a given site, or it may be globally understood
49 by all DHCP clients and servers. The following categories are defined;
50 the category names are not case-sensitive:
51 STANDARD All client and server DHCP implementations agree on the
53 semantics. These are administered by the Internet Assigned
54 Numbers Authority (IANA). These options are numbered from 1
55 to 127 for IPv4 DHCP, and 1 to 65535 for DHCPv6.
56 SITE Within a specific site, all client and server implementa‐
59 tions agree on the semantics. However, at another site the
60 type and meaning of the option may be quite different.
61 These options are numbered from 128 to 254 for IPv4 DHCP.
62 DHCPv6 does not support site options.
63 VENDOR Each vendor may define 254 options (65536 for DHCPv6)
66 unique to that vendor. The vendor is identified within a
67 DHCP packet by the "Vendor Class" option, number 60 (number
68 17 for DHCPv6). An option with a specific numeric identi‐
69 fier belonging to one vendor will, in general, have a type
70 and semantics different from that of a different vendor.
71 Vendor options are "super-encapsulated" into the vendor
72 field number 43, as defined in RFC 2132 for IPv4 DHCP, and
73 number 17 as defined in RFC 3315 for DHCPv6. The
74 /etc/dhcp/inittab file contains only Sun vendor options.
75 Define non-Sun vendor options in the dhcptab file.
76 FIELD This category allows the fixed fields within a DHCP packet
79 to be aliased to a mnemonic name for use with dhcpinfo(1).
80 INTERNAL This category is internal to the Solaris DHCP implementa‐
83 tion and will not be further defined.
84 DHCP inittab and inittab6 Format
87 Data entries are written one per line and have seven fields; each entry
88 provides information for one option. Each field is separated by a
89 comma, except for the first and second, which are separated by white‐
90 space (as defined in isspace(3C)). An entry cannot be continued onto
91 another line. Blank lines and those whose first non-whitespace charac‐
92 ter is '#' are ignored.
93 The fields, in order, are:
96 o Mnemonic Identifier
98 The Mnemonic Identifier is a user-friendly alias for the
100 option number; it is not case sensitive. This field must be
101 per-category unique and should be unique across all cate‐
102 gories. The option names in the STANDARD, SITE, and VENDOR
103 spaces should not overlap, or the behavior will be unde‐
104 fined. See Mnemonic Identifiers for Options section of this
105 man page for descriptions of the option names.
106 o Category (scope)
108 The Category field is one of STANDARD, SITE, VENDOR, FIELD,
110 or INTERNAL and identifies the scope in which the option
111 falls. SITE is not used in inittab6.
112 o Option Number
114 The Option Number is the number of this option when it is in
116 a DHCP packet. This field should be per-category unique and
117 the STANDARD and SITE fields should not have overlapping
118 code fields or the behavior is undefined.
119 o Data Type
121 Data Type is one of the following values, which are not case
123 sensitive:
124 Ascii A printable character string
127 Bool Has no value. Scope limited to category limited
130 to INTERNAL. Presence of an option of this type
131 within a Solaris configuration file represents
132 TRUE, absence represents FALSE.
133 Octet An array of bytes
136 Unumber8 An 8-bit unsigned integer
139 Snumber8 An 8-bit signed integer
142 Unumber16 A 16-bit unsigned integer
145 Snumber16 A 16-bit signed integer
148 Unumber24 A 24-bit unsigned integer
151 Unumber32 A 32-bit unsigned integer
154 Snumber32 A 32-bit signed integer
157 Unumber64 A 64-bit unsigned integer
160 Snumber64 A 64-bit signed integer
163 Ip An IPv4 address
166 Ipv6 An IPv6 address
169 Duid An RFC 3315 Unique Identifier
172 Domain An RFC 1035-encoded domain name
175 The data type field describes an indivisible unit of the option
178 payload, using one of the values listed above.
179 o Granularity
181 The Granularity field describes how many indivisible units
183 in the option payload make up a whole value or item for this
184 option. The value must be greater than zero (0) for any data
185 type other than Bool, in which case it must be zero (0).
186 o Maximum Number Of Items
188 This value specifies the maximum items of Granularity which
190 are permissible in a definition using this symbol. For exam‐
191 ple, there can only be one IP address specified for a
192 subnet mask, so the Maximum number of items in
193 this case is one (1). A Maximum value of zero (0) means
194 that a variable number of items is permitted.
195 o Visibility
197 The Visibility field specifies which DHCP-related programs
199 make use of this information, and should always be defined
200 as sdmi for newly added options.
201 Mnemonic Identifiers for IPv4 Options
203 The following table maps the mnemonic identifiers used in Solaris DHCP
204 to RFC 2132 options:
205 Symbol Code Description
210 ────────────────────────────────────────────────────────────────────────
211 Subnet 1 Subnet Mask, dotted Internet address
212 (IP).
213 UTCoffst 2 Coordinated Universal time offset (sec‐
214 onds).
215 Router 3 List of Routers, IP.
216 Timeserv 4 List of RFC-868 servers, IP.
217 IEN116ns 5 List of IEN 116 name servers, IP.
218 DNSserv 6 List of DNS name servers, IP.
219 Logserv 7 List of MIT-LCS UDP log servers, IP.
220 Cookie 8 List of RFC-865 cookie servers, IP.
221 Lprserv 9 List of RFC-1179 line printer servers,
222 IP.
223 Impress 10 List of Imagen Impress servers, IP.
224 Resource 11 List of RFC-887 resource location
225 servers, IP.
226 Hostname 12 Client's hostname, value from hosts
227 database.
228 Bootsize 13 Number of 512 octet blocks in boot
229 image, NUMBER.
230 Dumpfile 14 Path where core image should be dumped,
231 ASCII.
232 DNSdmain 15 DNS domain name, ASCII.
233 Swapserv 16 Client's swap server, IP.
234 Rootpath 17 Client's Root path, ASCII.
235 ExtendP 18 Extensions path, ASCII.
236 IpFwdF 19 IP Forwarding Enable/Disable, NUMBER.
237 NLrouteF 20 Non-local Source Routing, NUMBER.
238 PFilter 21 Policy Filter, IP.
239 MaxIpSiz 22 Maximum datagram Reassembly Size, NUM‐
240 BER.
241 IpTTL 23 Default IP Time to Live, (1=<x<=255),
242 NUMBER.
243 PathTO 24 RFC-1191 Path MTU Aging Timeout, NUMBER.
244 PathTbl 25 RFC-1191 Path MTU Plateau Table, NUMBER.
245 MTU 26 Interface MTU, x>=68, NUMBER.
246 SameMtuF 27 All Subnets are Local, NUMBER.
247 Broadcst 28 Broadcast Address, IP.
248 MaskDscF 29 Perform Mask Discovery, NUMBER.
249 MaskSupF 30 Mask Supplier, NUMBER.
250 RDiscvyF 31 Perform Router Discovery, NUMBER.
251 RSolictS 32 Router Solicitation Address, IP.
252 StaticRt 33 Static Route, Double IP (network
253 router).
254 TrailerF 34 Trailer Encapsulation, NUMBER.
255 ArpTimeO 35 ARP Cache Time out, NUMBER.
256 EthEncap 36 Ethernet Encapsulation, NUMBER.
257 TcpTTL 37 TCP Default Time to Live, NUMBER.
258 TcpKaInt 38 TCP Keepalive Interval, NUMBER.
259 TcpKaGbF 39 TCP Keepalive Garbage, NUMBER.
260 NISdmain 40 NIS Domain name, ASCII.
261 NISservs 41 List of NIS servers, IP.
262 NTPservs 42 List of NTP servers, IP.
263 NetBNms 44 List of NetBIOS Name servers, IP.
264 NetBDsts 45 List of NetBIOS Distribution servers,
265 IP.
266 NetBNdT 46 NetBIOS Node type (1=B-node, 2=P, 4=M,
267 8=H).
268 NetBScop 47 NetBIOS scope, ASCII.
270 XFontSrv 48 List of X Window Font servers, IP.
271 XDispMgr 49 List of X Window Display managers, IP.
272 LeaseTim 51 Lease Time Policy, (-1 = PERM), NUMBER.
273 Message 56 Message to be displayed on client,
274 ASCII.
275 T1Time 58 Renewal (T1) time, NUMBER.
276 T2Time 59 Rebinding (T2) time, NUMBER.
277 NW_dmain 62 NetWare/IP Domain Name, ASCII.
278 NWIPOpts 63 NetWare/IP Options, OCTET (unknown
279 type).
280 NIS+dom 64 NIS+ Domain name, ASCII.
281 NIS+serv 65 NIS+ servers, IP.
282 TFTPsrvN 66 TFTP server hostname, ASCII.
283 OptBootF 67 Optional Bootfile path, ASCII.
284 MblIPAgt 68 Mobile IP Home Agent, IP.
285 SMTPserv 69 Simple Mail Transport Protocol Server,
286 IP.
287 POP3serv 70 Post Office Protocol (POP3) Server, IP.
288 NNTPserv 71 Network News Transport Proto. (NNTP)
289 Server, IP.
290 WWWservs 72 Default WorldWideWeb Server, IP.
291 Fingersv 73 Default Finger Server, IP.
292 IRCservs 74 Internet Relay Chat Server, IP.
293 STservs 75 StreetTalk Server, IP.
294 STDAservs 76 StreetTalk Directory Assist. Server, IP.
295 UserClas 77 User class information, ASCII.
296 SLP_DA 78 Directory agent, OCTET.
297 SLP_SS 79 Service scope, OCTET.
298 AgentOpt 82 Agent circuit ID, OCTET.
299 FQDN 89 Fully Qualified Domain Name, OCTET.
300 PXEarch 93 Client system architecture, NUMBER.
301 BootFile N/A File to Boot, ASCII.
302 BootPath N/A Boot path prefix to apply to client's
303 requested boot file, ASCII.
304 BootSrvA N/A Boot Server, IP.
305 BootSrvN N/A Boot Server Hostname, ASCII.
306 EchoVC N/A Echo Vendor Class Identifier Flag,
307 (Present=TRUE)
308 LeaseNeg N/A Lease is Negotiable Flag, (Present=TRUE)
309 Mnemonic Identifiers for IPv6 Options
312 The following table maps the mnemonic identifiers used in Solaris DHCP
313 to RFC 3315, 3319, 3646, 3898, 4075, and 4280 options:
314 Symbol Code Description
319 ───────────────────────────────────────────────────────────────────
320 ClientID 1 Unique identifier for client, DUID
321 ServerID 2 Unique identifier for server, DUID
322 Preference 7 Server preference, NUMBER
323 Unicast 12 Unicast server address, IPV6
324 UserClass 15 User classes for client, OCTET
325 VendorClass 16 Vendor client hardware items, OCTET
326 SIPNames 21 SIP proxy server name list, DOMAIN
327 SIPAddresses 22 SIP proxy server addresses in pref‐
328 erence order, IPV6
329 DNSAddresses 23 DNS server addresses in preference
330 order, IPV6
331 DNSSearch 24 DNS search list, DOMAIN
332 NISServers 27 NIS server addresses in preference
333 order, IPV6
334 NIS+Servers 28 NIS+ server addresses in preference
337 order, IPV6
338 NISDomain 29 NIS domain name, DOMAIN
339 NIS+Domain 30 NIS+ domain name, DOMAIN
340 SNTPServers 31 IPV6
341 InfoRefresh 32 UNUMBER32
342 BCMCDomain 33 Broadcast/multicast control server
343 name list, DOMAIN
344 BCMCAddresses 34 Broadcast/multicast control server
345 addresses, IPV6
346
349 Example 1 Altering the DHCP inittab File
350 In general, the DHCP inittab file should only be altered to add SITE
353 options. If other options are added, they will not be automatically
354 carried forward when the system is upgraded. For instance:
355 ipPairs SITE, 132, IP, 2, 0, sdmi
358 describes an option named ipPairs, that is in the SITE category. That
362 is, it is defined by each individual site, and is option code 132,
363 which is of type IP Address, consisting of a potentially infinite num‐
364 ber of pairs of IP addresses.
365
368 /etc/dhcp/inittab
369 /etc/dhcp/inittabv6
370
372 See attributes(5) for descriptions of the following attributes:
373 ┌─────────────────────────────┬─────────────────────────────┐
378 │ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
379 ├─────────────────────────────┼─────────────────────────────┤
380 │Availability │SUNWcsr │
381 ├─────────────────────────────┼─────────────────────────────┤
382 │Interface Stability │Committed │
383 └─────────────────────────────┴─────────────────────────────┘
384
386 dhcpinfo(1),dhcpagent(1M), isspace(3C), dhcptab(4), attributes(5),
387 dhcp(5), dhcp_modules(5)
388 System Administration Guide: IP Services
391 Alexander, S., and R. Droms. RFC 2132, DHCP Options and BOOTP Vendor
394 Extensions. Network Working Group. March 1997.
395 Droms, R. RFC 2131, Dynamic Host Configuration Protocol. Network Work‐
398 ing Group. March 1997.
399 Droms, R. RFC 3315, Dynamic Host Configuration Protocol for IPv6
402 (DHCPv6). Cisco Systems. July 2003.
403 Schulzrinne, H., and B. Volz. RFC 3319, Dynamic Host Configuration Pro‐
406 tocol (DHCPv6) Options for Session Initiation Protocol (SIP) Servers.
407 Columbia University and Ericsson. July 2003.
408 Droms, R. RFC 3646, DNS Configuration options for Dynamic Host Configu‐
411 ration Protocol for IPv6 (DHCPv6). Cisco Systems. December 2003.
412 Kalusivalingam, V. RFC 3898, Network Information Service (NIS) Configu‐
415 ration Options for Dynamic Host Configuration Protocol for IPv6
416 (DHCPv6). Cisco Systems. October 2004.
417 Chowdhury, K., P. Yegani, and L. Madour. RFC 4280, Dynamic Host Config‐
420 uration Protocol (DHCP) Options for Broadcast and Multicast Control
421 Servers. Starent Networks, Cisco Systems, and Ericsson. November 2005.
422 Mockapetris, P.V. RFC 1035, Domain names - implementation and specifi‐
425 cation. ISI. November 1987.
426SunOS 5.11 31 Aug 2009 dhcp_inittab(4)