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SunOS man pages : dhcp_inittab (4)

File Formats                                      dhcp_inittab(4)

NAME

dhcp_inittab - information repository for DHCP options

DESCRIPTION

The /etc/dhcp/inittab file contains information about the Dynamic Host Configuration Protocol (DHCP) options, which are network configuration parameters passed from DHCP servers to DHCP clients when a client machine uses DHCP. Since many DHCP-related commands must parse and understand these DHCP options, this file serves as a central location where information about these options may be obtained. The DHCP inittab file provides three general pieces of information: o A mnemonic alias, or symbol name, for each option number. For instance, option 12 is aliased to the name Hostname. This is useful for DHCP-related programs that require human interaction, such as dhcpinfo(1). o Information about the syntax for each option. This includes information such as the type of the value, for example, whether it is a 16-bit integer or an IP address. o The policy for what options are visible to which DHCP-related programs. The dhcp_inittab file can only be changed upon system upgrade. Only additions of SITE options (or changes to same) will be preserved during upgrade. The VENDOR options defined here are intended for use by the Solaris DHCP client and DHCP management tools. The SUNW ven- dor space is owned by Sun, and changes are likely during upgrade. If you need to configure the Solaris DHCP server to support the vendor options of a different client, see dhctab(4) for details. Each DHCP option belongs to a certain category, which roughly defines the scope of the option; for instance, an option may only be understood by certain hosts within a given site, or it may be globally understood by all DHCP clients and servers. The following categories are defined; the category names are not case-sensitive: STANDARD All client and server DHCP implementations agree on the semantics. These are administered by the Internet Assigned Numbers Authority (IANA). These options are numbered from 1 to 127. SunOS 5.8 Last change: 21 Mar 2001 1 File Formats dhcp_inittab(4) SITE Within a specific site, all client and server implementations agree on the semantics. However, at another site the type and meaning of the option may be quite different. These options are numbered from 128 to 254. VENDOR Each vendor may define 254 options unique to that vendor. The vendor is identified within a DHCP packet by the "Vendor Class" option, number 60. An option with a specific numeric identifier belonging to one vendor will, in general, have a type and semantics different from that of a dif- ferent vendor. Vendor options are "super- encapsulated" into the vendor field number 43, as defined in RFC 2132. The dhcp_inittab file only contains Sun vendor options. Define non-Sun ven- dor options in the dhcptab file. FIELD This category allows the fixed fields within a DHCP packet to be aliased to a mnemonic name for use with dhcpinfo(1). INTERNAL This category is internal to the Solaris DHCP implementation and will not be further defined. DHCP inittab Format Data entries are written one per line and have seven fields; each entry provides information for one option. Each field is separated by a comma, except for the first and second, which are separated by whitespace (as defined in isspace(3C)). An entry cannot be continued onto another line. Blank lines and those whose first non-whitespace char- acter is '#' are ignored. The fields, in order, are: o Mnemonic Identifier The Mnemonic Identifier is a user-friendly alias for the option number; it is not case sensitive. This field must be per-category unique and should be unique across all categories. The option names in the STANDARD, SITE, and VEN- DOR spaces should not overlap, or the behavior will be unde- fined. See Mnemonic Identifiers for Options section of this man page for descriptions of the option names. o Category (scope) SunOS 5.8 Last change: 21 Mar 2001 2 File Formats dhcp_inittab(4) The Category field is one of STANDARD, SITE, VENDOR, FIELD, or INTERNAL and identifies the scope in which the option falls. o Option Number The Option Number is the number of this option when it is in a DHCP packet. This field should be per-category unique and the STANDARD and SITE fields should not have overlapping code fields or the behavior is undefined. o Data Type Data Type is one of the following values, which are not case sensitive: Ascii A printable character string Octet An array of bytes Unumber8 An 8-bit unsigned integer Snumber8 An 8-bit signed integer Unumber16 A 16-bit unsigned integer Snumber16 A 16-bit signed integer Unumber32 A 32-bit unsigned integer Snumber32 A 32-bit signed integer Unumber64 A 64-bit unsigned integer Snumber64 A 64-bit signed integer Ip An IP address The data type field describes an indivisible unit of the option payload, using one of the values listed above. SunOS 5.8 Last change: 21 Mar 2001 3 File Formats dhcp_inittab(4) o Granularity The Granularity field describes how many "indivisible units" in the option payload make up a whole value or item for this option. o Maximum Number Of Items o Visibility The Visibility field specifies which DHCP-related programs make use of this information, and should always be defined as "sdmi" for newly added options. Mnemonic Identifiers for Options The following table maps the mnemonic identifiers used in Solaris DHCP to RFC-2132 options: Symbol Code Description Subnet 1 Subnet Mask, dotted Internet address (IP). UTCoffst 2 Coordinated Universal time offset (seconds). Router 3 List of Routers, IP. Timeserv 4 List of RFC-868 servers, IP. IEN116ns 5 List of IEN 116 name servers, IP. DNSserv 6 List of DNS name servers, IP. Logserv 7 List of MIT-LCS UDP log servers, IP. Cookie 8 List of RFC-865 cookie servers, IP. Lprserv 9 List of RFC-1179 line printer servers, IP. Impress 10 List of Imagen Impress servers, IP. Resource 11 List of RFC-887 resource location servers, IP. Hostname 12 Client's hostname, value from hosts database. Bootsize 13 Number of 512 octet blocks in boot image, NUMBER. Dumpfile 14 Path where core image should be dumped, ASCII. DNSdmain 15 DNS domain name, ASCII. Swapserv 16 Client's swap server, IP. Rootpath 17 Client's Root path, ASCII. ExtendP 18 Extensions path, ASCII. IpFwdF 19 IP Forwarding Enable/Disable, NUMBER. NLrouteF 20 Non-local Source Routing, NUMBER. PFilter 21 Policy Filter, IP. SunOS 5.8 Last change: 21 Mar 2001 4 File Formats dhcp_inittab(4) MaxIpSiz 22 Maximum datagram Reassembly Size, NUMBER. IpTTL 23 Default IP Time to Live, (1=<x<=255), NUMBER. PathTO 24 RFC-1191 Path MTU Aging Timeout, NUMBER. PathTbl 25 RFC-1191 Path MTU Plateau Table, NUMBER. MTU 26 Interface MTU, x>=68, NUMBER. SameMtuF 27 All Subnets are Local, NUMBER. Broadcst 28 Broadcast Address, IP. MaskDscF 29 Perform Mask Discovery, NUMBER. MaskSupF 30 Mask Supplier, NUMBER. RDiscvyF 31 Perform Router Discovery, NUMBER. RSolictS 32 Router Solicitation Address, IP. StaticRt 33 Static Route, Double IP (network router). TrailerF 34 Trailer Encapsulation, NUMBER. ArpTimeO 35 ARP Cache Time out, NUMBER. EthEncap 36 Ethernet Encapsulation, NUMBER. TcpTTL 37 TCP Default Time to Live, NUMBER. TcpKaInt 38 TCP Keepalive Interval, NUMBER. TcpKaGbF 39 TCP Keepalive Garbage, NUMBER. NISdmain 40 NIS Domain name, ASCII. NISservs 41 List of NIS servers, IP. NTPservs 42 List of NTP servers, IP. NetBNms 44 List of NetBIOS Name servers, IP. NetBDsts 45 List of NetBIOS Distribution servers, IP. NetBNdT 46 NetBIOS Node type (1=B-node, 2=P, 4=M, 8=H) NetBScop 47 NetBIOS scope, ASCII. XFontSrv 48 List of X Window Font servers, IP. XDispMgr 49 List of X Window Display managers, IP. LeaseTim 51 Lease Time Policy, (-1 = PERM), NUMBER. Message 56 Message to be displayed on client, ASCII. T1Time 58 Renewal (T1) time, NUMBER. T2Time 59 Rebinding (T2) time, NUMBER. NW_dmain 62 NetWare/IP Domain Name, ASCII. NWIPOpts 63 NetWare/IP Options, OCTET (unknown type). NIS+dom 64 NIS+ Domain name, ASCII. NIS+serv 65 NIS+ servers, IP. TFTPsrvN 66 TFTP server hostname, ASCII. OptBootF 67 Optional Bootfile path, ASCII. MblIPAgt 68 Mobile IP Home Agent, IP. SMTPserv 69 Simple Mail Transport Protocol Server, IP. SunOS 5.8 Last change: 21 Mar 2001 5 File Formats dhcp_inittab(4) POP3serv 70 Post Office Protocol (POP3) Server, IP. NNTPserv 71 Network News Transport Proto. (NNTP) Server, IP. WWWservs 72 Default WorldWideWeb Server, IP. Fingersv 73 Default Finger Server, IP. IRCservs 74 Internet Relay Chat Server, IP. STservs 75 StreetTalk Server, IP. STDAservs 76 StreetTalk Directory Assist. Server, IP. UserClas 77 User class information, ASCII. SLP_DA 78 Directory agent, OCTET. SLP_SS 79 Service scope, OCTET. AgentOpt 82 Agent circuit ID, OCTET. FQDN 89 Fully Qualified Domain Name, OCTET. PXEarch 93 Client system architecture, NUMBER. PXEnii 94 Client Network Device Interface, OCTET. PXEcid 97 UUID/GUID-based client indentifier, OCTET. BootFile N/A File to Boot, ASCII. BootPath N/A Boot path prefix to apply to client's requested boot file, ASCII. BootSrvA N/A Boot Server, IP. BootSrvN N/A Boot Server Hostname, ASCII. EchoVC N/A Echo Vendor Class Identifier Flag, (Present=TRUE) LeaseNeg N/A Lease is Negotiable Flag, (Present=TRUE) Include N/A Include listed macro values in this macro.

EXAMPLES

Example 1: Altering the DHCP inittab File In general, the DHCP inittab file should only be altered to add SITE options. If other options are added, they will not be automatically carried forward when the system is upgraded. For instance: ipPairs SITE, 132, IP, 2, 0, sdmi describes an option named ipPairs, that is in the SITE category. That is, it is defined by each individual site, and is option code 132, which is of type IP Address, con- sisting of a potentially infinite number of pairs of IP addresses.

FILES

/etc/dhcp/inittab SunOS 5.8 Last change: 21 Mar 2001 6 File Formats dhcp_inittab(4)

ATTRIBUTES

See attributes(5) for descriptions of the following attri- butes: ____________________________________________________________ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |_____________________________|_____________________________| | Availability | SUNWcsr | |_____________________________|_____________________________| | Interface Stability | Evolving | |_____________________________|_____________________________|

SEE ALSO

dhcpinfo(1),dhcpagent(1M), isspace(3C), dhctab(4), attributes(5) , dhcp(5), dhcp_modules(5) System Administration Guide, Volume 3 Alexander, S., and R. Droms, DHCP Options and BOOTP Vendor Extensions, RFC 2132, Network Working Group, March 1997. Droms, R., Dynamic Host Configuration Protocol, RFC 2131, Network Working Group, March 1997. SunOS 5.8 Last change: 21 Mar 2001 7