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Standard Options

The standard DHCP options are defined by a short name (or tag), which is a mnemonic. The names are listed below with their code number, name, data type, and description.


Code Name Type Description
1 Subnet IP Subnet mask, dotted Internet address
2 UTCoffst Number Coordinated universal Number offset (seconds)
3 Router IP List of routers
4 Timeserv IP List of RFC-868 servers
5 IEN116ns IP List of IEN-116 name servers
6 DNSservIP List of DNS name servers
7 Logserv IP List of MIT-LCS UDP log servers
8 Cookie IP List of RFC-865 cookie servers
9 Lprserv IP List of RFC-1179 line printer servers
10 Impress IP List of Imagen Impress servers
11 Resource IP List of RFC-887 resource location servers
12 Hostname Boolean Return client's host name, value from hosts database
13 Bootsize Number Number of 512 octet blocks in boot image
14 Dumpfile ASCII Path where core image should be dumped
15 DNSdmain ASCII DNS domain name
16 Swapserv IP Client's swap server
17 Rootpath ASCII Client's root path
18 ExtendP ASCII Extensions path
19 IpFwdF Number IP forwarding enable/disable (1/0)
20 NLrouteF Number Non-local source routing
21 PFilter IP Policy filter
22 MaxIpSiz Number Maximum datagram reassembly size
23 IpTTL Byte Default IP time to live (1=< x <=225)
24 PathTO Number RFC-1191 Path MTU aging timeout
25 PathTbl Number RFC-1191 Path MTU plateau table
26 MTU Number Interface MTU, (x <=68)
27 SameMtuF Number All subnets are local
28 Broadcst IP Broadcast address
29 MaskDscF Number Perform mask discovery
30 MaskSupF Number Mask supplier
31 RDiscvyF Number Perform route discovery
32 RSolictS IP Router solicitation address
33 StaticRt IP Static routes, double IP (network router)
34 TrailerF Number Trailer encapsulation
35 ArpTimeO Number Arp cache timeout
36 EthEncap Number Ethernet encapsulation
37 TcpTTL Number TCP default time to live
38 TcpKaInt Number TCP keep alive interval
39 TcpKaGbF Number Keep alive garbage
40 NISdmain ASCII NIS domain_ name
41 NISservs IP List of NIS servers
42 NTPservs IP List of NTP servers
44 NetBNms IP List of Netbios name servers
45 NetBDsts IP List of Netbios distribution servers
46 NetBNdT Number Netbios node type (1=B-node, 2=P, 4=M, 8=H)
47 NetBScop ASCII Netbios scope
48 XFontSrv IP List of X Window font servers
49 XDispMgr IP X Window display managers
51 LeaseTim Number Lease time policy
56 Message ASCII Message to be displayed on client
58 T1Time Number Renewal (T1) time
59 T2Time Number Rebinding (T2) time
62 NW_dmain ASCII Netware/IP domain name
63 NWIPOpts Octet Netware/IP options
64 NIS+dom ASCII NIS+ domain name
65 NIS+serv IP List of NIS+ servers
66 TFTPsrvN ASCII Trivial File Transfer Protocol (TFTP) server hostname
67 OptBootF ASCII Optional bootfile name
68 MblIPAgt IP Mobile IP home agents
69 SMTPserv IP Simple Mail Transport Protocol (SMTP) server
70 POP3serv IP Post Office Protocol (POP3) server
71 NNTPserv IP Network News Transport Protocol (NNTP) server
72 WWWservs IP Default World Wide Web server
73 Fingersv IP Default finger server
74 IRCservs IP Internet Relay Chat (IRC) server
75 STservs IP StreetTalk server
76 STDAservs IP StreetTalk directory assistance server
77 UserClas ASCII User class information
78 SLP_DA Octet Directory agent
79 SLP_SS Octet Service scope
82 AgentOpt Octet Agent circuit ID
89 FQDN Octet Fully Qualified Domain Name
93 PXEarch Number Client system architecture
94 PXEnii Octet Client Network Device Interface
97 PXEcid Octet UUID/GUID-based client identifier
N/A BootFile ASCII File to boot
N/A BootSrvA IP Boot server
N/A BootSrvN ASCII Boot server host name
NA LeaseNeg Boolean Lease is negotiable flag (present=true)
NA Include ASCII Include listed macro values in this macro

 

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