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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  TCP/IP Network Configuration and Management Protocols (BOOTP, DHCP, SNMP and RMON)
           9  Host Configuration and TCP/IP Host Configuration Protocols (BOOTP and DHCP)
                9  TCP/IP Dynamic Host Configuration Protocol (DHCP)
                     9  DHCP Messaging, Message Types and Formats

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DHCP Options, Option Format and "Option Overloading"
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DHCP Client/Server Implementation, Features and Issues
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Summary Of DHCP Options / BOOTP Vendor Information Fields
(Page 5 of 6)

Application and Service Parameters

These are miscellaneous options that control the operation of various applications and services (Table 197).


Table 197: DHCP/BOOTP Options: Application and Service Parameters

Code Value

Data Length (bytes)

Name and Description

40

Variable

Network Information Service Domain: Specifies the client's NIS domain. Contrast to option #64.

41

Variable (Multiple of 4)

Network Information Servers: Specifies a list of IP addresses of NIS servers the client may use. Servers are listed in the order of preference for the client to use. Contrast to option #65.

42

Variable (Multiple of 4)

Network Time Protocol Servers: Specifies a list of IP addresses of Network Time Protocol servers the client may use. Servers are listed in the order of preference for the client to use.

43

Variable

Vendor Specific Information: Allows an arbitrary set of vendor-specific information to be included as a single option within a DHCP or BOOTP message. This information is structured using the same format as the Options or Vend field itself, except that it does not start with a “magic cookie”. See the end of the previous topic for more details.

44

Variable (Multiple of 4)

NetBIOS Over TCP/IP Name Servers: Specifies a list of IP addresses of NetBIOS name servers (per RFC 1001/1002) that the client may use. Servers are listed in the order of preference for the client to use.

45

Variable (Multiple of 4)

NetBIOS Over TCP/IP Datagram Distribution Servers: Specifies a list of IP addresses of NetBIOS datagram distribution servers (per RFC 1001/1002) that the client may use. Servers are listed in the order of preference for the client to use.

46

1

 

47

Variable

NetBIOS Over TCP/IP Scope: Specifies the NetBIOS over TCP/IP scope parameter for the client.

48

Variable (Multiple of 4)

X Window System Font Servers: Specifies a list of IP addresses of X Window System Font servers that the client may use. Servers are listed in the order of preference for the client to use.

49

Variable (Multiple of 4)

X Window System Display Manager: Specifies a list of IP addresses of systems running the X Window System Display Manager that the client may use. Addresses are listed in the order of preference for the client to use.

64

Variable

Network Information Service+ Domain: Specifies the client's NIS+ domain. Contrast to option #40.

65

Variable (Multiple of 4)

Network Information Service+ Servers: Specifies a list of IP addresses of NIS+ servers the client may use. Servers are listed in the order of preference for the client to use. Contrast to option #41.

68

Variable (Multiple of 4)

Mobile IP Home Agent: Specifies a list of IP addresses of home agents that the client can use in Mobile IP. Agents are listed in the order of preference for the client to use; normally a single agent is specified.

69

Variable (Multiple of 4)

Simple Mail Transport Protocol (SMTP) Servers: Specifies a list of IP addresses of SMTP servers the client may use. Servers are listed in the order of preference for the client to use.

70

Variable (Multiple of 4)

Post Office Protocol (POP3) Servers: Specifies a list of IP addresses of POP3 servers the client may use. Servers are listed in the order of preference for the client to use.

71

Variable (Multiple of 4)

Network News Transfer Protocol (NNTP) Servers: Specifies a list of IP addresses of NNTP servers the client may use. Servers are listed in the order of preference for the client to use.

72

Variable (Multiple of 4)

Default World Wide Web (WWW) Servers: Specifies a list of IP addresses of World Wide Web (HTTP) servers the client may use. Servers are listed in the order of preference for the client to use.

73

Variable (Multiple of 4)

Default Finger Servers: Specifies a list of IP addresses of Finger servers the client may use. Servers are listed in the order of preference for the client to use.

74

Variable (Multiple of 4)

Default Internet Relay Chat (IRC) Servers: Specifies a list of IP addresses of Internet Relay Chat (IRC) servers the client may use. Servers are listed in the order of preference for the client to use.

75

Variable (Multiple of 4)

StreetTalk Servers: Specifies a list of IP addresses of StreetTalk servers the client may use. Servers are listed in the order of preference for the client to use.

76

Variable (Multiple of 4)

StreetTalk Directory Assistance (STDA) Servers: Specifies a list of IP addresses of STDA servers the client may use. Servers are listed in the order of preference for the client to use.


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DHCP Options, Option Format and "Option Overloading"
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DHCP Client/Server Implementation, Features and Issues
Next Topic/Section

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