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DHCP Options
DHCP provides a framework for passing configuration information to hosts on a TCP/IP network.
Configuration parameters and other control information are carried in tagged data items that are stored
in the options field of the DHCP message. The data items themselves are also called options.
This appendix contains DHCP options and BOOTP vendor extensions from RFC 2132, and includes the
validation type for each option, as indicated in
This appendix also contains the standard Microsoft client options and several tables displaying the
options sorted by categories.
Option Descriptions
The following sections describe the DHCP options in detail:
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RFC 1497 Vendor Extensions
Table B-1 on page B-2
OL-16002-01
RFC 1497 Vendor Extensions, page B-1
IP Layer Parameters Per Host, page B-3
IP Layer Parameters Per Interface, page B-4
Link Layer Parameters Per Interface, page B-4
TCP Parameters, page B-5
Application and Service Parameters, page B-5
DHCPv4 Extension Options, page B-8
DHCPv6 Options, page B-10
Microsoft Client Options, page B-13
Options by Number, page B-14
Options by Network Registrar Name, page B-18
Option Validation Types, page B-24
lists the vendor extensions as defined in RFC 1497.
A P P E N D I X
Table B-10 on page
B-14.
User Guide for Cisco Network Registrar, 7.1
B
B-1
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Summary of Contents for GE StoreSafe Pro Series
- Page 1 A P P E N D I X DHCP Options DHCP provides a framework for passing configuration information to hosts on a TCP/IP network. Configuration parameters and other control information are carried in tagged data items that are stored in the options field of the DHCP message. The data items themselves are also called options. This appendix contains DHCP options and BOOTP vendor extensions from RFC 2132, and includes the validation type for each option, as indicated in Table B-10 on page...
- Page 2 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Descriptions Table B-1 RFC 1497 Vendor Extension Options Option Name No. Length Description 1 octet Causes the subsequent fields to align on word boundaries. 255 1 octet End of valid information in the vendor field. Subsequent octets should be filled with the Pad options.
- Page 3 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Descriptions Table B-1 RFC 1497 Vendor Extension Options (continued) Option Name No. Length Description Root Path 1 octet minimum Path name that contains the client root disk. The path is formatted as a character string consisting of characters from the NVT ASCII character set.
- Page 4 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Descriptions IP Layer Parameters Per Interface Table B-3 lists the options that affect the operation of the IP layer on a per-interface basis. A client can issue multiple requests, one per interface, to configure interfaces with their specific parameters. Table B-3 IP Layer Parameters Per Interface Options Option Name...
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Page 5: Tcp Parameters
Part Appendices, Glossary, and Index Appendix B DHCP Options Option Descriptions Table B-4 Link Layer Parameters Per Interface Options (continued) Option Name No. Length Description ARP Cache 4 octets Timeout in seconds for ARP cache entries. Timeout Ethernet 1 octet Specifies whether or not the client should use Ethernet Version 2 (RFC Encapsulation 894) or IEEE 802.3 (RFC 1042) encapsulation if the interface is an... - Page 6 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Descriptions Table B-6 Application and Service Parameter Options (continued) Option Name No. Length Description Network Time 4 octet minimum; List of IP addresses indicating NTP servers that are Protocol Servers multiples of 4 available to the client.
- Page 7 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Descriptions Table B-6 Application and Service Parameter Options (continued) Option Name No. Length Description NetBIOS over 1 octet Allows NetBIOS over TCP/IP client, which are configured TCP/IP Node as described in RFC 1001/1002. Type Values: Single hexadecimal octet that identifies the client type:...
- Page 8 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Descriptions Table B-6 Application and Service Parameter Options (continued) Option Name No. Length Description Finger Server 4 octet minimum; List of Finger servers available to the client. Servers multiples of 4 should be in order of preference.
- Page 9 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Descriptions Table B-7 DHCPv4 Extensions (continued) Option Name No. Length Description Server Identifier 54 4 octets Used in DHCPOFFER and DHCPREQUEST messages, and can optionally be included in the DHCPACK and DHCPNAK messages.
- Page 10 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Descriptions Table B-7 DHCPv4 Extensions (continued) Option Name No. Length Description Client-Identifier 2 octet Used by DHCP clients to specify their unique identifier. DHCP minimum servers use this value to index their database of address bindings. This value is expected to be unique for all clients in an administrative domain.
- Page 11 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Descriptions Table B-8 DHCPv6 Options Network Registrar Name (Type) No. Description (Mod=modifiable) client-identifier DUID identifying a client between a client and a server. AT_BLOB server-identifier DUID identifying a server between a client and a server. AT_BLOB ia-na Nontemporary Addresses option with the associated parameters and...
- Page 12 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Descriptions Table B-8 DHCPv6 Options (continued) Network Registrar Name (Type) No. Description (Mod=modifiable) vendor-opts Clients and servers use this option to exchange vendor-specific AT_VENDOR_OPTS information. The enterprise ID for the CableLabs vendor is 4491; the suboptions for CableLabs are listed in Table C-4 on page C-7.
- Page 13 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Descriptions Table B-8 DHCPv6 Options (continued) Network Registrar Name (Type) No. Description (Mod=modifiable) geoconf-civic DHCP civic addresses configuration (Mod). AT_BLOB remote-id Relay agents that terminate switched or permanent circuits can add AT_BLOB this option to identify remote hosts (see RFC 4649) (Mod).
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Page 14: Option Tables
Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables Table B-9 Microsoft DHCP Client Options (continued) Option Name No. Description domain-name-servers 6 IP address of the name servers netbios-name-servers 44 WINS server address netbios-node-type Identifies the NetBIOS client type; note that Network Registrar displays a warning if it is not present routers IP address of the router for this subnet... - Page 15 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables Table B-10 DHCPv4 Options by Number (continued) No. Network Registrar Name Protocol Name Validation Comments lpr-servers LPR Server AT_IPADDR impress-servers Impress Server AT_IPADDR resource-location-servers RLP Server AT_IPADDR host-name Host Name AT_NSTRING boot-size Boot File Size...
- Page 16 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables Table B-10 DHCPv4 Options by Number (continued) No. Network Registrar Name Protocol Name Validation Comments netbios-name-servers NetBIOS Name Server AT_IPADDR netbios-dd-servers NetBIOS Distribution AT_IPADDR Server netbios-node-type NetBIOS Node Type AT_RANGEBYTE netbios-scope NetBIOS Scope...
- Page 17 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables Table B-10 DHCPv4 Options by Number (continued) No. Network Registrar Name Protocol Name Validation Comments streettalk-servers StreetTalk Server AT_IPADDR streettalk-directory- STDA Server AT_IPADDR assistance-servers dhcp-user-class-id User Class ID AT_TYPECNT Suboptions (2) slp-directory-agent Service Location...
- Page 18 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables Table B-10 DHCPv4 Options by Number (continued) No. Network Registrar Name Protocol Name Validation Comments 116 auto-configure Autoconfiguration AT_RANGEBYTE 117 name-service-search Name Service Search AT_SHORT 118 subnet-selection Subnet Selection AT_IPADDR 119 domain-search Domain Search...
- Page 19 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables Table B-11 DHCP Options by Network Registrar Name Network Registrar Name No. Option Name Category all-subnets-local All Subnets Are Local Interface arp-cache-timeout ARP Cache Timeout Interface associated-ip Lease Query Associated IP DHCPv4 auth Authentication...
- Page 20 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables Table B-11 DHCP Options by Network Registrar Name (continued) Network Registrar Name No. Option Name Category dhcp-max-message-size Maximum DHCP DHCPv4 Message Size dhcp-message-type DHCP Message Type DHCPv4 dhcp-message Message DHCPv4 dhcp-option-overload Option Overload...
- Page 21 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables Table B-11 DHCP Options by Network Registrar Name (continued) Network Registrar Name No. Option Name Category info-refresh-time Information Refresh Time DHCPv6 interface-id Interface Identifier DHCPv6 interface-mtu Interface MTU Interface ip-forwarding IP Forwarding Host IP...
- Page 22 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables Table B-11 DHCP Options by Network Registrar Name (continued) Network Registrar Name No. Option Name Category nis-domain NIS Domain Servers nis-domain-name NIS Domain Name DHCPv6 nis-servers Network Information Service Servers (NIS) Servers nis-servers...
- Page 23 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables Table B-11 DHCP Options by Network Registrar Name (continued) Network Registrar Name No. Option Name Category sip-servers-address SIP Servers IPv6 Address List DHCPv6 slp-directory agent SLP Directory Agent DHCPv4 slp-service-scope SLP Service Scope DHCPv4...
- Page 24 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables Option Validation Types Table B-12 defines the DHCP option validation types. Note that you cannot use some of them to define custom options. Table B-12 Validation Types Validation Description—Web UI Equivalent) AT_BLOB List of binary bytes—binary AT_BOOL...
- Page 25 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables Table B-12 Validation Types (continued) Validation Description—Web UI Equivalent) AT_TYPECNT Type requiring two child definition: size of the type field, and type of data—counted-type: For the DHCPv4 dhcp-user-class-id option (77), the repeating pattern is: [ len (1 byte) ] [ data, of single type ] For the DHCPv6 user-class option (15), the repeating pattern is: [ len (2 byte) ] [ data, of single type ]...
- Page 26 Part Appendices, Glossary, and Index Appendix B DHCP Options Option Tables User Guide for Cisco Network Registrar, 7.1 B-26 OL-16002-01...