DHCPv4 Option Summary


Option Name
Code
ISC Option Name
Microsoft Option Name
Descritpion
All subnets are local
27
all-subnets-local
All subnets are local
0 specifies that the client should assume that some IP subnets have smaller MTUs; 1 specifies that all subnets have same MTU as subnet to which the client is connected.
ARP cache timeout
35
arp-cache-timeout
ARP cache Timeout
Timeout (in seconds) for ARP cache entries
Autoconfiguration
116
autoconfiguration

0 specifies that the client should not perform link-local IP address autoconfiguration; 1 specifies that the client should perform autoconfiguration
Boot file size
13
boot-size
Boot file size
Size of the client bootfile in 512-byte blocks
Boot file name
67
bootfile-name
Boot file name
Name of the bootfile to use when the file field is used to carry options
Broadcast address
28
Broadcast-address
Broadcast address
The broadcast address for the subnet to which the client is attached.
Client identifier
61
Dhcp-client-identifier
Client’s unique identifier

Cookie server
8
Cookie-servers
Cookie servers
Cookie servers
Default IP TTL
23
Default-ip-ttl
Default Time-to-Live
Default TTL client should use for outgoing  datagrams
Dhcp authentication option
90
authentication

Option used to authenticate DHCP packets transmitted by client and servers
DHCP message type
53
Dhcp-message-type

Identifies the type of the DHCP message
Domain name servers
6
Domain-name-servers
Dns server
List of DNS server IP addresses
Domain name
15
Domain-name
Domain name
Default name for DNS name resolution.
End 
255
Option-end

Indicates end of options in field
Ethernet encapsulation
36
Ieee802-3-encapsulation
Ethernet encapsulation
0 specifies Ethernet version 2 encapsulation; 1 specifies IEEE 802.3
Extensions path
18
Extensions-path
Extensions path
The name of the file containing additional options to be interpreted according to RFC2132 format
Finger server
73
Finger-server
Finger servers
List of finger server IP addresses
Host name
12
Host-name
Host name
Client hostname
Impress server
10
Impress-servers
Impress servers
Imagen impress printer servers
Interface MTU
26
Interface-mtu
MTU option
Value of MTU that the client should use for this interface
Length of DHCP lease
51
Dhcp-lease-time

Lease duration (expressed in seconds) for the assigned IP address
IP forwarding
19
Ip-forwarding
IP Layer Forwarding
0 specifies that datagram forwarding between interfaces is to be disabled; 1 specifies that forwarding is to be enabled
IRC Server
74
Irc-server
Internet relay chat (IRC) servers
List of internet relay chat server IP address
Log server
7
Log-servers
Log servers
MIT-LCS log servers
LPR server
9
Lpr-servers
LPR Servers
LPDP servers
Mask supplier
30
Mask-supplier
Mask Supplier Option
0 specifies that the client should not respond to ICMP subnet mask request messages; 1 specifies that the client should respond.
Maximum datagram
22
Max-dgram-reassembly
Max DG Reassembly Size
Maximum size of datagram that reassembly the client should expect to reassemble
Maximum DHCP
57
Dhcp-max-message-size

Maximum DHCP message size message size accepted by the client
Merit dump file
14
Merit-dump
Merit dump file
Name of file for memory dump
Message
56
Dhcp-message

Message from the server to be displayed to the user by the client
Mobile IP home agents
68
Mobile-ip-home-agents
Mobile IP home agents
List of mobile IP home agents
Name server
5
Ien116-name-servers
Name Servers
IEN 116 name servers
Name Service
117
Name-service-search-order

Ordered list of name service types that the client should use initial netware directory server (NDS) for client
NDS Server
85
Nds-servers

List of NDS servers
NDS tree name
86
Nds-tree-name

NDS tree name for the client to use.
NetBIOS over TCP/IP
45
Netbios-dd-server
NetBIOS over TCP/IP NBDD
List of NetBIOS Datagram data-Distribution(NBDD) servers
NetBIOS over TCP/IP name server
44
Netbios-name-servers
WINS/NBNS servers
List of NetBIOS Name Server(NBNS) IP addresses.

Option Name
Code
ISC Option Name
Microsoft Option Name
Descritpion
NetBIOS over TCP/IP type
46
Netbios-node-type
WINS/NBT type
Client’s NetBIOS over TCP/IP node
NetBIOS over TCP/IP scope
47
Netbios-scope
NetBIOS scope ID
Client’s NetBIOS over TCP/IP scope
NetWare/IP domain
62
Nwip-domain

Name of NetWare/IP domain for client
NetWare/IP information
63
Nwip.nsq-broadcast nwip.preferred-dss nwip.nearest-nwip-server nwip.autoretries nwip.autoretry-secs nwip.nwip-1-1 nwip.primary-dss

NetWare/IP parameters
NIS domain Name
40
Nis-domain
NIS Domain Name
Client’s Network Information Service (NIS) domain
NIS Servers
41
Nis-servers
NIS Servers
List of NIS servers
NIS+ domain Name
64
Nisplus-domain
NIS+ Domain Name
Client’s Network information Server+(NIS+) domain
NIS+ servers
65
Nisplus-servers
Nis+ servers
List of NIS+ server IP addresses
NNTP server
71
nntp-server
Network News Transport Protocol (NNTP) servers
List of NNTP servers
Non-local source routing
20
Non-local-source-routing
Non-local source routing
0 specifies that forwarding of datagrams with nonlocal source routes is to be disallowed; 1 specifies that forwarding of sub datagrams is to be allowed
NTP servers
42
Ntp-servers
NTP server
Lsit of network Time Protocol (NTP) servers
Option overload
52
Dhcp-option-overload

Specifies whether file and sname fields are used to carry options
Pad
0
Pad

Carries no data
Parameters request list
55
Dhcp-parameter-request-list

List of options requested by the client
Path MTU aging
24
Path-mtu-aging-seconds
Path MTU Aging Timeout
Timeout(in seconds) for aging PMTU values
Path MTU plateau table
25
Path-mtu-plateau-table
Path MTU Plateau Table
List of MTU sizes for PMTU discovery.
Perform mask discovery
29
Perform-mask-discovery
Perform mask discovery
0 specifies that the client should not perform ICMP subnet mask discovery; 1 specifies that the client should perform subnet mask discovery
Policy filter
21
Policy-filter
Policy Filter Masks
List of policy filters for nonlocal source routing.
POP3 server
70
Pop-server (pop3) server IP
Post office protocol (pop3) servers
List of post office protocol 3 addresses
Requested IP address
50
Dhcp-requested-address

IP address requested by the client.
Relay agent information the relay option
82
Relay-agent-information

Additional information supplied by agent
Resource location servers
11
Resource-location-servers servers
Resource location servers
Resource location protocol
Root path
17
Root-path
Root path
Name of the client’s root disk.
Router solicitation for router
32
Router-solicitation-address
Router solicitation
The address the client should use address discovery
Routers
3
routers
router
IP addresses of default routers to use on the client’s network segment
Server identifier
54
Dhcp-server-identifier

The IP address of the DHCP server
SLP Directory Agent
78
Slp-directory-agent

The service location Protocol service scope
SMTP server
69
Smtp-server
Simple mail transport protocol (SMTP) servers
List of simple mail transport protocol (SMTP) servers
Static route
33
Static-routes
Static route option
List of static routes; each static route includes a destination
Streettalk directory assistance server
76
Streettalk-directory-assistance -server
Streettalk directory assistance (STDA) servers
List of STDA servers
Subnet mask
1
Subnet-mask

The subnet mask for the network segment to which the client is connected.
Subnet selection option
118
Subnet-selection

The subnet number to use in selecting the client IP address.
Swap server
16
Swap-server
Swap server
The swap server for the client
T1
58
Dhcp-renewal-time

The time, in seconds ,until the client should renew the lease on the assigned address.
T2
59
Dhcp-rebinding-time

The time, in seconds, until the client should rebind the lease on the assigned address.
TCP default TTL
37
Default-tcp-ttl
Default TTL option
The default TTL for TCP segments
TCP keepalive garbage
39
Tcp-keepalive-garbage
Keepalive Garbage
0 specifies that the client should not send a garbage byte with a TCP keepalive message; 1 specifies that the client should send a garbage byte
TCP keepalive interval
38
Tcp-keepalive-interval
Keepalive interval
The time, in seconds, to wait before sending a keepalive message on a TCP connection
TFTP server name
66
Tftp-server-name
Boot server Host name
The name of the TFTP serve r to use when the Sname field is used to carry options
Time offset
2
Time-offset
Time offset
The time offset, in seconds, from coordinated universal time (UTC) for the client’s network segment
Time server
4
Time-servers
Time server
The time server’s IP addresses
Trailer
34
Trailer-encapsulation
Trailer encapsulation
0 specifies that the client should not negotiate the use of trailers through ARP; 1 specifies that the client should negotiate the use of trailers.
UAP servers
98
Uap-servers

List of URLs specifying User authentication protocol servers
User class
77
User class

User class information
Vendor class identifier
60
Vendor-class-identifier

Vendor identification
Vendor specific information
43
Vendor-encapsulated-options
Vendor specific info
Vendor-specific information
WWW server
72
www-server
World wide web(WWW) servers
List of world web server IP addresses
X window system display managers
49
x-display-managers
X window system display
List of X window system display manager
X window system font server
48
Font-servers
X window system font
List of x window system font servers

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