Tag |
Name |
Meaning |
ISC dhcp option |
Length |
Reference |
0 |
Pad |
None |
pad |
0 |
[RFC2132] |
1 |
Subnet Mask |
Subnet Mask Value |
subnet-mask |
4 |
[RFC2132] |
2 |
Time Offset |
Time Offset in Seconds from UTC (note: deprecated by 100 and 101) |
time-offset |
4 |
[RFC2132],[RFC4833] |
3 |
Router |
Router addresses |
routers |
N/4 |
[RFC2132] |
4 |
Time Server |
Timeserver addresses |
time-servers |
N |
[RFC2132] |
5 |
Name Server |
IEN-116 Server addresses |
ien116-name-servers |
N |
[RFC2132] |
6 |
Domain Server |
DNS Server addresses |
domain-name-servers |
N |
[RFC2132] |
7 |
Log Server |
Logging Server addresses |
log-servers |
N |
[RFC2132] |
8 |
Quotes Server |
Quotes Server addresses |
cookie-servers |
N |
[RFC2132] |
9 |
LPR Server |
Printer Server addresses |
lpr-servers |
N |
[RFC2132] |
10 |
Impress Server |
Impress Server addresses |
impress-servers |
N |
[RFC2132] |
11 |
RLP Server |
RLP Server addresses |
resource-location-servers |
N |
[RFC2132] |
12 |
Hostname |
Hostname string |
host-name |
N |
[RFC2132] |
13 |
Boot File Size |
Size of boot file in 512 byte chunks |
boot-size |
2 |
[RFC2132] |
14 |
Merit Dump File |
Client to dump and name the file to dump it to |
merit-dump |
N |
[RFC2132] |
15 |
Domain Name |
The DNS domain name of the client |
domain-name |
N |
[RFC2132] |
16 |
Swap Server |
Swap Server addeess |
swap-server |
N |
[RFC2132] |
17 |
Root Path |
Path name for root disk |
root-path |
N |
[RFC2132] |
18 |
Extension File |
Path name for more BOOTP info |
extensions-path |
N |
[RFC2132] |
19 |
Forward On/Off |
Enable/Disable IP Forwarding |
ip-forwarding |
1 |
[RFC2132] |
20 |
SrcRte On/Off |
Enable/Disable Source Routing |
non-local-source-routing |
1 |
[RFC2132] |
21 |
Policy Filter |
Routing Policy Filters |
policy-filter |
N |
[RFC2132] |
22 |
Max DG Assembly |
Max Datagram Reassembly Size |
max-dgram-reassembly |
2 |
[RFC2132] |
23 |
Default IP TTL |
Default IP Time to Live |
default-ip-ttl |
1 |
[RFC2132] |
24 |
MTU Timeout |
Path MTU Aging Timeout |
path-mtu-aging-timeout |
4 |
[RFC2132] |
25 |
MTU Plateau |
Path MTU Plateau Table |
path-mtu-plateau-table |
N |
[RFC2132] |
26 |
MTU Interface |
Interface MTU Size |
interface-mtu |
2 |
[RFC2132] |
27 |
MTU Subnet |
All Subnets are Local |
all-subnets-local |
1 |
[RFC2132] |
28 |
Broadcast Address |
Broadcast Address |
broadcast-address |
4 |
[RFC2132] |
29 |
Mask Discovery |
Perform Mask Discovery |
perform-mask-discovery |
1 |
[RFC2132] |
30 |
Mask Supplier |
Provide Mask to Others |
mask-supplier |
1 |
[RFC2132] |
31 |
Router Discovery |
Perform Router Discovery |
router-discovery |
1 |
[RFC2132] |
32 |
Router Request |
Router Solicitation Address |
router-solicitation-address |
4 |
[RFC2132] |
33 |
Static Route |
Static Routing Table |
static-routes |
N |
[RFC2132] |
34 |
Trailers |
Trailer Encapsulation |
trailer-encapsulation |
1 |
[RFC2132] |
35 |
ARP Timeout |
ARP Cache Timeout |
arp-cache-timeout |
4 |
[RFC2132] |
36 |
Ethernet |
Ethernet Encapsulation |
ieee802-3-encapsulation |
1 |
[RFC2132] |
37 |
Default TCP TTL |
Default TCP Time to Live |
default-tcp-ttl |
1 |
[RFC2132] |
38 |
Keepalive Time |
TCP Keepalive Interval |
tcp-keepalive-interval |
4 |
[RFC2132] |
39 |
Keepalive Data |
TCP Keepalive Garbage |
tcp-keepalive-garbage |
1 |
[RFC2132] |
40 |
NIS Domain |
NIS Domain Name |
nis-domain |
N |
[RFC2132] |
41 |
NIS Servers |
NIS Server Addresses |
nis-servers |
N |
[RFC2132] |
42 |
NTP Servers |
NTP Server Addresses |
ntp-servers |
N |
[RFC2132] |
43 |
Vendor Specific |
Vendor Specific Information |
vendor-encapsulated-options |
N |
[RFC2132] |
44 |
NETBIOS Name Srv |
NETBIOS Name Servers |
netbios-name-servers |
N |
[RFC2132] |
45 |
NETBIOS Dist Srv |
NETBIOS Datagram Distribution |
netbios-dd-server |
N |
[RFC2132] |
46 |
NETBIOS Node Type |
NETBIOS Node Type |
netbios-node-type |
1 |
[RFC2132] |
47 |
NETBIOS Scope |
NETBIOS Scope |
netbios-scope |
N |
[RFC2132] |
48 |
X Window Font |
X Window Font Server |
font-servers |
N |
[RFC2132] |
49 |
X Window Manager |
X Window Display Manager |
x-display-manager |
N |
[RFC2132] |
50 |
Address Request |
Requested IP Address |
dhcp-requested-address |
4 |
[RFC2132] |
51 |
Address Time |
IP Address Lease Time |
dhcp-lease-time |
4 |
[RFC2132] |
52 |
Overload |
Overload "sname" or "file" |
dhcp-option-overload |
1 |
[RFC2132] |
53 |
DHCP Msg Type |
DHCP Message Type |
dhcp-message-type |
1 |
[RFC2132] |
54 |
DHCP Server Id |
DHCP Server Identification |
dhcp-server-identifier |
4 |
[RFC2132] |
55 |
Parameter List |
Parameter Request List |
dhcp-parameter-request-list |
N |
[RFC2132] |
56 |
DHCP Message |
DHCP Error Message |
dhcp-message |
N |
[RFC2132] |
57 |
DHCP Max Msg Size |
DHCP Maximum Message Size |
dhcp-max-message-size |
2 |
[RFC2132] |
58 |
Renewal Time |
DHCP Renewal (T1) Time |
dhcp-renewal-time |
4 |
[RFC2132] |
59 |
Rebinding Time |
DHCP Rebinding (T2) Time |
dhcp-rebinding-time |
4 |
[RFC2132] |
60 |
Class Id |
Class Identifier |
vendor-class-identifier |
N |
[RFC2132] |
61 |
Client Id |
Client Identifier |
dhcp-client-identifier |
N |
[RFC2132] |
62 |
Netware/IP Domain |
Netware/IP Domain Name |
nwip-domain |
N |
[RFC2242] |
63 |
Netware/IP Option |
Netware/IP sub Options |
nwip-suboptions |
N |
[RFC2242] |
64 |
NIS-Domain-Name |
NIS+ v3 Client Domain Name |
nisplus-domain |
N |
[RFC2132] |
65 |
NIS-Server-Addr |
NIS+ v3 Server Addresses |
nisplus-servers |
N |
[RFC2132] |
66 |
Server-Name |
TFTP Server Name |
tftp-server-name |
N |
[RFC2132] |
67 |
Bootfile-Name |
Boot File Name |
bootfile-name |
N |
[RFC2132] |
68 |
Home-Agent-Addrs |
Home Agent Addresses |
mobile-ip-home-agent |
N |
[RFC2132] |
69 |
SMTP-Server |
Simple Mail Server Addresses |
smtp-server |
N |
[RFC2132] |
70 |
POP3-Server |
Post Office Server Addresses |
pop-server |
N |
[RFC2132] |
71 |
NNTP-Server |
Network News Server Addresses |
nntp-server |
N |
[RFC2132] |
72 |
WWW-Server |
WWW Server Addresses |
www-server |
N |
[RFC2132] |
73 |
Finger-Server |
Finger Server Addresses |
finger-server |
N |
[RFC2132] |
74 |
IRC-Server |
Chat Server Addresses |
irc-server |
N |
[RFC2132] |
75 |
StreetTalk-Server |
StreetTalk Server Addresses |
streettalk-server |
N |
[RFC2132] |
76 |
STDA-Server |
ST Directory Assist. Addresses |
streettalk-directory-assistance-server |
N |
[RFC2132] |
77 |
User-Class |
User Class Information |
user-class |
N |
[RFC3004] |
78 |
Directory Agent |
directory agent information |
slp-directory-agent |
N |
[RFC2610] |
79 |
Service Scope |
service location agent scope |
slp-service-scope |
N |
[RFC2610] |
80 |
Rapid Commit |
Rapid Commit |
unknown-80 |
0 |
[RFC4039] |
81 |
Client FQDN |
Fully Qualified Domain Name |
fqdn |
N |
[RFC4702] |
82 |
Relay Agent Information |
Relay Agent Information |
relay-agent-information |
N |
[RFC3046] |
83 |
iSNS |
Internet Storage Name Service |
unknown-83 |
N |
[RFC4174] |
84 |
REMOVED/Unassigned |
- |
unknown-84 |
- |
[RFC3679] |
85 |
NDS Servers |
Novell Directory Services |
nds-servers |
N |
[RFC2241] |
86 |
NDS Tree Name |
Novell Directory Services |
nds-tree-name |
N |
[RFC2241] |
87 |
NDS Context |
Novell Directory Services |
nds-context |
N |
[RFC2241] |
88 |
BCMCS Controller Domain Name list |
- |
unknown-88 |
- |
[RFC4280] |
89 |
BCMCS Controller IPv4 address option |
- |
unknown-89 |
- |
[RFC4280] |
90 |
Authentication |
Authentication |
unknown-90 |
N |
[RFC3118] |
91 |
client-last-transaction-time option |
- |
unknown-91 |
- |
[RFC4388] |
92 |
associated-ip option |
- |
unknown-92 |
- |
[RFC4388] |
93 |
Client System |
Client System Architecture |
unknown-93 |
N |
[RFC4578] |
94 |
Client NDI |
Client Network Device Interface |
unknown-94 |
N |
[RFC4578] |
95 |
LDAP |
Lightweight Directory Access Protocol |
unknown-95 |
N |
[RFC3679] |
96 |
REMOVED/Unassigned |
- |
unknown-96 |
- |
[RFC3679] |
97 |
UUID/GUID |
UUID/GUID-based Client Identifier |
unknown-97 |
N |
[RFC4578] |
98 |
User-Auth |
Open Group's User Authentication |
uap-servers |
N |
[RFC2485] |
99 |
GEOCONF_CIVIC |
- |
unknown-99 |
- |
[RFC4776] |
100 |
PCode |
IEEE 1003.1 TZ String |
unknown-100 |
N |
[RFC4833] |
101 |
TCode |
Reference to the TZ Database |
unknown-101 |
N |
[RFC4833] |
102-107 |
REMOVED/Unassigned |
- |
- |
- |
[RFC3679] |
108 |
REMOVED/Unassigned |
- |
unknown-108 |
- |
[RFC3679] |
109 |
Unassigned |
- |
unknown-109 |
- |
[RFC3679] |
110 |
REMOVED/Unassigned |
- |
unknown-110 |
- |
[RFC3679] |
111 |
Unassigned |
- |
unknown-111 |
- |
[RFC3679] |
112 |
Netinfo Address |
NetInfo Parent Server Address |
unknown-112 |
N |
[RFC3679] |
113 |
Netinfo Tag |
NetInfo Parent Server Tag |
unknown-113 |
N |
[RFC3679] |
114 |
URL |
URL |
unknown-114 |
N |
[RFC3679] |
115 |
REMOVED/Unassigned |
- |
unknown-115 |
- |
[RFC3679] |
116 |
Auto-Config |
DHCP Auto-Configuration |
unknown-116 |
N |
[RFC2563] |
117 |
Name Service Search |
Name Service Search |
unknown-117 |
N |
[RFC2937] |
118 |
Subnet Selection Option |
Subnet Selection Option |
subnet-selection |
4 |
[RFC3011] |
119 |
Domain Search |
DNS domain search list |
unknown-119 |
N |
[RFC3397] |
120 |
SIP Servers DHCP Option |
SIP Servers DHCP Option |
unknown-120 |
N |
[RFC3361] |
121 |
Classless Static Route Option |
Classless Static Route Option |
unknown-121 |
N |
[RFC3442] |
122 |
CCC |
CableLabs Client Configuration |
unknown-122 |
N |
[RFC3495] |
123 |
GeoConf Option |
GeoConf Option |
unknown-123 |
16 |
[RFC3825] |
124 |
V-I Vendor Class |
Vendor-Identifying Vendor Class Information |
unknown-124 |
- |
[RFC3925] |
125 |
V-I Vendor-Specific |
Vendor-Identifying Vendor-Specific Information |
unknown-125 |
- |
[RFC3925] |
126 |
Removed/Unassigned |
- |
unknown-126 |
- |
[RFC3679] |
127 |
Removed/Unassigned |
- |
unknown-127 |
- |
[RFC3679] |
128 |
PXE Etherboot signature. 6 bytes: E4:45:74:68:00:00 DOCSIS "full security" server IP address TFTP Server IP address (for IP Phone software load) |
- |
unknown-128 |
- |
[RFC4578] |
129 |
PXE Kernel options. Variable length string Call Server IP address |
- |
unknown-129 |
- |
[RFC4578] |
130 |
PXE Ethernet interface. Variable length string. Discrimination string (to identify vendor) |
- |
unknown-130 |
- |
[RFC4578] |
131 |
PXE Remote statistics server IP address |
- |
unknown-131 |
- |
[RFC4578] |
132 |
PXE IEEE 802.1Q VLAN ID |
- |
unknown-132 |
- |
[RFC4578] |
133 |
PXE IEEE 802.1D/p Layer 2 Priority |
- |
unknown-133 |
- |
[RFC4578] |
134 |
PXE Diffserv Code Point (DSCP) for VoIP signalling and media streams |
- |
unknown-134 |
- |
[RFC4578] |
135 |
PXE HTTP Proxy for phone-specific applications |
- |
unknown-135 |
- |
[RFC4578] |
136 |
OPTION_PANA_AGENT |
- |
unknown-136 |
- |
[RFC-ietf-dhc-paa-option-05.txt] |
137-149 |
Unassigned |
- |
- |
- |
[RFC3942] |
150 |
TFTP server address Etherboot GRUB configuration path name |
- |
unknown-150 |
- |
- |
151-174 |
Unassigned |
- |
- |
- |
[RFC3942] |
175 |
Etherboot |
- |
unknown-175 |
- |
- |
176 |
IP Telephone |
- |
unknown-176 |
- |
- |
177 |
Etherboot PacketCable and CableHome (replaced by 122) |
- |
unknown-177 |
- |
- |
178-207 |
Unassigned |
- |
- |
- |
[RFC3942] |
208 |
pxelinux.magic (string) = F1:00:74:7E (241.0.116.126) |
- |
unknown-208 |
- |
- |
209 |
pxelinux.configfile (text) |
- |
unknown-209 |
- |
- |
210 |
pxelinux.pathprefix (text) |
- |
authenticate |
- |
- |
211 |
pxelinux.reboottime (unsigned integer 32 bits) |
- |
unknown-211 |
- |
- |
212-219 |
Unassigned |
- |
- |
- |
- |
220 |
Subnet Allocation Option |
- |
unknown-220 |
- |
- |
221 |
Virtual Subnet Selection Option |
- |
unknown-221 |
- |
- |
222-223 |
Unassigned |
- |
- |
- |
[RFC3942] |
224-254 |
Private Use |
- |
- |
- |
- |
255 |
End |
None |
option-end |
0 |
[RFC2132] |