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Appendix A
Table 7 DHCP Options
Option
Description
Notes
1
Subnet Mask
Required. However, it is not is not required unless the thin
client must interact with servers on a different subnet (MS
DHCP requires a subnet mask and will always send one).
2
Time Offset
Optional.
3
Router
Optional, but recommended. It is not required unless the
thin client must interact with servers on a different subnet.
6
Domain Name Server
(DNS)
Optional, but recommended.
15
Domain Name
Optional, but recommended. See Option 6.
28
Broadcast Address
Optional.
44
WINS servers IP Address
Optional.
51
Lease Time
Optional, but recommended.
52
Option Overload
Optional.
53
DHCP Message Type
Recommended.
54
DHCP Server IP Address
Recommended.
55
Parameter Request List
Sent by thin client.
57
Maximum DHCP
Message Size
Optional (always sent by thin client).
58
T1 (renew) Time
Optional, but recommended.
59
T2 (rebind) Time
Optional, but recommended.
61
Client identifier
Always sent.
161
File server (ftp/http/https)
Optional string. Can be either the name or the IP address
of the file server. If a name is given, the name must be
resolvable by the DNS server(s) specified in Option 6. If the
option provided by the server is blank or the server
provides no value for the field, the machine on which the
DHCP server resides is assumed to also be the file server.
