To complete unqualified domain name system (DNS) names that will be used to search and submit DNS queries at the client for resolution, you must have a list of DSN suffixes that can be appended to these DNS names. For DHCP clients, this can be set by assigning the DNS domain name option (Option 15) and providing a single DNS suffix for the client to append and use in searches.
In some circumstances it is preferable that a DHCP client be configured by using multiple DNS suffixes, supported with the use of DHCP Search Option 119.
DHCP Search Option 119 is passed from the DHCP server to the DHCP client to specify the domain search list used when resolving hostnames with DNS. DHCP Search Option 119 applies only to DNS and does not apply to other name resolution mechanisms.
Table 1. DHCP options for domain search list
| DHCP Option | Description |
|---|---|
|
015 |
Specifies the connection-specific DNS domain suffix to be used by the DHCP client. |
|
119 |
DNS Domain Search List option to specify the domain search list used when resolving hostnames with DNS. |
To enable search option 119 for Windows Server 2003 DHCP server
- Open DHCP. (To open DHCP, click
Start, point to
Settings, click
Control Panel, double-click
Administrative Tools,and then double-click
DHCP.
)
- In the console tree, click the applicable DHCP server.
- On the
Actionmenu, click
Set Predefined Options.
- In
Predefined Options and Values, click
Add(Option Class Standard), and then click
OK.
- In
Name, type the string DNS Search List
.
- Set Code to
119and
Data Typestring (it is not an array), and then click
OK.
- Right-click
Scope Options, select
Configure Options, and then check
119 DNS Search List.
- Enter a list of domain suffixes in your organization, delimited
by a semicolon (for example,
contoso.com;dev.contoso.com;corp.microsoft.com).
- Click
OK.