DHCP Server Options
|Domain Time II |
How to use DHCP Servers to specify time server addresses to Domain Time Client
Domain Time II Client using automatic discovery mode can be configured to check for the presence of a
DHCP server on the local subnet. If a DHCP server is found, the DHCP options 004 and/or 042 can be examined
to provide the IP address(es) of time servers for the Client to use.
The DHCP Time Server Options and Discovery Order
Note: It is not necessary to set the TCP/IP protocol stack to get its IP address from a DHCP server
in order for the Domain Time II Client to get a time server address. The Client uses its own independent inquiry of the
DHCP server to discover the time server options. Therefore DHCP discovery of time servers can be used
on a machine with either a static or a DHCP-assigned IP address.
An automatic Domain Time client with DHCP enabled will broadcast to locate a DHCP Server. Note that DHCP broadcasts usually do not cross routers.
If DHCP options 004 or 042 are configured, the DHCP server will respond with the IP address of the time server.
The client then uses the IP address provided by the DHCP server to contact and sync with the designated time server, even across a router.
These are the DHCP options that can be set to provide time server addresses. If enabled, they are examined in the order listed:
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