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Conﬁguring the DHCP Client

8.4 Conﬁguring the DHCP Client

If you want more than the set of services conﬁgured by this option, you can

conﬁgure your host with the subset of TCP/IP Services and at a later time run

TCPIP$CONFIG to conﬁgure other services.

DHCP client autoconﬁgure puts each unconﬁgured IP interface under DHCP

control. It employs the following rules to decide which, if any, interface should

be marked as the primary interface. (See Section 8.1.1 for an explanation of the

DHCP primary interface.)

• If any interface currently has a permanent IP address, then TCPIP$CONFIG

will not mark any of the interfaces under DHCP control as primary.

• If no interfaces are currently conﬁgured, then the ﬁrst interface that

TCPIP$CONFIG sees and marks as under DHCP control becomes the primary

DHCP interface.

8.4.1.2 Using TCPIP$CONFIG to Conﬁgure an Existing Installation

If you have an existing TCP/IP installation, use TCPIP$CONFIG to place

interfaces under DHCP control. To do this, perform the following steps:

1. From the TCPIP$CONFIG main menu, choose the Core Environment option

and then choose the Interfaces option.

2. TCPIP$CONFIG presents a menu for each interface that it ﬁnds and gives

you the option to:

Conﬁgure the interface manually.

Allow DHCP client to conﬁgure the interface.

Leave the interface unchanged.

The following example illustrates this procedure:

INTERFACE Configuration

The Ethernet device(s) on your system are: ESA0:

Start of configuration questions for Internet interface SE0.

SE0 is the Ethernet device ESA0:

Interface: SE0

IP_Addr: 10.0.0.1 NETWRK: 255.0.0.0 BRDCST: 10.255.255.255

C_Addr: C_NETWRK: C_BRDCST:

Flags:

Receive buffer: 0

Compaq TCP/IP Services for OpenVMS Interface SE0 Reconfiguration Menu

Reconfiguration options:

1 - Configure interface manually (Current default)

2 - Let DHCP configure interface

[E] - Exit menu (Do not reconfigure interface SE0)

Enter configuration option: 2

End of configuration questions for Internet interface SE0

3. If the system has multiple interfaces, DHCP client displays information about

each existing interface and gives you the option to conﬁgure the interface

manually or to allow DHCP conﬁgure the interface.

Conﬁguring the DHCP Client 8–13