Revision 2010-11-15
Page 4 of 33
Configuring DHCP Server and Relay Agent
The following information will be helpful as you configure the N-Tron DHCP Server. A high level flow of
the basic configuration is provided by Figure: Flow_DHCP_1.
In order to use the DHCP server in offering IP addresses, several configuration steps are essential. N-Tron
uses Profiles and Mappings to organize how the IP’s will be offered to Clients. You must have at least one
Profile defined in order to add mappings.
The menu
Setup Profiles
shows DEFAULT as a Profile. The DEFAULT Profile allows you to define some
changeable parameters that are automatically included within the Profile you define. The changeable
Profile entries can be seen by pressing the,
Advanced,
button when adding a Profile. You do not have to
make use of this DEFAULT Profile. The DEFAULT Profile information is used by the DHCP Server when
communicating with the DHCP Client. The use of the DEFAULT Profile simplifies the changing of
information of already defined Profiles by automatically inserting data found in the DEFAULT profile into
the Profile used when allocating an IP addresses to a Client.
The Profile Setup has entries to define an Address Pool range. It is important to decide what this range
should be, since your IP address mappings will be a subset of this range. Profiles cannot overlap their
Address Pool ranges with other Profiles.
The Profile Setup
Lease Time
: designates the amount of time an IP will be honored by a Server that has
made an offer to a Client. The Lease Time insures that the IP address offered by the Server will not be
offered to any other Client device until the Lease expires. The Client will use a renewal process to maintain
the IP for longer periods of time by requesting an extension for the address from the server.
Saving DHCP Settings and Data: The DHCP Profiles, Mappings and Bindings are stored in the N-Tron
switch file system when you click on the screen Update button. These changes are automatically saved for
you. Parameters such as Enabling and Disabling the DHCP Server are part of the switch Settings
configuration and you will be prompted by a message to save your changes.
Examples
Examples are provided for the following settings:
Setting up a Dynamic Range
Setting up a Static Range
Setting up a Single IP
Setting up an N-Tron Switch as a Client Device
Setting up the Relay Agent to obtain a Local IP Address
Setting up a redundant DHCP Server using 2 N-Rings across N-Link
