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A LAN (local area network) is a relatively small computer network that interconnects devices within a limited area such as a residence, school, laboratory, university campus, office building, etc. This chapter is an overview of the LAN section for TRB141 gateways.

The information in this page is updated in accordance with the TRB1410_R_00.01.05 firmware version.

LAN Configuration Options

The LAN Configuration Options section provides you with the possibility to configure the gateway's local area network settings. The figure below is an example of the LAN Configuration Options section and the table below provides information on the fields contained in that section:

Networking trb manual lan lan configuration v1.png

Field Value Description
IP address ip4; default: The interface's IPv4 address. An IP address identifies a device on a network and allows it to communicate with other devices.
Netmask netmask; default: A netmask is used to define how "large" a network is by specifying which part of the IP address denotes the network and which part denotes the device.
IP Broadcast ip; default: none IP broadcasts are used by BOOTP and DHCP clients to find and send requests to their respective servers.

DHCP Server

A DHCP (Dynamic Host Configuration Protocol) server is a service that can automatically configure the TCP/IP settings of any device that requests such a service. If you connect a device that has been configured to obtain an IP address automatically, the DHCP server will lease out an IP address from the available IP pool and the device will be able to communicate within the private network.

General Setup

To find information on general DHCP server settings, refer to the figure and table below:

Networking trb manual lan dhcp server general setup v1.png

Field Value Description
Enable DHCP off | on; default: on Turns the DHCP server on or off.
Start integer [1..255]; default: 100 The starting IP address value. e.g., if your router’s LAN IP is and your subnet mask is that means that in your network a valid IP address has to be in the range of [] ( is a special unavailable address). If the Start value is set to 100 then the DHCP server will only lease out addresses starting from
Limit integer [1..255]; default: 150 How many addresses the DHCP server can lease out. Continuing from the example above: if the start address is and the server can lease out 150 addresses, available addresses will be from to (100 + 150 – 1 = 249; this is because the first address is inclusive).
Lease time interger [2..999999] + time unit (m or h); default: 12h A DHCP lease will expire after the amount of time specified in this field and the device that was using the lease will have to request a new one. However, if the device stays connected, its lease will be renewed after half of the specified amount of time passes (e.g., if lease time is 12 hours, then every 6 hours the device will ask the DHCP server to renew its lease).
The minimal amount of time that can be specified is 2 minutes.

Advanced Settings

To find information on advanced DHCP server settings, refer to the figure and table below:

Networking trb manual lan dhcp server advanced settings v1.png

Field Value Description
Dynamic DHCP off | on; default: on Enables dynamic allocation of client addresses. If this is disabled, only clients that have static IP leases will be served.
Force off | on; defualt: off The DHCP force function ensures that the router will always start it’s DHCP server, even if there is another DHCP server already running in the router’s network. By default the router’s DHCP server will not start when it is connected to a network segment that already has a working DHCP server.
Netmask netmask; default: none Sends a different netmask than the LAN netmask to DHCP clients.
DHCP Options dhcp options; default: none Additional options to be added to the DHCP server. For example with '26,1470' or 'option:mtu, 1470' you can assign an MTU value per DHCP. You can find more information on DHCP Options here.