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:
|IP address||ip4; default: 192.168.1.1||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: 255.255.255.0||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.|
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.
To find information on general DHCP server settings, refer to the figure and table below:
|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 192.168.1.1 and your subnet mask is 255.255.255.0 that means that in your network a valid IP address has to be in the range of [192.168.1.0..192.168.1.254] (192.168.1.255 is a special unavailable address). If the Start value is set to 100 then the DHCP server will only lease out addresses starting from 192.168.1.100.|
|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 192.168.1.100 and the server can lease out 150 addresses, available addresses will be from 192.168.1.100 to 192.168.1.249 (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.
To find information on advanced DHCP server settings, refer to the figure and table below:
|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.|