Difference between revisions of "RUT230 LAN"

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==Summary==
+
{{Template: Networking_rutos_manual_lan
 
+
<!---------DEVICE DETAILS--------->
{{Template: webui_network_lan_summary}}
+
| name   = RUT240
 
+
| series = RUT2
==Configuration==
+
<!-----------SEPARATORS----------->
 
+
| wifi  = 1
===General Setup===
+
}}
----
 
The General Setup tab provides you with the possibility to set the router's Private IP address, IP netmask and IP broadcast.
 
 
 
[[File:Network lan configuration general.PNG]]
 
 
 
{| class="wikitable"
 
|+
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
 
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | IP address
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip; Default: '''192.168.1.1'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | IP address that the device uses on the LAN network
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | IP netmask
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip; Default: '''255.255.255.0'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | A netmask is used to define how “large" the LAN network is
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | IP broadcast
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip; Default: " "
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | IP broadcasts are used by BOOTP and DHCP clients to find and send requests to their respective servers
 
|-
 
|}
 
 
 
===Advanced Settings===
 
----
 
LAN Configurations Advanced Settings tab contains some less frequently used, more complicated configurations, such as custom MTUs and network interface metric values.
 
 
 
[[File:Network lan configuration advanced.PNG]]
 
 
 
{| class="wikitable"
 
|+
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
 
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Accept router advertisements
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Allows accepting router advertisements
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Override MTU
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer [0..1500]; Default: '''1500'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | MTU (Maximum Transmission Unit) specifies the largest possible size of a data packet
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Use gateway metric
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer; Default: '''0'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | The LAN configuration generates an entry in the routing table. In this field you can alter the metric of that entry. Higher metric means higher priority
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Use WAN port as LAN
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | If this is enabled, the router's WAN port will act as if it were a LAN port. '''Works only if WAN is not set to wired'''
 
|-
 
|}
 
 
 
==DHCP Server==
 
 
 
{{Template: webui_network_lan_dhcp_summary}}
 
 
 
===General===
 
----
 
{{Template: webui_network_lan_dhcp_general_setup}}
 
 
 
[[File:Network lan dhcpserver general.PNG]]
 
 
 
{| class="wikitable"
 
|+
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
 
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | DHCP
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable {{!}} Disable {{!}} DHCP Relay; Default: '''Enable'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enables or disables DHCP Server. If DHCP Relay is selected, you will be prompted to enter an IP address of another DHCP server in your LAN. In this case, Whenever a new device connects to the router, the router will redirect any DHCP requests to the specified DHCP Server
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Start
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer [1..253]; Default: '''100'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | The starting IP address value. e.g., if your router’s LAN IP is 192.168.2.1 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 [192.168.2.0..192.168.2.254] (192.168.2.255 is a special unavailable address). If the Start value is set to 100 then the DHCP server will only lease out addresses starting from 192.168.2.100
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer [1..4294967296]; Default: '''150'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | How many addresses the DHCP server can lease out. Continuing from the above example: if the start address is 192.168.2.100 and the server can lease out 150 (default limit value), availabe addresses will be from 192.168.2.100 to 192.168.2.249 (100 + 150 – 1 = 249; this is because the first address is inclusive)
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Lease time
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | time in 'h' (hours) or 'm' (minutes); Default: '''12h'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | The duration of an IP lease. Leased out addresses 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 DHCP lease. However, if the device stays connected, its lease will be renewed after half of the specified amount of time passes, e.g., if the lease time is 12 hours, then every 6 hours the device will send a request to the DHCP server asking to renew its lease
 
Lease time can be set in '''hours''' ('''h''') or '''minutes''' ('''m'''). The minimal amount of time that can be specified is '''2min''' ('''2m''')
 
|-
 
|}
 
 
 
===Advanced Settings===
 
----
 
{{Template: webui_network_lan_dhcp_andvanced_settings}}
 
 
 
[[File:Network lan dhcpserver advanced.PNG]]
 
 
 
{| class="wikitable"
 
|+
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
 
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Dynamic DHCP
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''yes'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enables Dynamic allocation of client addresses. If this is disabled, only clients that have static IP leases will be served
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable DNS rebind protection
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''yes'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enables DNS rebind attack protection by discarding upstream RFC1918 responses (leave default unless necessary otherwise)
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Force
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 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
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | IP netmask
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip; Default: '''255.255.255.0'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Overrides your LAN netmask, thus making the DHCP server think that it’s serving a larger or smaller network than it actually is
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | DHCP Options
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | DHCP options; Default: " "
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 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 [https://technet.microsoft.com/en-us/library/cc958941.aspx here] <br> You can add more options by clicking the plus symbol ([[Image:Services sms gateway auto reply plus symbol.PNG]]) located next to the field
 
|-
 
|}
 
 
 
==Static Leases==
 
 
 
Static IP leases are used to reserve specific IP addresses for specific devices by binding them to their MAC address. This is useful when you have a stationary device connected to your network that you need to reach frequently, e.g., printer, IP phone, etc.
 
 
 
[[File:Network lan staticleases.PNG]]
 
 
 
{|class="wikitable"
 
|+
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
 
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Hostname
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | string; Default: " "
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | A custom name that will be linked with the device
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | MAC address
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | mac; Default: " "
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Device’s MAC address
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | IP address
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip; Default: " "
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | The desirable IP address that will be reserved for the specified device
 
|-
 
|}
 
 
 
==IP Aliases==
 
 
 
IP Aliases are a way of defining or reaching a subnet that works in the same space as the regular network. This is useful if you need to reach the router that is located in the same network but in a different subnet. If you have a static IP configuration on your computer and don’t want to change it every time you need to reach a router in a different subnet, you can configure an IP alias in order to do so.
 
 
 
===General setup===
 
----
 
[[File:Network lan ip alias general.png]]
 
 
 
{| class="wikitable"
 
|+
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
 
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | IP address
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip; Default: " "
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | An alternate IP address used to reach the router by a device(s) that resides in the router's LAN but has a different subnet
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Netmask
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip; Default: '''255.255.255.0'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Netmask defines how "large" a network is
 
|-
 
|}
 
 
 
As you can see, the configuration is very similar to the static protocol; in the example above an IP address with a 99th subnet is defined. In this case, if some device has an IP in the 99th subnet (e.g., 192.168.99.xxx) and the subnet’s gateway metric is “higher” and the device is trying to reach the internet it will reroute it’s traffic not to the gateway that is defined in common configurations but through the one that is specified in IP aliases.
 
 
 
===Advanced Settings===
 
----
 
You may also define a broadcast address, a custom DNS server and Gateway for your IP Aliases in the Advanced Settings tab.
 
 
 
[[File:Network lan ip alias advanced.png]]
 
 
 
{| class="wikitable"
 
|+
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
 
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | IP Broadcast
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip; Default: " "
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | IP broadcasts are used by BOOTP and DHCP clients to find and send requests to their respective servers
 
|-
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | DNS
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip; Default: " "
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | A separate DNS server to be used by the IP Alias address
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Gateway
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip; Default: " "
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | A gateway is a network node that connects two networks using different protocols together
 
|-
 
|}
 
 
 
==Relayd==
 
 
 
'''Relayd''' is a daemon to relay and dynamically redirect incoming connections to a target host. Its main purpose in RUT routers is extending the wireless network. For example, when RUT is in STA (Wireless Station) mode, it can be used to bridge WAN and LAN interfaces to create a larger Wireless network. You can find a detailed example on how to use Relayd '''[[Relayd|here]]'''.
 
 
 
[[File:Network lan relayd.png]]
 
 
 
{| class="wikitable"
 
|+
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
 
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
 
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
 
|-
 
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles Relayd ON or OFF
 
|-
 
|}
 

Latest revision as of 11:07, 6 October 2021

Main Page > RUT Routers > RUT240 > RUT240 Manual > RUT240 WebUI > RUT240 Network section > RUT230 LAN

The information in this page is updated in accordance with firmware version RUT2_R_00.07.01.2.


Note: click here for the old style WebUI (FW version RUT2XX_R_00.01.14.5 and earlier) user manual page.

Summary

The LAN page is used to create and set up local area network interfaces.

This manual page provides an overview of the LAN windows in RUT240 devices.

LAN Configuration

The LAN Configuration section displays LAN interfaces currently existing on this device.

Networking rutos manual lan settings v1.png

To begin configuring an interface, click the 'Edit' button on the right side of the interface:

Networking rutos manual lan begin to edit v1.png

General Setup


The General Setup section is used to configure the main parameters of LAN.

Networking rutos manual lan configuration general setup v1.png

Field Value Description
IPv4 address ip4; default: 192.168.1.1 The IPv4 address interface of this interface. An IP address identifies a device on a network and allows it to communicate with other devices.
IPv4 netmask netmask; default: 255.255.255.0 The IPv4 netmask of this interface. 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 a device.
IPv4 gateway ip4; default: none The IPv4 gateway address used by this interface. An interface's default gateway is the default address through which all outgoing traffic is directed.
DNS servers ip4; default: none DNS server addresses that this interface will use. If left empty, DNS servers are assigned automatically. To see what DNS servers are currently used, you can check the contents of the /tmp/resolv.conf.auto file.

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.

Networking rutx manual lan static dhcp server scheme v1.png

Networking rutos manual lan configuration dhcp server general setup v1.png

Field Value Description
Enable DHCP Enable | Disable | DHCP Relay*; default: Enable Turns the DHCP server on or off or enables DHCP relay*.
If DHCP Relay* is selected, you will be prompted to enter an IP address of another DHCP server in your LAN. In this case, whenever a new machine connects to this device, it will redirect any DHCP requests to the specified DHCP Server.
Start integer [1..255]; default: 100 The starting IP address value. e.g., if your device’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 integer [1..999999]; default: 12
integer [2..999999]*
integer [120..999999]**
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.
*If selected Units is Minutes.
**If selected Units is seconds.
Units Hours | Minutes | Seconds; default: Hours Lease time measurement units.

* When an interface is set to act as a DHCP Relay, it redirects all received DHCP request messages to another specified DHCP server:

Networking rutx manual lan static dhcp server relay scheme v2.png