The Device List menu displays an overall view of the devices connected to your LAN. This information is gathered from a number of different sources including DHCP leases, ARP tables, and WiFi clients.
Interface reports details of the interface on which the router sees the device. Since release 2021.3, this includes physical and logical interface name, and wireless SSID.
brXis a bridge (representing the LAN).
ethXis an Ethernet physical interface. This name might be used directly, or it might be used indirectly if things like a bridge, PPP, or VPN connection are associated with the interface.
vlanXis a virtual interface that will always be related to a physical interface. In the example above, vlan2 represents the WAN interface.
wlXis a wireless radio interface. If you have Virtual Wireless set up you'll probably have several of these depending on the number of radios available in your hardware (2.4 and 5GHz). Virtual wireless interfaces will also appear here. Main Wireless chipset interfaces are named as wlX. Virtual wireless interfaces are named as wlX.X .
For WiFi-connected devices, the SSID they are connected to will appear under the interface name.
In FreshTomato, device names start at 0. The first WiFi adapter might be named “wl0”. The second Ethernet adapter might be named “eth1”. Additional instances are created when virtual interfaces are created (secondary SSIDs).
Media: In this column, an icon represents the interface on which the device is connected and its connection status. Interface types include:
WAN interfaces are represented with black and white inverted, while a grayed-out power icon represents a device that is disconnected or off.
MAC Address is the physical (hardware) address associated with the interface.
IP Address displays the IP address linked to the MAC address of the client device. If no IP address is shown, one is not assigned/known yet. This can briefly happen during the authentication phase of wireless devices, even if the wireless password is incorrect.
Name shows the DHCP Hostname of the client device. If no name is shown, it is typically because the device got its DHCP lease on the network from a different router, or this router was rebooted after the lease was given. You can work around this by adding your own dhcp-host reference in the dnsmasq Custom configuration.
Please note this field is also affected by the “Generate a name for DHCP clients which do not otherwise have one” parameter in the DHCP/DNS menu.
RSSI indicates Relative Signal Strength. This applies only to WiFi clients connected to this router. RSSI is measured in negative numbers, where 0 is the best possible value. Thus, -53 is a stronger signal than -74. If possible, keep your wireless devices away from metal, concrete, mirrors, and appliances with large motors or compressors (air conditioners, refrigerators, elevators). They all can consistently reduce signal strength/quality.
Quality is similar to RSSI but considers other parameters, such as noise floor, and interference. This gives a more accurate assessment of the signal.
TX/RX Rate is the current transmit/receive link speeds between the router and the wireless client device. It is normal for these numbers to go up and down based on the activity level of the client device and the quality/distance of the signal.
Lease displays the time remaining before the DHCP lease expires. The lease time text is also a hyperlink; clicking on it allows you to delete the current DHCP lease from the database, and deauthorize the device (if it's connected via WiFi). This can be useful when creating static IP reservations, to make connected devices refresh their previously automatically-assigned IP to the new, manually-reserved one:
Noise floor indicates the amount of interference affecting each physical radio interface. Noise, like RSSI, is measured in negative numbers. The best possible value is -100dBm. Any interference will push up the (noise) value and decrease the Quality.
If you experience a strong RSSI and a strong Noise floor, the WiFi is likely to be unusable. In such situations, the main issue is usually other routers or Access Points transmitting on the same channel. Use the Wireless Survey function to get more information.
On the 2.4GHz band, common sources of interference include Bluetooth devices, cordless phones, wireless headphones, low-quality power supplies, microwave ovens, etcetera. On the 5GHz band, there are typically fewer sources of interference. One source of interference is DFS (Dynamic Frequency Selection) but for specific channels only. DFS is a WiFi function that enables 5GHz WiFi to use frequencies that are generally reserved for radar. Ironically, DFS was designed to reduce interference, not increase it. DFS interference varies, depending on the country/physical location of the equipment. If you suspect your interference is due to DFS, please see Wikipedia's List of WLAN Channels for details.
Measure: On certain (mainly MIPS-based) devices, there is an extra button to trigger the measurement of Noise Floor (interference). For more information on the noise floor, see the Wireless Survey menu.
Network Discovery: Starting with release 2021.4, a network discovery function was introduced. It is disabled by default. If enabled, it will remain set for the length of the web interface session, although actual scanning/discovery will stop as soon as you leave the Device List menu. Network Discovery can be set to use the Linux arping command or the traceroute command. Essentially, the function scans all the IP addresses in range to try to accurately populate the Device List table. Arping is the preferred setting, as it's faster and lighter on resources. However, sometimes, such as with Apple devices, traceroute appears to perform network discovery more precisely.
To the right of the Network Discovery mode is a non-configurable countdown timer which represents how often the script is run. The countdown is essentially the ARP cache aging time. Remember that modern WiFi devices might stay connected to the router while in deep sleep mode. Network Discovery will likely detect those devices, but the Hostname information may not appear until they are awakened.