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: shows the interface on which the router sees the device. Since release 2021.3, this includes physical and logical interface name, and wireless SSID.
brX is a bridge representing the LAN.
ethX is an Ethernet physical interface.
vlanX is a virtual interface that will always be related to a physical interface.
wlX is a wireless radio interface.
For WiFi-connected devices, the SSID to which they are connected 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 “eth1”. Additional instances are created when virtual interfaces are created (secondary SSIDs).
Media: An icon in this column represents the interface on which the device is connected, and its connection status.
Interface types include:
WAN interfaces are shown with black and white inverted. A greyed-out power icon represents a device that is disconnected or off.
MAC Address: This is the physical (hardware) address associated with the interface.
IP Address: This displays the address linked to the client device's MAC address. If no address is shown, one is not assigned/known. This can happen briefly during authentication of wireless devices, even if the wireless password is correct.
Name: This shows the DHCP Hostname of the client device. If no name is shown, it's usually because the device got its 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.
This field is also affected by the “Generate a name for DHCP clients which do not otherwise have one” parameter in the DHCP/DNS/TFTP menu.
RSSI: This indicates Relative Signal Strength. It 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.
Quality: This is similar to RSSI, but considers other parameters, like noise floor, and interference. Quality is a more accurate assessment of the signal.
TX/RX Rate: This is the current transmit/receive link speeds between router and WiFi client device. It is normal for these numbers to fluctuate based on activity level of the client device and the quality/distance of the signal.
Lease: This displays the time remaining before a DHCP lease expires. The lease time is also a hyperlink. Clicking on it lets you delete the current DHCP lease from the database, and deauthorize the device (if WiFi-connected). This is useful when creating static IP reservations, to make connected devices refresh their previously automatically-assigned IP to the new, manually-reserved one:
Noise floor: This 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 increase 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 these situations, the main cause is usually other routers or Access Points transmitting on the same channel. Use the Wireless Survey tool to get more information.
On the 2.4GHz band, common sources of interference include:
Typically, there are fewer sources of interference on the 5GHz band. One source of interference is DFS (Dynamic Frequency Selection) but for certain channels only. DFS is a WiFi function that enables 5GHz WiFi to use frequencies generally reserved for radar. Ironically, DFS was designed to reduce interference. DFS interference varies, depending on the country/physical location of the equipment. If you suspect interference is due to DFS, see Wikipedia's List of WLAN Channels for details.
Measure: On certain (mostly 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: This function has been available since release 2021.4 . The Network Discovery function scans all IP addresses in a range to accurately populate the Device List table. (Default: disabled). If enabled, it will remain running for the length of the web interface session. However, it will stop if you leave the Device List menu.
Network Discovery can be set to use the Linux arping command or the traceroute command. Arping is the preferred setting, as it's faster and lighter on resources. However, sometimes, traceroute may perform network discovery more precisely. This is true with Apple devices.
To the right of the Network Discovery mode is a non-adjustable countdown timer which represents how often the script is run. Essentially, the countdown is the ARP cache aging time. Remember that modern WiFi devices may stay connected to the router while in sleep mode. Network Discovery will likely detect those devices, but the Hostname information may not appear until they awaken.