The Device List displays an overall view of (client) devices connected to your LAN. Information is gathered from different sources, such as clients connected to Wi-Fi, DHCP leases, ARP tables, etcetera.
Interface: represents the interface on which the router sees the device. At first, interface names might be a bit confusing.
Note that in Tomato (Linux), device name numbers start at 0. The first Wi-Fi adapter might be named wl0. The second Ethernet adapter might be named eth1. Additional instances are created when virtual interfaces are created (secondary SSIDs).
MAC Address: is the physical (hardware) address associated with the interface.
IP Address: reports on the IP address linked to the MAC address.
Name: shows the DHCP Hostname aka Client Identifier. If a name is missing, it could be because your device is not directly connected to the router (e.g. via external switch or AP). You can work around this by adding your own dhcp-host reference in the dnsmasq Custom configuration. For example:
RSSI: indicates the Relative Signal Strength. This applies only to directly-connected Wi-Fi clients. RSSI is measured in negative numbers, where 0 is the best possible value. Thus, in the example below, -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 takes into account 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 speeds between Tomato and the wireless client device. These numbers will go up and down based on the activity level of the client device. This is not the same as the link speed.
Lease: respresents how much time remains before the DHCP lease expires. If you hover over the lease time, an option appears to manually delete the lease from the current DHCP lease database:
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 Wi-Fi 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, there are well-known sources of interference, such as Bluetooth, cordless phones, wireless headphones, poor 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). DFS is a Wi-Fi function that enables 5GHz Wi-Fi 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.
Measure: Clicking on the Measure button beside any Noise Floor (interface) will make Tomato measure the noise floor of the Wi-Fi interface on that interface. For more information on noise floor, see the Wireless Survey page.
List of WLAN channels