This page includes most basic settings needed to configure the network. It's divided into sections including MultiWAN, WAN Settings, Ethernet Ports Configuration, LAN and Wireless setttings.

Number of WAN ports: lets you select the number of WAN ports to be used on the device.

On routers with only one physical WAN interface, options with more WAN ports are greyed out. Only “1 WAN” can be selected in such cases.

Tune route cache: is used for MultiWAN configurations with load balancing.

This setting is advised when two or more WANs have a weight larger than “0”. It uses kernel tweaks to improve workload sharing.

For details, see the Notes section below.

Check Connections Every: makes FreshTomato automatically test WAN connection reliability. (Default: Disabled).

Choosing any setting but Disabled executes the Watchdog script. This sets how often the router (regularly) pings to test it's connected to the Internet.

The Watchdog script uses ping or traceroute to test WAN connection status.

Choosing a setting other than Disabled will make “Target 1” and “Target 2” fields appear.

• Target 1 - the address of the first host to ping (Default: Google.com)
• Target 2 - the address of the second host to ping (Default: Microsoft.com)
  
  

Settings here are used to configure the WAN interface. These settings depend on your ISP.

Depending on the type selected, other settings specific to the type of connection will be shown or hidden.

Type: sets the connection mode the WAN interface uses to connect to your ISP. (Default: DHCP).

• DHCP - Your ISP's DHCP server dynamically assigns a WAN IP lease to FreshTomato.
  • DHCP doesn't use authentication.
    
    

• PPPoE - The WAN port responds to authentication requests from your ISP's PPPoE server.
  • Usually used on DSL networks.
  • FreshTomato stores the PPPoE username/password assigned by your ISP.
  • If authentication succeeds, the PPPoE server allows logon to the ISP network,
    and a DHCP server assigns you a WAN IP lease.
  • Leave the Service Name field blank.
  • Starting with release 2021.3, support for Baby Jumbo Frames (RFC 4638)
    was added to the Miscellaneous menu.
  • When using Baby Jumbo Frames, set MTU to 1500, to be consistent with the
    Baby Jumbo Frames change. (See Notes).
    
    

• Static - will configure your WAN port with a static IP.
  • You must manually enter these settings in FreshTomato, from your ISP:
    • Static IP address
    • Subnet mask
    • Gateway address
    • DNS server addresses
  • This mode is usually used for business, when an IP address mustn't change.
    
    

• PPTP - configures the WAN port to use Microsoft's PPTP protocol to connect.
  • This section requires you to enter:
    • a username
    • password
    • gateway server settings (given by your ISP).
      
      

• L2TP - configures the WAN port to connect using Layer Two Tunneling Protocol.
  • FreshTomato requires you enter the following, provided by your ISP:
    • L2TP username
    • Password
    • L2TP server static IP address
    • Subnet mask
    • Gateway setting
      
      

• 3G modem - enables support for 3G cellular USB modems.
  • To detect a modem, USB and 3G/4G/5G modem support must be enabled in USB Support.
    
    

• 4G/LTE - enables support for fourth generation cellular/LTE USB modems.
  • When using 4G, PIN code and APN fields appear. You must enter correct settings.
  • To detect a modem, check USB and 3G/4G/5G modem support are enabled in USB Support.
    
    

• Disabled - disables the physical WAN port on your router.
  • This makes your device function only as a switch (if it has that function) and/or;
  • This may effectively make your device function as a WiFi A/P (if it has that function).
    
    

Wireless Client Mode: enables FreshTomato's Wireless Client mode.

This lets the router act as a client (WiFi adapter) to connect to another router/AP.
(For details, see Wireless Mode tables below).

• Disabled - Wireless Client mode will be disabled.
• 2.4 GHz - Wireless Client mode will be enabled on the 2.4 GHz interface.
• 5 GHz - Wireless Client mode will enabled on the 5 GHz interface.

Load Balance Weight: appears only when number of WANs > 1. Valid settings are between 0 and 256.

When FreshTomato is in a MultiWAN configuration, it performs load sharing of the links. Load sharing is performed on a per-session basis to prevent issues with interactive traffic, such as real-time voice/video, or RDP. After all, your links might have different speeds and per-packet load-sharing would generate out-of-order packets. That could make interactive traffic unusable. Setting a Load Balance Weight on each interface adjusts how it will participate in MultiWAN activities. Some examples follow.

Example: Load Balance Weight: 0 (Failover)
If “0” is used, FreshTomato won't route traffic if other WAN interfaces are functioning. However, a WAN connection with weight “0” will be automatically enabled if all other WAN interfaces with weight of 1 or more fail. This is commonly used in “failover” scenarios. When an interface with weight “0” is automatically enabled, it is assigned a weight of 1.

For example:

Let's assume we have 2 WANs, as follows:

• WAN0=“weight 0”

• WAN1=“weight 1”
  

When WAN1 fails, the failure is noticed. WAN0 will activate (assigned with weight: “1”) and begin routing packets.

Later, WAN1 recovers its connectivity. As soon as FreshTomato notices, (seconds/minutes), WAN0 will be set back to idle status while traffic is rerouted through the revived WAN1.

Recovering back to the originally active interface is called preempting. Preempting is the default (fixed) behavior.

Example: Load Balance Weight: 1
Any value higher than “0” makes an interface actively route packets.

Weights are relative, so a weight: “1” doesn't mean much. Each weight is compared to the other interface weights to direct functionality.

• One way of understanding this is: “1=100% and 0=0%”
• Thus, if WAN0=“weight 0” and WAN1=“weight 1”, WAN1 would be handle 100% of the traffic.

Example: Load Balance Weight: 5
Basically, an interface set to weight: “5” would handle 5 new sessions before any other interface was used.

For example, say we have 3 WANs, as follows:

• WAN0 = weight 0
• WAN1 = weight 1
• WAN2 = weight 5

Here, WAN0 would be used only if both WAN1 and WAN2 are both failing, and unable to route packets. WAN1 will handle the very first new LAN client session going through the router. WAN2 is set to handle the second, third, fourth, fifth and sixth sessions. The seventh new session starts again from WAN1, as it would be treated as a another first new LAN client session. WAN2 will then handle the next five new sessions, meaning the eighth, ninth, tenth eleventh and twelfth sessions.

These settings affect only outbound traffic. Return traffic always tries to return to the WAN interface it came from.

Allocation of a new session to a WAN is dynamic. You can set which traffic gets allocated to which Interface (“sticky connection”) in the MultiWAN routing menu.

Modem device: Here, specify the 3G/4G/5G modem's Linux device path/filename.

• If you're unsure, check your modem is listed in 3G/4G/5G Dongle compatibility.
• If your modem isn't detected, enable 3G/4G/5G modem and USB support in USB Support.
• If WAN type is 3G modem or 4G/LTE, fields appear asking for more information.
• The Default device filename is the first serial device on the first USB port: (/dev/ttyUSB0).
  • The “tty” part of the device's filename represents a serial device.
  • “USB0” in the device's filename means the device is connected to the first USB port.
  • Devices listed as “/ttyUSB” use the newer Serial→USB device driver framework.
• “ACM” in the device name type means the device type is: “Abstract Control Model”

To get modem details, log on to FreshTomato via Telnet/SSH and use the “lsusb” or “dmesg” commands .

PIN Code: is the 3-digit PIN code for the SIM card associated with your cell account.

• Leave this blank if your SIM card code was deactivated.
  
  

Modem init string: is where you enter the modem's default initialization string.

• Your cellular provider or modem manufacturer gives you this. (Default: *99#).
  
  

APN: is the access point name (provided by your cell carrier).

• Specifies a gateway to route data between your carrier and the Internet. (Default: internet).
  
  

Username: this is the (carrier-provided) username to access your cell carrier's APN gateway.

• Some carriers don't require this.
  
  

Password: is the (carrier-provided) password to authenticate to your cell carrier's APN gateway.

• Some carriers do not require this.
  
  

Network Type: appears when WAN type is set to 4G/LTE. (Default setting: 4G/3G/2G).

• The default setting sets FreshTomato to start negotiating with a 4G connection.
  Failing that, it falls back to negotiating a 3G connection, and if that fails, a 2G connection.
  
  

DNS Server:

• AUTO - FreshTomato uses DNS server addresses in your ISP's DHCP lease.
• Manual - Enables DNS server functions in dnsmasq. “DNS 1” and “DNS 2” fields appear.
  • DNS 1 - Enter DNS server 1 address here.
  • DNS 2 - Enter DNS server 2 address here.

Manually-set DNS servers can be helfpul if your ISP's DNS servers are slow/unreliable.

MTU: sets the Maximum Transmission Unit, (Ethernet frame size) for traffic between WAN and LAN.

This is for the WAN interface only and won't affect LAN traffic. Varied MTU sizes across devices may cause issues.

• (Default: 1500) - works for most Ethernet devices. Choosing it greys out the Manual field.
• Manual - Enter a custom value here. Jumbo Frames start at 2000 bytes.
  
  

Use DHCP: is rarely used. Generally, you should leave it disabled.

• A few Internet providers separate addressing from PPPoE functionality.
  
  

Single Line MLPPP: is outdated, and rarely used these days.

This Multilink PPP version allows one modem to bond the bandwidth of multiple PPPoE sessions.

A side effect was that it bypassed some ISPs' bandwidth throttling. It's no longer commonly used.

Route Modem IP: lets you access a modem “behind a router” with a quick setting change. (Default: Off)

• When using separate modem and router, usually the modem is in bridge mode or
  PPPoE passthrough mode. This makes it hard to access the modem's LAN interface,
  as it's “behind” the router.
• The router's WAN interface has a public address, but the modem is reachable
  only via a private LAN address.
• Private addresses aren't routable, so by default, FreshTomato blocks any traffic
  on a path of: LAN —> WAN —> (MODEM with PRIVATE IP).
• Route Modem IP adds a static route to the routing table, giving the modem a
  private address on a /32 subnet. This makes the private address reachable via
  the WAN interface, and thus via the LAN.
• The mask allows only one host, so only the modem is reachable on that subnet.
  
  

Query Hilink Modem IP: This function is only for Huawei USB modems supporting Hilink mode. (Default: Disabled).

This lets you communicate with a Huawei modem in Hilink mode connected to a network device other than the FreshTomato router.

It can be used to monitor modem statistics or signal strength.

Call Custom Status Script: TBD.

Connect Mode: chooses the method to keep the router connected to the Internet provider. (Default: Keepalive).

• Connect on Demand - makes the router disconnect from the ISP after the Max Idle Time.
  FreshTomato reconnects to the Internet as soon as a LAN client requests Internet access.
• Some ISPs drop a connection if their router detects no Internet activity.
  • Keepalive - makes FreshTomato send keepalive packets at brief, specified intervals.
    This makes the ISP “see” intermittent activity when no clients request Internet access.
• Redial Interval - how often the router checks the Internet connection. (Default: 10 seconds).
  This minimizes Internet connection response time, since usually the connection will be up.

Redial Interval: When PPPoE dialling fails, this is used to delay attempts for the defined number
of seconds. This allows more time for the PPPoE server or network gear to restart proper operation
before trying to re-establish a PPPoE connection.
(Default: 10 seconds).

LCP Echo Interval: Link Control Protocol sends/receives frames between two peers to check they're connected.

• LCP Echo Interval is the time between these signals.
• Usually used to check that a DSL modem's PPPoE is still connected to the ISP.
• (Default: 10 seconds).

LCP Echo Link fail limit: the number of failed LCP echo requests between peers before the status is considered dead.

• The client DSL modem will then drop the PPPoE link.
• LCP will then try to renegotiate a new PPPoE session.

Disable Watchdog: disables the Watchdog function, for only the WAN connection in the menu. (Default: Enabled/Tracert).

Watchdog Mode: regularly checks a given WAN connection is up. This chooses the method used to test the connection.

• Traceroute *
• Ping

The Watchdog function supports connection types:

1. DHCP
2. PPPoE
3. PPTP
4. L2TP
5. 3G/4G/5G LTE

The LAN section includes information and settings to configure FreshTomato's LAN interface functions.

This includes:

1. LAN IP address and subnet mask
2. Spanning Tree Protocol function
3. DHCP server status/settings (via dnsmasq), such as scope and lease time
4. Stubby (DNS-over-TLS) setting and WINS settings

Bridge: lets you Selects the bridge whose LAN settings will be modified

STP: enables Spanning Tree Protocol to prevent forwarding loops in switches. The default (off) is recommended, unless you are highly experienced.

IP Address: the IP Address to assign to the specified LAN interface. (Default: 192.168.1.1). FreshTomato supports Class A/B/C networks.

Netmask: the subnet mask associated with FreshTomato's LAN IP address. (Default: 255.255.255.0 - class “C” netmask).

DHCP: enables DHCP server functions in dnsmasq. (Default: Off)

IP Range (first/last): the range of IP addresses the DHCP server will assign to LAN clients. In the top field, enter the first valid address in the subnet. In the bottom field, enter the last valid address.

Lease Time (mins.): is the DHCP lease time, in minutes. (Default: 1440).

Automatic IP: lets FreshTomato obtain a LAN IP via DHCP. Since release 2022.6, you can select this option if the router is in AP Mode, Wireless Ethernet Bridge Mode or Media Bridge Mode.

After saving settings, the router's new, default address is 192.168.1.1 as it awaits DHCP details. That address changes once it obtains DHCP data.

These are settings for the Ethernet Ports State graphic in the Overview menu. For each port, the display shows Link status, Link speed and Diagnostic information.

Enable Ports State: Checking this enables the Ethernet Ports State graphic. (Default: On).

Show Speed Info: Checking this displays the link speed of each port, (1GB/100MB/10MB). (Default: On).

Invert ports order: Enabling this displays port icons in Ethernet Ports State in the opposite order from where they are on the hardware. This is useful when the sequence of display icons doesn't match the actual locations on the router. (Default: Off).

This feature makes FreshTomato assess on which band a client device should connect, and then “nudges” the client towards that band.

Options include:

• Disable *
• Enable

When enabled, these settings are saved to NVRAM, then replicated from the first wireless radio to all other radios:

1. SSID
2. Broadcast
3. KEY1-4
4. Shared Key
5. Encryption
6. Radius Key
7. Radius Port
8. Radius IP

(Visibility depends on the wireless security selected)

Among the wireless settings that will NOT be replicated are:

• Channel
• Channel Width
• Wireless Network Mode
• Band (2.4 / 5 GHz)
• Country Code/Rev
• Beamforming

Client devices can also try to switch bands on their own, without the influence of Wireless Band Steering.

This feature is available since release 2020.8 (for ARM hardware only). See the Notes section for more details.

The Wireless (2.4 GHz) section displays information and settings for the 2.4 GHz wireless network interface.

Your device may show a different device name than eth1. FreshTomato hardware device numbers begin at “0”. The first Ethernet device might be called “eth0”. The second wireless device might be called “wl1”.

Enable Wireless: When checked, this turns on the 2.4 GHz WiFi interface. When unchecked, the 2.4 GHz WiFi interface is off.

MAC Address: This displays the MAC address of the 2.4 GHz WiFi interface. Clicking on it takes you to the MAC Address page, where you can specify a custom MAC address for this interface.

Wireless Mode: This allows you to select the wireless mode (function) of the 2.4 GHz WiFi network interface.

Wireless Network Mode: Lets you choose which 802.11 WiFi protocols to make available to clients.

The network modes available in this dropdown will depend on your hardware.

• Auto: * FreshTomato/WiFi client devices negotiate the best protocol automatically.
  • This is recommended, unless you have advanced networking skills.
  • Compatibility issues can create problems. The best settings may not be obvious.
• B Only: allows WiFi clients to connect using only the 802.11b protocol.
• G Only: allows WiFi clients to connect using only the 802.11n protocol.
• B/G Mixed: allows clients to connect using either 802.11b or 802.11g protocols.
• N only: allows clients to connect using only the 802.11n protocol.

These apply only to the 2.4 GHz band interface. any 5 GHz interface will have separate Mode settings.

SSID: is the network name (Service Set IDentifier) for the 2.4 GHz WiFi interface. For security, you're advised not to include personal words that may indicate your identity, address, location, or equipment type. For example, “HELENLIUNG” would be a poor choice, unless you want everyone nearby to know who owns the network. Single dictionary words also make for very poor security.

(Default: FreshTomatoXX, where “XX” is the two numbers in the band.) For example, on the 2.4 GHz network, the default SSID is “FreshTomato24”.

Broadcast: enables SSID broadcasting. This “announces” the SSID on the air, so it's easy to find and connect to. Some argue that disabling SSID Broadcast provides more security. However, SSID names are easily sniffed using common software. Disabling them provides no real security increase.

Channel: the channel on which the 2.4 GHz radio interface will operate. Generally, choose a different channel than your neighbours are using. (Default: Auto).

• Auto*: This default is generally safe unless there's significant interference from other nearby equipment.
  FreshTomato chooses and uses the channel it believes has the least interference.
• Channel: lets you manually choose available channels on the band. Unavailable channels won't appear.
  
  

Channel Width: lets you choose the width of the channel (in terms of frequency).

• 20 MHz
• 40 MHz

802.11n can use 40 MHz channel width, but to maintain legacy compatibility, it uses one main 20 MHz channel plus a free adjacent channel 20 MHz above or below the main channel.

Control Sideband: lets you choose whether the extra sideband channel used is above (Upper) or below (Lower) the main channel used. (Default: Upper). This is only available If 20 or 40 Channel Width is selected.

• Upper *
• Lower
  
  

Security: lets you select the security protocol used on the 2.4 GHz WiFi interface.

• Disabled: disables security entirely, leaving the network open to anyone.
  Avoid using this. It is a basically an unlimited security risk.

• WEP: enables Wired Equivalent Privacy protocol. Avoid using this. It's obsolete
  due to
  serious vulnerabilities, including weak encryption.

• WPA Personal: enables WiFi Protected Access Protocol 1.x.
  • Uses the RC4-based TKIP protocol.
  • Lets hosts exchange pre-shared keys, for more security.
  • More secure than WEP, but weaknesses include lower encryption standards.
  • WPA2 is strongly encouraged instead.

• WPA Enterprise: (AKA: WPA-802.1X). This is similar to WPA Personal,
  but each user has his/her own username/password.
  • No common pre-shared key is used.
  • Doesn't require a RADIUS server. Often, one is used anyway for
    legacy compatibility and security.
  • Is more secure against dictionary attacks on short passwords.
  • Is suitable for larger, more formal networks.

• WPA2 Personal: WiFi Protected Access version 2 uses parts of 802.11i.
  • Supports mandatory AES encryption, so is much more secure than old protocols.
  • WPA2 Personal is recommended for small- to mid-sized, informal networks.

• WPA2 Enterprise: This enables the Enterprise version of WPA2.
  • Uses WPA2, but each user has their own WiFi username/passkey.
  • Is based on parts of 802.11i.
  • Doesn't require a RADIUS server. Often, one is used anyway for
    legacy compatibility and security.
  • Is appropriate for larger, more structured networks.

• WPA / WPA2 Personal: Enables both protocols.
  The router will communicate
  via whatever it detects from the client.

• WPA / WPA2 Enterprise: Enables both protocols.
  The router will communicated
  via whatever it detects from the client.

• RADIUS: Enables Remote Access Dialup User Service.
  • This is designed for larger organizations.
  • This uses a separate server to authenticate/permit/keep track of users.
  • This supports authentication via certificates to ease user management.
  • This is usually only for advanced users.
    
    

Shared Key: the key to authenticate WiFi clients on the LAN. Asterisks are shown until you insert the cursor.

Group Key Renewal: sets how often encryption keys used between clients and router are rotated.
This is a part of the WPA protocol. (Default: 3600 seconds = 1 hour).

The following limits apply to adjusting key rotation interval:

• Release 2023.5 and later: From 1 second to 2592000 seconds
  [for ARM-based and MIPS RT-N / MIPS-RT-AC hardware]
  Where: 0 = disabled (not advised).

• Releases 2023.4 and earlier: The limits for all hardware were: 60 seconds to 7200 seconds.

The Wireless (5 GHz) section displays settings and information for the 5 GHz WiFi network interface.

Your device may show a different device name than eth1. FreshTomato hardware device numbers begin at 0.

For example,

• The first Ethernet device might be called “eth0”.
• The second wireless device might be called “wl1”.

Typically, the 5 GHz WiFi band has higher bandwidth, but shorter range than the 2.4 GHz band.

Enable Wireless: Checking this turns on the 5 GHz WiFi interface. When unchecked, the 5 GHz WiFi interface is turned off.

MAC Address: This displays the MAC (hardware) address of the 5 GHz WiFi interface.
Clicking on the MAC address takes you to the MAC Address page, where you can choose your own MAC address for this interface.

Wireless Mode: This lets you choose the wireless mode (function) of the 5 GHz WiFi interface.

Wireless Network Mode: lets you choose which 802.11 WiFi protocols are available to clients.

• Auto - FreshTomato/WiFi clients automatically negotiate the best WiFi protocol.
  • This is recommended unless you're highly experienced with WiFi.
  • Compatibility issues may occur. The most “logical” setting isn't always the best.
• A Only - allows WiFi clients to connect using only the 802.11a protocol.
• N Only - allows WiFi clients to connect using only the 802.11n protocol.
• N/AC mixed - allows WiFi clients to connect using only 802.11ac or 802.11n.
• AC Only - allows WiFi clients to connect using only the 802.11ac protocol.

Note that only releases 2021.8 and later have have a separate setting for 802.11ac.

Any 2.4 GHz band interface will have separate Mode settings. See the 2.4 GHz section. (Default: Auto)

SSID: the network name of the 5 GHz WiFi. For security, don't include personal words/phrases indicating identity, address, location, or equipment type. “HELENLIUNG” is a poor choice, unless you want everyone to know who owns that network. Single dictionary words make for poor security.

(Default: FreshTomatoXX, where “XX” is the digits in the band.) For example, on a 5 GHz network, the default SSID is “FreshTomato50”.

Broadcast: enables SSID broadcasting. This “announces” the SSID on the air, so it's easy to find.

Some argue disabling SSID Broadcast provides more security. However, SSIDs are easily sniffed with common software, so disabling SSID Broadcast provides little increase in security.

Channel: Selects the channel on which the 5 GHz radio interface will operate. (Default: Auto).

Generally, you should choose a different channel than the one your neighbours are using.

• Auto: This default is generally safe unless there's significant interference from nearby equipment.
  • FreshTomato selects and uses the channel it believes has the least interference.
• Channel: lets you manually choose from available channels on the band.
  Unavailable channels won't appear.
  
  

Channel Width: allows you to choose the width of the channel (in terms of frequency).

• 20 MHz
• 40 MHz
• 80 MHz
• 160 MHz (not yet supported. May be supported on some SDK714 models)

20 MHz channels on the 5 GHz band have no overlap, so the 5GHz band is less prone to interference and noise. Larger channel widths provide more speed/bandwidth if there's low interference.

Interference is more common on the 2.4 GHz band. It's usually fine to choose a wider channel width here. However, if you see slowdowns or trouble authenticating/associating with the router, you may need to use a narrower channel width.

802.11n can use 40 MHz channel width. However, to maintain legacy compatibility, it uses a main 20 MHz channel plus a free adjacent channel 20 MHz above or below the main channel.

Control Sideband: lets you choose whether the extra channel used is above (Upper) or below (Lower) the main channel being used. (Default: Upper). This is available only if 40, 80 or 160 MHz Channel Width is selected.

Security: lets you select the security protocol to be used on the 2.4 GHz WiFi interface.

• Disabled: disables security entirely, leaving the network open to anyone. Avoid this.
  • This is a basically an unlimited security risk.

• WEP: enables Wired Equivalent Privacy protocol. Avoid using this.
  • Obsolete due to serious vulnerabilities, such as weak encryption.

• WPA Personal: enables WiFi Protected Access 1.x (with RC4-based TKIP protocol).
  • Lets hosts exchange pre-shared keys, for more security.
  • Is more secure than WEP, but has weaknesses like low encryption standards.
  • Is strongly encouraged instead of WPA.

• WPA Enterprise: (AKA: WPA-802.1X). similar to WPA Personal, but each user has
  their own username/password.
  • No common pre-shared key is used.
  • Doesn't require a RADIUS server.
  • Is more secure against dictionary attacks on short passwords.
  • Is suitable for larger, more formal networks.

• WPA2 Personal: uses elements of the 802.11i standard.
  • Supports mandatory use of AES encryption. More secure than old protocols.
  • Is recommended for small/mid-sized informal networks.

• WPA2 Enterprise: enables the Enterprise version of WPA2.
  • Uses WPA2, but each user has their own username/passkey.
  • Is based on parts of 802.11i.
  • Doesn't require a RADIUS server.
  • Is appropriate for larger, more structured networks.

• WPA / WPA2 Personal: uses WPA2 Personal, and if that fails, WPA security.

• WPA / WPA2 Enterprise: uses WPA2 Enterprise, and if that fails, WPA .

• RADIUS: enables Remote Access Dialup User Service.
  • Is designed for larger organizations.
  • Uses a separate server to authenticate, permit and keep track of users.
  • Supports authentication via certificates, for easier user management.
  • Suitable for advanced users.

Shared Key: the shared key to authenticate WiFi network clients. Asterisks display until you click your cursor.

Group Key Renewal: sets how often encryption keys used between clients/router are rotated. This is part of the WPA protocol.

(Default: 3600 seconds). See the first wireless radio unit for more details.

Specifically, enabling this option does the following:

# 2018-01-19
# Reduce and flush the route cache to ensure a more synchronous load-balancing across multi-wan
# https://vincent.bernat.im/en/blog/2011-ipv4-route-cache-linux
 
/bin/echo 1 > /proc/sys/net/ipv4/route/flush
/bin/echo 1 > /proc/sys/net/ipv4/route/secret_interval
/bin/echo 0 > /proc/sys/net/ipv4/route/min_delay
/bin/echo 1 > /proc/sys/net/ipv4/route/max_delay
/bin/echo 1 > /proc/sys/net/ipv4/route/gc_interval
/bin/echo 1 > /proc/sys/net/ipv4/route/gc_elasticity
/bin/echo 1 > /proc/sys/net/ipv4/route/gc_min_interval_ms
/bin/echo 0 > /proc/sys/net/ipv4/route/gc_min_interval
/bin/echo 1 > /proc/sys/net/ipv4/route/gc_thresh
/bin/echo 1 > /proc/sys/net/ipv4/route/gc_timeout
 
#Causes connectivity issues if this value is too small, use defaults or tune accordingly
/bin/echo 512 > /proc/sys/net/ipv4/route/max_size

Support for Baby Jumbo Frames is included since release 2021.3. It works only on gigabit routers. Not all ISPs support Jumbo Frames for PPPoE (RFC 4638).

To enable Baby Jumbo Frames:

• Go the Miscellaneous menu. Check Enable jumbo frame support .
  The router will reboot.
• In the Network menu, Set MTU to manual, and enter an MTU of 1500
  for PPPoE operation. (Usually, packet size will be 1492).
• Clamping can be manually disabled, if needed.
  Type nvram set tcp_clamp_disable=1
  at a FreshTomato command prompt).
• Ping with packet size of 1472 to verify you have a working PPP MTU of 1500.

This example shows the default parameters to steer clients from the 2.4 GHz band to the 5 GHz band:

Steer Policy:
max=0 period=5 cnt=3 rssi=-52 phyrate_high=110 phyrate_low=0 flags=0x22 state=3
Rule Logic: OR
RSSI: Greater than
VHT: Allowed
NON VHT: Allowed
NEXT RF: NO
PHYRATE (HIGH): Greater than or Equal to
LOAD BALANCE: NO
STA NUM BALANCE: NO
PHYRATE (LOW): Less than
N ONLY: NO

This example shows default parameters to steer clients from the 5 GHz band to the 2.4 GHz band:

Steer Policy:
max=80 period=5 cnt=3 rssi=-82 phyrate_high=0 phyrate_low=0 flags=0x20 state=2
Rule Logic: OR
RSSI: Less than or Equal to
VHT: Allowed
NON VHT: Allowed
NEXT RF: NO
PHYRATE (HIGH): Greater than or Equal to
LOAD BALANCE: NO
STA NUM BALANCE: NO
PHYRATE (LOW): Less than
N ONLY: NO

For more details, see:
Smallnetbuilder.com: Asus RT-AC3200 Smart Connect-the Missing Manual