In this article we will share some of our foolproof tips for properly configuring your Wifi network, as well as, how to get a better performance on your wireless network using the FortiAP: Access Point Fortinet
About User Density
High density environments always demand special attention. For the FortiAPs of Fortinet, I share the following points and recommendations:
- CPU utilization due to high layer 2 traffic
- Tx power settings
- Avoid interference between channels
- 2.4 GHz (30%) and 5 GHz (70%) split usage
- Avoid low transmission rates (802.11b)
- Enable LLDP
- Use the VLAN pool when available
- Every customer and access point on the same channel competes for time to chat
- All clients and access points on the overlapping channels talk to each other
- Non-802.11 devices compete for medium access
Setting up your ForiAP with 2.4GHz WiFi Channel Allocation
The design of the 2.4 GHz band is always a challenge, problems such as co-channel and high channel usage are common.
Today, the power control of the access point is managed by the FortiGate, when you configure FortiAP profiles, you have the following Radio Configuration screen:
Adjusting Channel Distribution - 5GHz in FortiAP
The 5GHz channel design is easier if you use the 20MHz channel width.
Common Interference Problems Between Wireless Channels
The interference zone can have twice the signal radius and the signal at its edge can be -67dBm.
Reducing co-channel interference on your Fortinet FortiAP
For best results, use a 'honeycomb' pattern as an implantation strategy. The idea is to scale the repeated channels further away from each other to avoid interference.
TXPower - Less is More (better quality)
- Do not abuse high energy levels, only for specific cases like PtP is recommended.
- Try using automatic power control for 2.4 GHz between 4 and 7 dBm and for 5 GHz between 12 and 20 dBm.
- Use more power on 5GHz channels, compared to 2.4Ghz channels. Otherwise, “Band Steering” may not work as expected.
A large proportion of users are still connected to 2.4GHz networks and never connect to 5GHz.
- Remember that the 2.4 GHz wavelength is twice as long as 5 GHz. - 10dBm of 2.4GHz is not equal to 10dBm of 5Ghz - maybe 3 times more!
TX Power Control - Auto or Manual on the AP
- Self - You can set the interval for minimum and maximum dBm power.
- Manual - Choose what percentage of energy you would like to use. The AP will now use the static power output.
Power output: TIP: 2.4GHz - 4dBm to 7dBm 5GHz - 12dBm to 15dBm.
Disable the 802.11b protocol
Disable lower data rates for 802.11a, g, n
FortiAP Channel Allocation - 5GHz
Because Optimize DARRP?
- By default, done every 30 minutes (1800s)
- In large networks with many radios and stations, it can cause a long calculation, and it can also cause multiple channel changes throughout the day. (while the Rogue APs roam)
Important tip: Statically define computing times during periods of low traffic
config wireless-controller timers set darrp-optimize 0
set darrp-day sunday monday tuesday wednesday thursday friday saturday
set darrp-time “22:00” “06:00”
Band Direction at FortiAP - Rádio 1
The 2.4 GHz band is largely “overused”.
- Enabling frequency handoff encourages customers to use 5GHz
- Faster transfer rate
- No interference
- Transmission suppression prevents LAN interfaces from being interrupted by a broadcast storm.
- Broadcast storm occurs when broadcast or multicast packets flood the subnet, creating excessive traffic and impairing network performance.
- Enabling Broadcast suppression will help prevent ARP or DHCP broadcast messages from being transported to other access points with the same SSID.
- Errors in protocol stack implementation or network configuration can also cause a broadcast storm.