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Disable 11B Data Rates

  • 1.  Disable 11B Data Rates

    Posted Aug 27, 2019 09:46 AM
    I have a FortiGate 60E with a single Access Point 221B.  I'm trying to perform a test to determine if a certain product supports a set of data rates or not.  To this end, I would like to disable the 802.11B data rates 1, 2, 5.5, and 11 Mbits/sec.  

    I understand there's a way to do this using the CLI, and after logging into the FortiGate unit I clicked on the icon to open up a CLI interface.  I then typed in the following:

    config wireless-controller vap
    edit <vap_name>
    set rates-11bg 12-basic 18 24 36 48 54

    This seemed to take, and I was able to verify it with the show command.  However, it seems the unit still responds on the 11B data rates.  I then tried the following using the CLI, also to no avail:

    config wireless-controller wtp-profile
    edit <name>
    config radio-1
    set powersave-optimize no-11b-rate

    Would anybody have any ideas what I'm likely fundamentally missing here?!  Is a reboot required?!  Is there some type of "Apply" button to have these changes take effect that I'm missing?!  Or is my licensing somehow insufficient?!  I'm at a loss to explain why the commands take and the settings persist, yet don't seem to actually take effect.  

    Any insights are greatly appreciated!

  • 2.  RE: Disable 11B Data Rates

    Posted Aug 27, 2019 12:19 PM
    Hi John,
       What version of FortiOS are you running?

       You will additionally need to change the VAP-profile to be n-only (or n/g) if you want to prevent 11b rates from operating.

  • 3.  RE: Disable 11B Data Rates

    Posted Aug 29, 2019 07:25 AM
    Thanks much for this.  I tried it with g only, n-only, and n/g but to no avail.  
    It's also odd in that all these settings I've tried to change seem to "take" but don't seem to ever get "applied."

    The FortiOS version is 5.4.

  • 4.  RE: Disable 11B Data Rates

    Posted Aug 29, 2019 02:07 PM
    Thanks John.

    I'm assuming that you're using a packet sniffer / wireshark to verify that the beacons are still going out at 1Mbps?  If you're continuing to have issues, please direct send me your contact info and I can ask someone to reach out to debug with you directly.

  • 5.  RE: Disable 11B Data Rates

    Posted Aug 29, 2019 03:43 PM
    Hi John,

    As per your config, you have 11Mbps enabled, set-rates-11bg is 11Mbps, which is a B rate. OFDM starts at 6Mbps, then 12,18,24 etc. Not 11.

    config wireless-controller vap
    edit <vap_name>
    set rates-11bg 12-basic 18 24 36 48 54

    It appears you're making changes at just the SSID level. Hence if you have multiple SSID's configured the easiest way to make this change is at the radio level.
    As Chris has said enabling g/n mode at the radio level should work. This is generally set in the AP <wtp-profile>. Please see below for the radio-2 config set in the FAP-221B profile using.

    FortiGate# config wireless-controller -profile
    FortiGate(-profile) # edit FAP-221B
    FortiGate(FAP-221B) # show
    config wireless-controller -profile
    edit "FAP-221B"
    set handoff-sta-thresh 30
    set https ssh
    config radio-1
    set band 802.11n-5G
    set channel "36"
    config radio-2
    set band 802.11n,g-only
    set channel "1"

    Please try this. I would also suggest deleting and recreating your SSID <vap> just in case the changes made to the basic rates override the radio profile.

    Kind Regards,

    CSE - Wireless APAC
    Sydney | Australia
    CWNE #327