Mobile phone wifi keeps preferring 2.4 over 5Ghz

Discussion in 'Tomato Firmware' started by rs232, Sep 28, 2018.

  1. rs232

    rs232 Network Guru Member

    I have a Samsung Galaxy S9+ and for some reason it keeps preferring 2.4GHz over 5GHz. It appears like Android Oreo has removed the preferred frequency option so I'm now looking at my router to see if anything can be done.

    I have the same SSID for 2.4 and 5 and need both 2.4 and 5 enabled. I could change SSID for 5GHz I suppose but it feels wrong somehow... can you think of a way to apply a sort of wireless client filter on 2.4 only? Or anything else that would achieve this without having multiple SSID?

    Thanks :)
  2. monoton

    monoton Serious Server Member

    Lowering Transmit Power for the 2.4GHz band to something between 25 and 32 is an option.
    Perhaps even lower depending on the area.
  3. koitsu

    koitsu Network Guru Member

    I've run into this problem on other firmwares and equipment (read: Ubiquiti) when using the same SSID for both bands (2.4GHz and 5GHz). You'll find people on the UniFi forum talking about this problem as well.

    The only way I've found to reliably stop this from happening is to have separate SSIDs for each band. It's actually the easiest method, too.

    Otherwise you end up trying to figure out weird tweaks/quirks/whatever on a per-client-device basis to get it to "prefer" 5GHz over the other, and those don't always work, or they aren't available/possible.

    I suggest adding "24" and "5" at the end of each SSID per band, respectively. Go with whatever you want though.
    Techie007 and cloneman like this.
  4. ruggerof

    ruggerof Network Guru Member

    Agree. This is what I do. All my 5GHz capable devices have only the 5GHz SSID in their memory.
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