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RT-AC86U AiMesh with RT-AC66U bridge

Discussion in 'Asuswrt-Merlin' started by mymatenige, Mar 27, 2020.

  1. mymatenige

    mymatenige New Around Here

    Oct 29, 2018

    I have the following set up:

    RT-AC86U AiMesh Router (Merlin 384.15)
    RT-AC86U AiMesh Node (Merlin 384.15)

    connected over wireless.

    Then two RT-AC66U connected to the mesh via wifi acting as media bridges. Merlin LTS 374.43 41EA.

    I'm finding that AiMesh is stable for all clients, but occasionally the RT-AC66U bridges become unstable. If they lose connection to the mesh they sometimes don't reconnect at all, and when they do I often find that the data flow only works one way. I suspect that they are bouncing across the mesh devices. I've had a dig on the forums and found a number of suggestions around Beaming, MIMO, RSSI and Roaming Block List but nothing seems to fix the instabilbity. The problem still reappears, sometimes after hours and sometimes days.

    Does anyone have any other ideas / pointers of things that I can explore ...

  2. markus987

    markus987 New Around Here

    Jun 25, 2017
    I am also using the RT-AC66U in media bridge mode. In my opinion the media bridge mode has some bugs. For example it is running a dnsmasq service for reasons unknown to me. I have observed with wireshark that after a while the media bridge responds to dhcp queries form clients connected via ethernet. The dhcp responses include the ip of the media bridge for both dns and default route. These dhcp responses disconnect connected ethernet devices form the internet (until i rebooted the media bridge).

    At the moment I use the following settings:
    - media bridge connected via 5ghz band, channel 36, 5ghz band with default settings
    - static ip and dns server on media bridge
    - dhcp lease time set to 7days on my main router
    - newest asus firmware on media bridge

    It works stable at the moment. I think the increased dhcp lease time fixed some of the disconnect problems that I had before.
    Last edited: May 27, 2020
  3. mymatenige

    mymatenige New Around Here

    Oct 29, 2018
    Thanks for this. I'll give what you suggest a go and see if it improves. I'll update the thread with my findings.