SOLVED: Any known issues with WiFi on RT-N12 and Shibby 140?

Discussion in 'Tomato Firmware' started by haertig, Jan 1, 2018.

  1. haertig

    haertig Serious Server Member

    Are there any known issues regarding WiFi stability on an ASUS RT-N12 (D1 hardware revision, recently purchased) and Tomato Shibby "tomato-K26-1.28.RT-N5x-MIPSR2-140-Max"?

    I have had several WiFi drops. This is to a laptop that to the best of my knowledge has never dropped any WiFi connection to any router it's even been connected to - often times left connected for days and days. The RT-N12 is only a few feet away, unobstructed view to the laptop, signal strength is excellent. Operating on 2.4GHz (the only freq band the RT-N12 is capable of), Channel 1, 20Mhz channel width.

    Before flashing Tomato, I connected the laptop to the OEM WiFi of the router and left it up overnight, checking for stability. This was not a long test, just overnight. But it stayed stable. Now after flashing Tomato, it sometimes drops several times a day, but sometimes will stay up overnight. I have not been able to do exhaustive testing yet, but this is what I'm initially seeing. Now that I've already flashed Tomato and the OEM software is no more, it is harder to determine if I have a router hardware problem, or a firmware problem.

    I am going to test some with other clients. Lord knows I have enough things that connect to WiFi in my house to test with. I will also try with channels 6 and 11, but I really wanted to use 1 on this particular router (it's an AP only) due to strong signals on 6 & 11 around my house (my main router uses 6 and my security system uses 11). Part of my troubleshooting is asking here on these forums, to see if there are already known issues with my particular hardware/firmware combination, because if a problem has already been uncovered, no need in my doing all the troubleshooting from scratch again.

  2. eibgrad

    eibgrad Network Guru Member

    I have several RT-N12 (D1) routers, most in the lab. I've never noticed a problem, then again, I'm usually using dd-wrt for those routers. Make sure you always do a factory reset (Restore Default Configuration w/ erase all NVRAM) after updating the firmware. If you don't, this can sometimes lead to very strange (and almost impossible to diagnose) problems due to artifacts from the previous firmware.
  3. Sean B.

    Sean B. LI Guru Member

    The settings under Advanced->Wireless can cause issues. Research the functions and determine how they relate to/can affect your clients. Initially I'd suggest to disable APSD, as often times power saving implementations end up not fully compatible, resulting in client drops.
  4. haertig

    haertig Serious Server Member

    Oddly enough, I have just let this thing sit, untouched, and the WiFi connection has been perfectly stable for the last 2 days. The laptop connected to the RT-N12 hs been moved from "a few feet away" to about 30 feet away, down a hall where there are two exterior walls diagonally obstructing (the corner of the garage is now injected between the laptop and the RT-N12 down the hall). So the WiFi connection seems MORE stable at this new lesser signal position than it was when only a few feet away. I do have two other routers in the house, but one of those is on channel 6 and the other on channel 11. This RT-N12 is on channel 1. The laptop is now about 4 feet way from both the channel 6 and channel 11 routers, so those signals are at max (but not on the same channel 1 as the RT-N12 in a different room).

    I had already done a thorough erase of the NVRAM immediately after flashing the Tomato firmware.

    I did research the Tomato advanced WiFi settings, and have a plan of attack to change some of those should the WiFi connection start dropping again. But as of right now, it's decided to behave. No idea what has changed.

    We don't have conflicting radio devices in the house that would have been running interference before. A portable bluetooth speaker exists, but it hasn't been used since I got the RT-N12 (hasn't even been powered up).
    Last edited: Jan 3, 2018
  5. Sean B.

    Sean B. LI Guru Member

    Having transceivers too close to each other will most certainly cause connection drops. The power of the signal at that range can/will overload the receiver, making the data indistinguishable from noise.
  6. haertig

    haertig Serious Server Member

    Maybe that was it then. I have other devices (different laptops, Android tables, cellphones, etc.) that connect to my other routers and are usually quite close to them. However, those other devices are set to "automatically connect" to these other routers. So if indeed they drop a connection, they probably re-establish it quickly enough that I don't notice.

    But my test laptop, connecting to my new RT-N12 router, is NOT configured to "automatically connect". So quite possibly it may be experiencing no more drops than anything else that is too close to its access point, but those drops are quite noticeable because it doesn't automatically reconnect.

    This sounds like a good working theory for me to move onward with in my subsequent testing.

    Sean B. likes this.
  7. haertig

    haertig Serious Server Member

    The WiFi connection has been perfectly stable for over 5 days now. So I'm going to write off my initial drops as "Unknown, but probably due to being too close to the AP".

    Thanks for the help everyone!
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