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Router stops doing wireless

Discussion in 'Tomato Firmware' started by jaydeflix, Jul 7, 2011.

  1. jaydeflix

    jaydeflix Networkin' Nut Member

    Tomato 1.28 on Linksys WRT54G/GS/GL

    I find that, at random times, I need to reboot the router as it suddenly drops all wifi connectivity.

    I *think* it may self-repair after a few hours (as I've seen it stop working from my ipod touch as I went to bed, and it works in the morning) but 'a few hours' isn't short enough when you're in the middle of doing things.

    So, I'm looking for some troubleshooting suggestions for how to find what might be wrong.

    No QoS settings, no microwave/wireless phones in the house. Based on the channel scan, I'm alone on Channel 9.

    No scripts, no scheduled tasks (well, there is no, one to restart every day at 0315 now, in case it is just a 'system gets tired' thing).

    I don't have a schedule as to when it happens, how often, at what times, or anything. I haven't tested to see if it maintains wired connections yet (only a game system and a headless server are hardwired) so that's one thing I plan on checking next time it happens.

    I'm just looking for any recos as to how to troubleshoot this from the router pov.
     
  2. Always-wondering

    Always-wondering Networkin' Nut Member

    This has happened to me - though very rarely. (I have a lot of outddor access points). Depending on how accessible the equipment is, I would choose one or both of the following two things. 1.Consider 'coordinating your channel" with your neighbor (s). There really is only adequate separation between 1 - 6 -11 (US). I would rather go to one of the aforementioned channels, that seemed to be quiet 2 channels up and/or down (even if it meant sharing) - then to insert myself between two strong signals. (If you do some digging on this forum, you will find a post by Toastman, that explains the philosophy of coordination vs. separation). I (might/should) take the time to run a few noise-floor scans... Numbers below (<) 92dBi would be a red flag for me. - If you find low values, I'd definitely start channel surfing. 2. Barring success there, one can choose the "Nuclear" option: Clear the NVRAM (Admin>Configuration>Restore Default Configuration> select:Erase All Data......). This will return you to the default settings in Tomato. Generally @ this point, I go ahead and actually reload the virgin (Tomato) firmware. - As there is nothing (configuration-wise) left to lose. Then go back once it's reloaded, clear the NVRAM again. -Reload the configuration...... and test.
     
  3. jaydeflix

    jaydeflix Networkin' Nut Member



    ast Seen SSID BSSID
    RSSI
    Noise
    Quality
    Ch
    Capabilities Rates
    Wed 8:58:54
    NEW (0m) space-magic_EXT A0:21:B7:7A:97:0E
    -86 dBm​
    -99 dBm​
    13 [​IMG]
    11​
    infra wep
    shortslot 1,2
    5.5,6,9,11,12,18,24,36,48,54
    Wed 8:58:54
    NEW (0m) toystory3 00:21:00:4E:91:5F
    -97 dBm​
    -91 dBm​
    0 [​IMG]
    1​
    infra wep
    shortslot 1,2,5.5,11
    6,9,12,18,24,36,48,54
    Wed 8:58:54
    NEW (0m) KahunaNet 00:16:B6:41:A1:B8
    -85 dBm​
    -92 dBm​
    7 [​IMG]
    6​
    infra wep
    shortslot 1,2,5.5,11
    6,9,12,18,24,36,48,54
    Wed 8:58:54
    NEW (0m) DDL Supernet 00:1A:70:49:1E:9D
    -80 dBm​
    -92 dBm​
    12 [​IMG]
    6​
    infra wep
    shortslot 1,2,5.5,11
    6,9,12,18,24,36,48,54
    Wed 8:58:54
    NEW (0m) linksys 00:1A:70:81:BD:A7
    -91 dBm​
    -92 dBm​
    1 [​IMG]
    6​
    infra
    shortslot
    1,2,5.5,11
    6,9,12,18,24,36,48,54


    The noise check I just did had us a -91 dBm and we're on channel 11 (although I've seen the noise floor range from -91 to -98.) (and now, hours later, it's back to 98).

    Also, last time I checked, about when I made the original post, I was alone on 11 (and I have no idea what happens when the problem actually occurs. The above is how it looks right now and things are hunky dory.

    Is there anything you'd think I could log so that I could see when it happens that I might not be home to notice to get a gauge for how often the problem actually happens?

    If I could repro the problem, testing would be far less of an issue. This is more of a 'It happens when it happens' timing.
     
  4. Toastman

    Toastman Super Moderator Staff Member Member

    Don't forget that you can only "see" other wifi transmissions. You can't see bluetooth/baby monitors/phones/wireless security cameras/radar - and the worst one of them all that usually occurs mostly on the top end of the band (CH11) - which is microwave cookers. One of my clients had all channels wiped out by a baby monitor in the house next door - about 1m from his router on the other side of the wall. My own microwave cooker, on top of my fridge, is about 24" from the guy next door's PC. It's easy to see why these mysterious problems are not easily resolved! Quite probably, every time I warm something up, he loses his internet ...

    You can also get problems with other wireless clients screwing up the router - the mechanism why it does this is unknown, for example, I have seen chinese made mobile phone "copies" trying to log onto a router to knock it off air.
     
  5. Always-wondering

    Always-wondering Networkin' Nut Member

    There really isn't too much that one can do w/the router(s) to query "why did the disconnect happen". -For me at least, I handle oddities as I mentioned above. -Though when stumped, I have additional spare routers to substitute with. There is one last scenario that I contend with - that being (very likely) thunderstorm/lightening damage. (Florida likes to bill itself as the 'lightening capital of the world). Routers start to behave unpredictably / coincidentally after local lightening shows. - The symptom post-storm is usually irrevocable damage to the router's WAN portion. - Oddly, computers can 'see' the network - but cannot connect. -Even odder is that though the AP mode is non-functional, the subject routers will perform reliably as Client-Bridges.
    As Toastman points out, the software driving the (computers/routers wireless only reports 'specifically' on wireless networks I have always assumed that 'everything else' gets lumped into "Noise". I have had sporadic disconnects (read : COMPLAINTS), that if I get to quick enough, have actually produced noise floor readings as poor as 62. -They are infrequent - and transient. As this is a sort of hobby for me - I apologize, generally shift the channel, re-check, and explain to people that only more sophisticated equipment (like http://www.metageek.net/products/) can narrow down the culprit(s) - and even with that (all that $$ spent), it doesn't 'fix' anything - just lets you know what shape to make the voodoo doll into, so you can stick pins in it.............
     
  6. careh

    careh Networkin' Nut Member

    Did you run inSSIDer to look for the wireless signal? I just encountered a similar problem with a Cisco linksys e2000 router. I posted on the QOS thread by toastman as I am using QOS in the router and running in WDS mode.... My router and access points are on G only channel 11. There are no other routers near.
     

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