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Sudden Slow Down - 2xE2000 Wireless Ethernet Bridge

Discussion in 'Tomato Firmware' started by Xplorer4x4, Mar 25, 2012.

  1. Xplorer4x4

    Xplorer4x4 Addicted to LI Member

    I have run this set up 2xE2000s in a Wireless Ethernet Bridge for over a year, about 1.5 years to be exact(if memory serves me right). I recently, out of the blue noticed that Wireless transfers have dropped from about 8-10MBps to about 5.5MBps. Nothing new has been added to the network full time, the routers have not changed position. Nothing at all has changed but suddenly my transfer speeds drop almost in half! I have not changed firmware in some time, so a recent firmware update is out of the question. Originally I thought maybe it was my HDD on my PC, but I have tried transferring from my Intel X25M G2 SSD and that made no difference. The main purpose of transfer is media to my "NAS" which is an old USB WD MyBook(3 years old?) connected to a WD Live Media Player. The WD MyBook was recently formatted, so that not a problem, and fragmentation on my PCs HDD(2TB WD Cavaiar Green SATA III) is not an issue either.

    Any suggestions how to trouble shoot this?
  2. Toastman

    Toastman Super Moderator Staff Member Member

    If nothing has changed on your system, as far as you know, then the most likely explanation is wireless interference. I think most of us are noticing the huge increase in the number of routers surrounding us, many of them are wireless "N". I have a 300% increase here over the last year.
  3. Xplorer4x4

    Xplorer4x4 Addicted to LI Member

    Hey Toastman, I just flashed your latest stable build on one of my routers last night, and the other is one of your builds from very late last year. Around November I believe. As for interference, I live in a very dense residential apartment complex that if forced to go with AT&T DSL. If you scan for wireless signals 98% of the networks returned are 2WireXXXX which is the default SSID for the 2Wire modem/router combo AT&T sells. The 2Wire units, as far as I know, are not capable of Wireless N. Plus I forgot to mention I am running on the 5 Ghz frequency, not 2.4. I suspect wireless interference is not the problem, as I have also, tried 3 channels in the 5Ghz range with no changes.

    someone suggested I try the app insSSIDer. It did show alot of 2.4 Ghz networks but not one single 5Ghz network aside from mine.
  4. Toastman

    Toastman Super Moderator Staff Member Member


    Maybe this would also be helpful information for many people.

    The 5GHz band is often assumed to be interference-free and a magic cure-all to our problems on 2.4GHz.

    Not so. The band also has its own problems.

    There are 23 channels used in the US but often only 8 are supported in OEM routers. There's a reason for that. 15 channels are for shared use with the military and the router firmwares are supposed to have routines built in that detect such military use and avoid those channels. The chances of this happening are relatively low, but still it might happen, so manufacturers sometimes avoid using them altogether. Quite probably because they know their software kludge isn't gonna help the situation much.

    Let's look at those 8 channels that are left.

    ( full article is at http://tidbits.com/article/10849)

    If the low power use in the lower band is really implemented in the wireless drivers, then best avoid that band unless you need short range only. The upper band is subject to DECT phone interference.
  5. Xplorer4x4

    Xplorer4x4 Addicted to LI Member

    I already dabbled in the channel settings from that guide, and nothing has made any change what so ever.
  6. Toastman

    Toastman Super Moderator Staff Member Member

    This whole business of wireless performance varying is difficult to evaluate. All versions of Tomato have had similar reports, some people say that the OEM firmware's wireless works better, some say just the opposite. I can't offer much help with 5GHz because all our AP's are 2.4GHz only, and I personally have no 5GHz hardware.

    This following thread contains many people's suggestions and reports on wireless topics, I've been trying to move relevant stuff out of other threads and concentrate them all here:


    Maybe you already read though it.

    In your case, if the LAN speed is still identical, wireless seems to be the issue. Then you are fighting this can of worms, where the router and all client wireless may be doing something (we don't know what) because of some condition (which we are not aware of) following some (unknown) algorithm in the (undocumented) wireless drivers. We just don't really know if that's true or not.

    *Something* there has changed, but most explanations fail because they are unlikely to exist on 5GHz. A DECT phone was a good suspect. Radar is unlikely.

    Oh, one red herring that is currently being touted on the forums is sunspot activity. But those peak for just a few minutes and then tail off over an hour or so, and the signal strength isn't sufficient to overcome the rather strong signal from a router, although it might clobber the extremely weak signal from GPS satellites.

    Erasing NVRAM and reconfigure from scratch (or cherry picking from exported settings) usually clears up strange problems in the router, but since you flashed new firmware, I'm sure you did all that stuff already.


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