Can't get 30 Mb d/l on wireless with G router

Discussion in 'Tomato Firmware' started by nomejodas, Apr 8, 2012.

  1. nomejodas

    nomejodas Network Guru Member

    I recently upgraded from a 20 Mb connection to a 30 Mb connection on a WRT54GS router. But I can't reach the full 30 Mb d/l speed on wireless with the WRT54GS. My upload speeds are fine. I tried different firmwares and with shibby ND-1.28.-088 the most I could get was like 14-16 Mb. Victek Tomato_RAF_121006 was like 22 Mb. Official Tomato was around 20 Mb. When I connected the laptop through ethernet I got full speed that way with official and also victek I think. I don't remember if I tried ethernet with shibby but it definitely had the worst wireless speeds.

    Then I tried a D-Link 601 N router that had OpenWRT/gargoyle installed. Now I was able to get max wireless speeds. I thought it might have been the OpenWRT firmware that was giving the full speeds so I flashed the WRT54GS to OpenWRT/gargoyle and tested but it never got past 20 Mb. I also tested the WRT54GS as an access point connected to the D-link and I got about 18-20Mb.

    I also use a Netgear WGR614L router with DD-WRT as an access point. This is a G router and I can't get more than 18-19 Mb with this either.

    Is the issue that I need an N router to get my full d/l speeds? I thought G routers were rated for 54Mbps? Why does the wireless seem to max out at ~20 Mb with all of them?
  2. gfunkdave

    gfunkdave LI Guru Member

    Yes, you need an N router.

    The 54 Mbps quoted for 802.11G is a theoretical maximum that is only possible in a lab, and maybe not even then. In the real world, 11-12 Mbps is the most I've seen. If you were able to get 16 Mbps, that's pretty good.

    Try plugging your computer into the router and you'll see the difference.
  3. maurer

    maurer Network Guru Member

  4. Planiwa

    Planiwa Network Guru Member


    "In June 2003, a third modulation standard was ratified: 802.11g. This flavor works in the 2.4 GHz band (like 802.11b) but operates at a maximum raw data rate of 54 Mbit/s, or about 24.7 Mbit/s net throughput like 802.11a. 802.11g hardware will work with 802.11b hardware. Details of making b and g work well together occupied much of the lingering technical process. In older networks, however, the presence of an 802.11b participant significantly reduces the speed of an 802.11g network"

    "It has been reported that 802.11n interferes with existing 802.11b and g wireless networks. It has also been reported that the range of the 802.11n has reached up to 1/4 of a mile. Interference on this scale is a major setback for 802.11n. "
  5. mstombs

    mstombs Network Guru Member

    Current wireless is also fundamentally half-duplex so only one device can transmit at a time so that 54Mbit/s raw is shared between all users and the router.
  6. Planiwa

    Planiwa Network Guru Member

    Which also explains why using ICMP to estimate data rates tends to underestimate the rates that (mostly) unidirectional downloads might get.
  7. nomejodas

    nomejodas Network Guru Member

    Ok thanks everyone. Now I gotta look for a N router...
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