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The Setup

I've got a SB6141 cable modem connected to a NETGEAR N600 Dual Band Wi-Fi Router (WNDR3400) and am on the comcast deluxe50 business plan (50Mbps up 10Mbps down). Wifi set up is pictured here.

The speed tests

Consider the speed test results pictured here.

  1. The first result is when my ubuntu laptop is connected directly to the cable modem.
  2. Second result is when I am on Wifi (The 2.4GHz b/g/n network).
  3. The third result is when I am connected to the wifi router by an ethernet wire.

Questions

  • What explains the above?
  • How can I get the full 50Mbps speed on wifi?

Edits

  • After I upgraded the firmware following a suggestion below (I used NETGEAR V1.0.0.52_20.0.60, not ddwrt), I now get full speed with the wired connection to the router. Wifi speed still sucks though.
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  • This is an ethernet router right? Connected to the modem via ethernet right? Or is it a DSL router that you replaced your modem with? (If it's the latter it could simply be an ADSL2+ router and you need a VDSL router to get that speed)
    – Cestarian
    Commented Feb 2, 2016 at 5:19
  • More than just the wifi changed, it looks like the routing path changed too. Does the speed go back up when you plug it back into your laptop directly?
    – Paul
    Commented Feb 2, 2016 at 6:04
  • Retry all three tests until you get the same IP address for each of them, six times in a row (very rapidly); let's try and recude the chances of ComCast doing rate limiting or other environmental factors changing.
    – Anti-weakpasswords
    Commented Feb 2, 2016 at 6:54
  • He wont get that without mac spoofig @Anti-weakpasswords
    – Linef4ult
    Commented Feb 2, 2016 at 6:59
  • There could also be the problem where everyone is on the node you are using so you arent getting the bandwidth you are paying for i know at times my 130mb connection only gets 60 or so sometimes less at peak times.
    – NetworkKingPin
    Commented Feb 2, 2016 at 7:12

1 Answer 1

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The 3400 is quite old but has been reported to be able to saturate its 100Mb port WAN to LAN so it should be working.

The most likely solution is a poor length of cable either between modem and router or router and PC. Wireless performance on 2.4Ghz can be quite low so result #2 is of little consequence.

If you try new cables and it does not work the next culprit is the router itself.

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  • Just checked the ethernet cable I used when connecting with the router - It's all right (it's delivering full speed when connected to the modem)
    – vishvAs vAsuki
    Commented Feb 2, 2016 at 16:51
  • Length of cable doesn't cause this much bandwidth loss (unless you're stretching it across a whole street, at least)
    – Cestarian
    Commented Feb 2, 2016 at 18:23
  • @Cestarian Bad lengths certainly can, even on short runs.
    – Linef4ult
    Commented Feb 2, 2016 at 18:38
  • Dunno, I have a pretty damn long line stretching across my entire apartment, and I'm still getting a full speed of 95mbps (out of 100, not getting 100 because of the wire distance from the router to the station, but close enough), I think it was like an 8m ethernet line, I doubt he has anything longer than that, and since I'm still getting full speed, I bet it'd take something quite a bit longer to really drop the speed even by just 10%, much more for 50%, maybe a 50m line?
    – Cestarian
    Commented Feb 2, 2016 at 18:42
  • I mean I'm literally getting better speeds (and latency) on my 8m cable than my standard 1m cable on tests sometimes, so like I said, unless you're stretching it across the street, or throughout a whole mansion or apartment complex, it probably won't have much of an effect (certainly not from router to computer)
    – Cestarian
    Commented Feb 2, 2016 at 21:11

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