Internet speeds fluctuate wildly

[Revolvelot]

My problem started last Friday, out of nowhere. My internet speed started going up and down constantly, like this:


I wasn't near the computer but was connected through wireless and then went to look what's wrong. I contacted my ISP and they said it is not a line problem. I also ran SG TCP Optimizer and set it for optimal settings, anyway I don't lnow what to do anymore and this kind of problem makes VoiP and online games useless. Can anyone point out what could be the root of the problem? My router is a TP-LINK TD-W8951ND with the latest Firmware installed.

« SpeedGuide.net TCP Analyzer Results »
Tested on: 2014.11.29 05:47
IP address: 109.242.xxx.xxx
Client OS/browser: Windows 7 (Firefox 33.0)

TCP options string: 0204057801010402
MSS: 1400
MTU: 1440
TCP Window: 64400 (multiple of MSS)
RWIN Scaling: 0 bits
Unscaled RWIN : 64400
Recommended RWINs: 64400, 128800, 257600, 515200, 1030400
BDP limit (200ms): 2576kbps (322KBytes/s)
BDP limit (500ms): 1030kbps (129KBytes/s)
MTU Discovery: ON
TTL: 53
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)

[Philip]

You would have to do a few more tests to determine the culprit of the problem.

1) Try to connect via Ethernet cable to your router, to see if it is WiFi related. You can change channels and wireless settings if it is, there may be some interference.

2) Try to run a few traces, and see if there are huge latency spikes at those times when your connection drops.

3) You can try eliminating your router and connecting a PC/laptop directly to your modem (you may have to reboot the modem each time you connect a new device to it).

The above will help determine if the problems are with your router/wireless.

[SamirD]

I'd start with a ping and see if that looks unusual.