Need Help with Connecting Access Point to TP Link 3420 running as primary router

[Manoj Mathew]

You're welcome. With stock firmware this would have been a very simple set up but because DDWRT has such a lot of options, it's easy to go awry somewhere.
You may need to fiddle around with the settings to resolve the issues, most probably some packets being dropped due to some settings. Check if there's any packet loss at pingtest.net Also see if the problem exists on all connected devices or just one. You may also need to look at the mtu settings on the router.
Also check by giving static ip on the laptop in the 192.168.1.x series with gateway 192.168.1.1 and with DNS 8.8.8.8 & 208.67.220.220 also defined on the laptop. If the problem persists you could also try going back to the stock firmware.

 

[ghpk]

Thanks again, Stock would have been easy, but DD-WRT is superb when comes to customizing.
yes Earlier I tried all options, by setting laptop on static IP, or auto, and all devices were having speed issues.
But after adjusting MTU to lower value the problem seems to be solved.
But still I see sometimes pings are lagging a lot, may be ISP issue cause same issue even when connecting laptop directly,
connection gave this result last night
https://www.speedtest.net/my-result/3499074742
^ Decent speed for a 512kbps unlimited connection
and now its
https://www.speedtest.net/my-result/3499774043