Question Lan connection weak in router, but full speed in modem

[Jamesrn95]

I connected my lan cable from my PC to my router and i was getting like 500kb/s download speed, but as a direct into my modem I'm getting a full speed of 20mb/s while downloading. Any suggestions?

 

[helpstar]

Did you download more than once the same file?

check the cable connection between router and modem
Which router is it?