How to tell if my packet loss and high ping is a result of my router or a poor ethernet cable?

[a2242364]

So when I connect my pc directly to my modem via an ethernet cable, I get no lag and ping spikes. However, when I connect through my router, my ping would skyrocket and would occasionally get packet loss as high as 18%. My router is DLink DIR 615. Is it because this router is extremely outdated, or because my ethernet cable is broken?

[Guest]

How are you connecting through your router? Wifi?

And how does the modem connects to the router?

[a2242364]

5 minutes ago, deXxterlab97 said:

How are you connecting through your router? Wifi?

And how does the modem connects to the router?

im not teksavvy so can't really explain. i took some pictures a few days ago when someone else was trying to help me https://imgur.com/a/re7jf

 

 

that yellow cable connects my router to my modem. 

[iLLpaign]

Reboot your router if you haven't already. Swap ports on the back of the router/switch (grey cable). If you still see packet loss, replace each cable (grey and yellow) one at a time and test for packet loss each time.