Why does ping affect internet availability?

Question

Computer networks

Router D-LINK DIR-300 - it is also a gateway and DNS server, address 192.168.5.16.
A computer with a built-in Realtek network card. Operating system Windows 7 x64.
Good evening everyone. An unusual problem has occurred.
Access to the local network - to neighboring computers and so on - is stable. Unlike the internet. Namely, access to the router. The Internet does not work on the computer until you run the "ping 192.168.5.16" command. Then after some time, about 15 minutes, it disappears again. Only "ping 192.168.5.16 -t" saves here.
The problem is only one. Happened about a month ago. For a week, this computer has been working in a single quantity throughout the enterprise (usually 12 PCs). There are no matching IPs. If you change the computer's IP address or even try to fake the MAC,

Answer 1

Is the problem on all computers connected to the router or just one? According to the symptoms, it looks like one of the devices does not update the ARP table automatically and simply "forgets" about the presence of the other due to a timeout, and the ping forces the device to write arpa.

Answer 2

Maybe this computer turns off the network interface in order to save power?
Try turning this feature off:

Answer 3

The Internet does not work on the computer until you run the "ping 192.168.5.16" command. Then after some time, about 15 minutes, it disappears again. Only "ping 192.168.5.16 -t" saves here.

One of the possible reasons is the presence in the L2 domain of a host with an IP address that matches yours, or deliberate forgery of arp responses. It is worth observing the state of the arp table on the router. In addition, you can independently (hping, scapy) send an arp request with your ipv4 address as the desired one, see who will respond.