How many computers are connected to the same router, why do some have Internet access and can't open Web pages

The first thing to be sure is that the work of the router is normal, and this usually happens because of the following situations:

1 The IP Address, gateway and DNS of this computer are not set or set incorrectly;

2 The firewall in the router will be the computer's IP or MAC address filtered out, resulting in this computer can not normal Internet;

3 Some viruses on the computer can also lead to the normal opening of the Web page;

4 hardware failure such as network card, network cable and other problems.