What should I do if CentOS cannot access the Internet?

What to do if CentOS cannot access the external network

The solution to the problem that CentOS cannot access the external network is as follows:

1. Check Routing

# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 ens33 169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 ens33 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 ens33 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0

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If you are missing the first route, you will definitely not be able to ping the external network

2. Add dns

# vim /etc/resolv.conf nameserver 8.8.8.8

3, add route

# route add default gw 192.168.0.1

4, restart the network card

service network restart

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