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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