The solution is as follows:
1. Check the routing
# route -n
If you are missing the first route, It is definitely impossible to ping the external network.
(Recommended tutorial:centos usage tutorial)
2. Add dns
# vim /etc/resolv.conf nameserver 8.8.8.8
3. Add routing
# route add default gw 192.168.0.1
4. Restart the network card
service network restart
Recommended related video tutorials:linux video tutorial
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