What should I do if my centos system cannot connect to the external network?

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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