Linux cannot ping the gateway and other IP addresses

Background:

There is a Linux test server. It seems that some changes were made to it from a security perspective, which caused it to only work with When communicating on the same network segment of the intranet, the addresses and gateways of other network segments cannot be pinged.

Solution:

1. First, setup and check that the IP address, gateway, and DNS are all fine.

2. You can ping your own IP, and you can ping IPs in the same network segment, but you can't ping IPs in any other network segment and the external network.

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3. Clear routing information

ip route flush dev eth0

4. Restart network service

service network restart

5. Then everything becomes smooth.

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