The solution of linux's inability to ping gateway and other IP segment addresses

Background:

There is a test server for Linux, which seems to have made some changes to it from a security point of view, so that it can only communicate with the same network segment of the internal network for a long time, and the addresses and gateways of other network segments are ping impassable.

Solution:

1. First of all, setup looks at the IP address, gateway and DNS.

2. Ping's own ip can be ping-connected, and the ip of the same network segment can also be ping-connected, while the ip of any other network segment and the external network cannot be connected with ping.

3. Clear routing information

Ip route flush dev eth0

4. Restart the network service

Service network restart

5. Then all kinds of things are unblocked.

These are the details of the address of the gateway and other IP segments that linux cannot ping. Please pay attention to other related articles for more information.