Ubuntu KVM host network problems

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After my previous article is completed, there will be some strange phenomena:

1. After logging on to the host through SSH from other machines, the connection will not be available after a while, and then SSH will not be able to log on until the network service of the host machine is restarted. (It has been found that the company's network conflicts with the IP address of another machine)

2. The host machine cannot connect to the Internet.

3. This row is missing from the routing table:

IP Route list

Default via 10.112.18.254 Dev br0

Reference solution: http://askubuntu.com/questions/179508/kvm-bridged-network-not-working

Run the following command once:

Sudo dhclient br0 &

After this command is executed, the missing route rule is automatically added.

Now it is normal.

This situation is not encountered in another network environment. After Ubuntu is installed, KVM is installed. No problem occurs after the NIC is set. Therefore, it is estimated that the previous problem is caused by incorrect IP addresses and incorrect gateway settings.