• Cause:

    The flat network service provider provides DHCP services and therefore occupies an IP address.

  • Solution:

    If you do not want to use the DHCP service, you can delete the corresponding L3 network. However, the IP address occupied by the flat network service provider will not be released. You can use the following method to reclaim the IP address and eliminate the corresponding impact.

    Run the following commands in all hosts:
    1. Run the ip netns command.
    2. Run the ip netns delete xxxx command for all output namespace. Note that xxxx is the namespace in the output of Step 1.
    3. Run the ebtables -F command.
    4. Run the pkill dnsmasq command to kill all DHCP servers.