Connect instance to second_local_net-5 minutes a day to play with OpenStack (85)

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Today is the last section of the local network, and we will verify the connectivity of the two local network.

Launch new instance "CIRROS-VM3", network selection second_local_net.

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The IP assigned to the CIRROS-VM3 is 172.16.1.102.

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The CIRROS-VM3 is schedule to the control node, and the corresponding tap device is tap5395d19b-ed.

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The console shows that CIRROS-VM3 has successfully received the IP address 172.16.1.102 from DHCP.

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But CIRROS-VM3 cannot Ping to CIRROS-VM1.

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This is expected because CIRROS-VM3 and CIRROS-VM1 are located in different local networks and are not connected, even if both are located on the same host.

The network structure is as follows:

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Summary

Here the local network knowledge point has been discussed, make a summary of it.

1. Instance in the same local network can communicate.
2. Instance in different local network cannot communicate.
3. A local network can be located in only one physical node and cannot span nodes.

Although the local network is rarely used in practical applications, the significance of learning local network is:
The local network can be used as a starting point for learning flat, VLANs, Vxlan and more complex network types, reducing the difficulty of Neutron learning.

We will enter the flat network at the beginning of the next section.

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Connect instance to second_local_net-5 minutes a day to play with OpenStack (85)