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Please find the steps to achieve a standard network configuration with OpenStack:

1. Create a router and set a gateway to an external network
2. Create a network/subnet
3. Add a router interface to the network created in step 2.
4. Launch an instance and select the network you created in step 2.
5. Allocate a floating IP for the external network used in step 1.
6. Associate the floating IP to the instance

As a result, you should be able** to ping/ssh/... the instance from the external network.

**If this doesn't work, make sure your network interfaces are correctly set (ifconfig/route) by logging into the VM through the console in Horizon.

Please find Here are the most basic steps to achieve a standard network configuration with OpenStack:using floating IPs:

1. Create a router and set a gateway to an external network
2. Create a network/subnet
3. Add a router interface to the network created in step 2.
4. Launch an instance and select the network you created in step 2.
5. Allocate a floating IP for the external network used in step 1.
6. Associate the floating IP to the instance

As a result, you should be able** to ping/ssh/... the instance from the external network.

**If this doesn't work, make sure your network interfaces are correctly set (ifconfig/route) by logging into the VM through the console in Horizon.