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Comment by Bernd Bausch for I in a remote Server (I call it host machine)...

To identify interfaces where you should trace traffic, the [networking guide](https://docs.openstack.org/neutron/latest/admin/deploy.html#deploy-mechanism-drivers) tells you the underlying network...

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Comment by Bernd Bausch for I in a remote Server (I call it host machine)...

**internet connectivity from the instance**: Does DNS work? Did you enable SNAT on the router (it's the default)? Also trace traffic.

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Comment by Bernd Bausch for I in a remote Server (I call it host machine)...

**SSH connectivity to your instance**: There are too many factors to say anything. Any error message? Is sshd running? Does the OpenStack host accept ssh access to the instance? Trace NW traffic on the...

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the VM I can ping the host machine, but can not ping other public IP

I in a remote Server (I call it `host machine`) setup the OpenStack Ocata. And in the OpenStack Ocata I created a VM, the VM use the Security Group (named `allow ping & ssh`), which is created by...

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