i'm following this guide https://github.com/mseknibilel/OpenStack-Grizzly-Install-Guide
if i launch an instance from horizon, i can using ip netns exec qrouter-xxx ping xxx to ping that instance and ssh to it, and access external network, everything seems fine, at least from my view. **However, i cannot ping it if i launch the instance via nova boot command** is there anybody has met such problem? please help me
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