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Instance to Instance access


I am running nova-network on the Havana release here. I am having issues getting instances network access to each other. External servers to the Instances and back work fine. But I have a situation where some instances need to access each other. I can not ssh or ping my instances internal or floating IP's from other instances.

I assume this getting blocked with the firewall/iptables that Openstack is controlling as I don't get any output from tcpdump on any interfaces on the compute nodes. I also assume that this maybe a routing issue that the instance cannot see the floating IP's network. Adding the route on the instance doesn't help either.

Is there anything in nova-network that I would need to set in the nova.conf file or add to a network-create command? I tried disabling the firewall with firewall_driver=nova.virt.firewall.NoopFirewallDriver to debug and that didn't help.

Any help is appreciated.