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[Liberty] Unable to ping instance from host machine

hello, I have set-up openstack liberty on two node architecture (1. Controller & Networking, 2. Compute ) I'm trying to access vm from host machine but its not able to ping.. We used layer 3 Linux bridge agent.

We created both private and public subnet, VM is created in private network subnet and router gateway ip is showing none and also showing only one router_interface is active..

Is it necessary to create two interfaces for router ??

I can able to ping between VM's, but its not able to ping from/to host machine. I am getting following error Error: ping -c4

From icmp_seq=1 Time to live exceeded

From icmp_seq=2 Time to live exceeded

From icmp_seq=3 Time to live exceeded

please suggest me in this regards...