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can not ping internet when launch instance cirros on mitaka

I'm new to openstack, I follow eveything in this manual: http://docs.openstack.org/mitaka/install-guide-rdo/keystone.html and I install on 2 node (controller - compute), choose option 2 (Self-service networks) . After install I can create public network, private network, router - launch instance . I had edited rule for security group, but I can not ping from cirros instance to internet . This is error when I ping router gateway from controller node:

[root@controller ~]# ping 192.168.77.42
PING 192.168.77.42 (192.168.77.42) 56(84) bytes of data.
From 192.168.77.21 icmp_seq=1 Destination Host Unreachable
From 192.168.77.21 icmp_seq=2 Destination Host Unreachable
From 192.168.77.21 icmp_seq=3 Destination Host Unreachable
From 192.168.77.21 icmp_seq=4 Destination Host Unreachable

please tell me what i missing when install mitaka. I think problem bettwen router and public gateway. thanks you.

can not ping internet when launch instance cirros on mitaka

I'm new to openstack, I follow eveything in this manual: http://docs.openstack.org/mitaka/install-guide-rdo/keystone.html and I install on 2 node (controller - compute), choose option 2 (Self-service networks) . After install I can create public network, private network, router - launch instance . I had edited rule for security group, but I can not ping from cirros instance to internet . This is error when I ping router gateway from controller node:

[root@controller ~]# ping 192.168.77.42
PING 192.168.77.42 (192.168.77.42) 56(84) bytes of data.
From 192.168.77.21 icmp_seq=1 Destination Host Unreachable
From 192.168.77.21 icmp_seq=2 Destination Host Unreachable
From 192.168.77.21 icmp_seq=3 Destination Host Unreachable
From 192.168.77.21 icmp_seq=4 Destination Host Unreachable

please tell me what i missing when install mitaka. I think problem bettwen router and public gateway. thanks you.