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I am facing the same problem here. I also use the gre and tunnel approach, but I have a controller node and a network node separately, the vm can ping neither the gateway nor external ip.
even if I get into the subnet, it's impossible to ping vms:
root@netnode:/etc/quantum# ip netns exec qrouter-a6298ee9-2857-4067-81a8-f050fea7e24d bash
root@netnode:/etc/quantum# ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:7 errors:0 dropped:0 overruns:0 frame:0
TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:784 (784.0 B) TX bytes:784 (784.0 B)
qg-3aa46fc9-6a Link encap:Ethernet HWaddr fa:16:3e:db:06:1f
inet addr:192.168.3.163 Bcast:192.168.3.175 Mask:255.255.255.240
inet6 addr: fe80::f816:3eff:fedb:61f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1511 errors:0 dropped:53 overruns:0 frame:0
TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:161443 (161.4 KB) TX bytes:1152 (1.1 KB)
qr-4d2e8b60-33 Link encap:Ethernet HWaddr fa:16:3e:f2:1c:48
inet addr:10.0.20.1 Bcast:10.0.20.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fef2:1c48/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:308 (308.0 B) TX bytes:468 (468.0 B)
qr-cd43bdb6-1c Link encap:Ethernet HWaddr fa:16:3e:11:52:0b
inet addr:10.0.10.1 Bcast:10.0.10.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fe11:520b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:308 (308.0 B) TX bytes:468 (468.0 B)
root@netnode:/etc/quantum# ping 10.0.20.3 PING 10.0.20.3 (10.0.20.3) 56(84) bytes of data. From 10.0.20.1 icmp_seq=1 Destination Host Unreachable From 10.0.20.1 icmp_seq=2 Destination Host Unreachable From 10.0.20.1 icmp_seq=3 Destination Host Unreachable From 10.0.20.1 icmp_seq=4 Destination Host Unreachable From 10.0.20.1 icmp_seq=5 Destination Host Unreachable