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Hi Darragh, thanks for reply. no, the quantum router gateway are reached quickly, see this log. Tcpdump are made on the private interface of the quantum router.

09:35:59.143451 IP 212.29.130.12 > 192.168.178.2: ICMP echo request, id 15800, seq 1, length 64 09:35:59.836781 IP 212.29.130.12 > 192.168.178.2: ICMP echo request, id 15800, seq 2, length 64 09:36:00.844828 IP 212.29.130.12 > 192.168.178.2: ICMP echo request, id 15800, seq 3, length 64 09:36:01.852905 IP 212.29.130.12 > 192.168.178.2: ICMP echo request, id 15800, seq 4, length 64 09:36:02.355638 IP 192.168.178.2 > 212.29.130.12: ICMP echo reply, id 15800, seq 1, length 64 09:36:02.355710 IP 192.168.178.2 > 212.29.130.12: ICMP echo reply, id 15800, seq 2, length 64 09:36:02.355731 IP 192.168.178.2 > 212.29.130.12: ICMP echo reply, id 15800, seq 3, length 64 09:36:02.355760 IP 192.168.178.2 > 212.29.130.12: ICMP echo reply, id 15800, seq 4, length 64 09:36:02.854375 IP 212.29.130.12 > 192.168.178.2: ICMP echo request, id 15800, seq 5, length 64 09:36:02.855173 IP 192.168.178.2 > 212.29.130.12: ICMP echo reply, id 15800, seq 5, length 64 09:36:03.856016 IP 212.29.130.12 > 192.168.178.2: ICMP echo request, id 15800, seq 6, length 64 09:36:03.856978 IP 192.168.178.2 > 212.29.130.12: ICMP echo reply, id 15800, seq 6, length 64

and this is the ping output :

64 bytes from 185.21.172.18: icmp_req=1 ttl=58 time=3527 ms 64 bytes from 185.21.172.18: icmp_req=2 ttl=58 time=2520 ms 64 bytes from 185.21.172.18: icmp_req=3 ttl=58 time=1512 ms 64 bytes from 185.21.172.18: icmp_req=4 ttl=58 time=504 ms 64 bytes from 185.21.172.18: icmp_req=5 ttl=58 time=2.56 ms 64 bytes from 185.21.172.18: icmp_req=6 ttl=58 time=2.69 ms 64 bytes from 185.21.172.18: icmp_req=7 ttl=58 time=3.27 ms 64 bytes from 185.21.172.18: icmp_req=8 ttl=58 time=2.47 ms 64 bytes from 185.21.172.18: icmp_req=9 ttl=58 time=2.51 ms

The reply packet flows (on the quantum server) are created 1-2 seconds(or more) later i started to ping VM and so we see the reply ping deleted. I think that this is my problem, but i don't know how to solve

Thanks