Thanks again for the response. I have already been trying to do some packet captures. . .but again, not an area I am strong in. I (so far) don't see any clues. . . Here are the icmp packets that I captured while trying to ping the gateway from the instance (captured from the controller host capturing on all interfaces): No. Time Source Destination Protocol Length Info 3724 2025-02-05 08:39:47.548638 192.168.100.128 10.61.157.1 ICMP 104 Echo (ping) request id=0x9e03, seq=0/0, ttl=64 (no response found!) 3725 2025-02-05 08:39:47.549273 172.24.4.175 10.61.157.1 ICMP 104 Echo (ping) request id=0x9e03, seq=0/0, ttl=63 (no response found!) 3987 2025-02-05 08:39:48.547496 192.168.100.128 10.61.157.1 ICMP 104 Echo (ping) request id=0x9e03, seq=1/256, ttl=64 (no response found!) 3988 2025-02-05 08:39:48.547528 172.24.4.175 10.61.157.1 ICMP 104 Echo (ping) request id=0x9e03, seq=1/256, ttl=63 (no response found!) 4266 2025-02-05 08:39:49.548150 192.168.100.128 10.61.157.1 ICMP 104 Echo (ping) request id=0x9e03, seq=2/512, ttl=64 (no response found!) 4267 2025-02-05 08:39:49.548182 172.24.4.175 10.61.157.1 ICMP 104 Echo (ping) request id=0x9e03, seq=2/512, ttl=63 (no response found!) 4488 2025-02-05 08:39:50.549341 192.168.100.128 10.61.157.1 ICMP 104 Echo (ping) request id=0x9e03, seq=3/768, ttl=64 (no response found!) 4489 2025-02-05 08:39:50.549373 172.24.4.175 10.61.157.1 ICMP 104 Echo (ping) request id=0x9e03, seq=3/768, ttl=63 (no response found!) 4817 2025-02-05 08:39:51.550211 192.168.100.128 10.61.157.1 ICMP 104 Echo (ping) request id=0x9e03, seq=4/1024, ttl=64 (no response found!) 4818 2025-02-05 08:39:51.550239 172.24.4.175 10.61.157.1 ICMP 104 Echo (ping) request id=0x9e03, seq=4/1024, ttl=63 (no response found!) I can see the ping on two interfaces (the one with the source of 192.168.100.128 is one of the tap interfaces, and the one with the source of 172.24.4.175 is the br-ex interface), as the ping goes from the instance through the ovs networking stack, and through the br-ex interface. . .but all I can see is the "no response found" Not sure what to do to figure out where the packets are actually going, and why the response isn't coming back. . .