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Check whether the instance is able to access its own gateway(private network where the instance is launched).

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Check the private gateway ip is able to reach router gateway of external network(your floating ip network pool).

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Use tcp dump to trace the path of your instance traffic.

ip netns exec qdhcp-b58b2f5f-3ca6-41eb-9614-62fdc8e43e8c tcpdump -i tap748660b6-08

ip netns exec qrouter-6675c26b-aecf-4c0f-a5e8-78d30eab6ef9 tcpdump -i qg-3c22f0c9-03

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Check the data flow between the bridges.

In my case I launched an instance under subnet local-subnet 10.0.0.0/24. Its local network gateway ip is 10.0.0.1, dhcp server ip is 10.0.0.2

Floating ip subnet 192.168.0.0/24. External router gateway is 192.168.0.240

Check the datapath between private network gateway and external router gateway from your node. (10.0.0.1 to 192.168.0.240 in my case)

Best Regards,

Radhakrishnan R