Using XDP in docker swarm to track outgoing traffic

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Hi everyone,
I am trying to use XDP to track outgoing traffic from docker containers deployed using docker swarm and running in a network using the driver overlay. I am using a simple xdp program based on [1], and I run this program on the network namespace of the container using nsenter and attach it to its eth0. However, I am only able to detect the incoming packets and not the outgoing ones. When running tcpdump on the container network namespace I can see both incoming and outgoing packets. So I am a bit confused as to why XDP would not detect the outgoing ones. Does anyone know why the reason for this or a general idea as to why this might happen?


Best Regards,
Sebastião Amaro

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