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Some RST (Reset) packets shows container IP as Source instead of Host IP (Sometimes NATing does not seems to work)

We have a 2 node setup where RabbitMQ container present on each node communicates with each other. When we have captured outgoing traffic on a source host using tcpdump, noticed for some RST packet the source IP is coming as container IP instead of Host IP. Seems like NATing is not working sometimes which is supposed to masquerade the container IP for outgoing traffic.

I have attached tcpdump screenshot where the last packet shows the issue.