OT: Good (iptables) tracing examples?

[Philip A. Prindeville]

Are there any good examples of using the TRACE target in iptables to 
follow a packet through the system?

I googled some of the examples, but they all seem fairly simple (and not 
very useful).

Also, if you see an incoming packet from a new connection that ends up 
creating state, is there any way to also trace any packets that might be 
generated in response (such as a SYN-ACK or an RESET or a 
Port-Unreachable, etc.) as part of the same flow?

Thanks,

-Philip

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