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Assuming [..] there is a Master running on a remote server, and [..] Subscriber and the Publisher in a local network; does the packets exchanged between the Subscriber and the Publisher need to reach the remote server?

No.

Assuming [..] there is a Master running on a remote server, and [..] Subscriber and the Publisher in a local network; does the packets exchanged between the Subscriber and the Publisher need to reach the remote server?

No.

See wiki/ROS/Concepts (ROS Computation Graph Level section), and wiki/Master.