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For testing the loading of netmap cache from disk, the cache needs to exist. The simple solution is to start two nodes and connect them to control, with the netmap caching capability set. Then cut the connection to control, restart the nodes, and ping between them. This tests that we can start from a cache and get to running state, but also that we are able to establish a connection between the nodes. For now this is not testing how the nodes are able to talk to each other (DERP vs direct). Updates #19597 Signed-off-by: Claus Lensbøl <claus@tailscale.com>