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	As the comment in the code says, netstack should always respond to ICMP echo requests to a 4via6 address, even if the netstack instance isn't normally processing subnet traffic. Follow-up to #5709 Change-Id: I504d0776c5824071b2a2e0e687bc33e24f6c4746 Signed-off-by: Andrew Dunham <andrew@tailscale.com>