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bdc45b9066
We would replace the existing real implementation of nettype.PacketConn with a blockForeverConn, but that violates the contract of atomic.Value (where the type cannot change). Fix by switching to a pointer value (atomic.Pointer[nettype.PacketConn]). A longstanding issue, but became more prevalent when we started binding connections to interfaces on macOS and iOS (#6566), which could lead to the bind call failing if the interface was no longer available. Fixes #6641 Signed-off-by: Mihai Parparita <mihai@tailscale.com>