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The controlhttp dialer with a ControlDialPlan IPv6 entry was hitting a case where the dnscache Resolver was returning an netip.Addr zero value, where it should've been returning the IPv6 address. We then tried to dial "invalid IP:80", which would immediately fail, at least locally. Mostly this was causing spammy logs when debugging other stuff. Updates tailscale/corp#32534 Change-Id: If8b9a20f10c1a6aa8a662c324151d987fe9bd2f8 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>