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when we use the ping6 command without configuring the network interface, it should give correct prompt to users. Cc: Hegde Nagaraj P <nagaraj-p.hegde@hpe.com> Cc: Fu Siyuan <siyuan.fu@intel.com> Cc: Wu Jiaxin <jiaxin.wu@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Zhang Lubo <lubo.zhang@intel.com> Reviewed-by: Sriram Subramanian <sriram-s@hpe.com> Reviewed-by: Hegde, Nagaraj P <nagaraj-p.hegde@hpe.com> Reviewed-By: Wu Jiaxin <jiaxin.wu@intel.com>