  (IP: ֥ɥ㥹 GRE over IP)
   GRE/IP ץꥱΤ˥֥ɥ㥹 
  WAN(Wide Area Network)ۤɬפꡢˤ줬
  Υͥå LAN (Local Area Network)Τ褦˸
  Ǥ⡢󥿡ͥåȾ夹٤Ƥ뤳ȤǤޤ
  Τ褦ʤȤԤФ Y ˸Ҥ 
  "IP: multicast routing" Ǥ Y Ƥޤ

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