  (IP: ⵡǽ롼)
   Linux box ˥롼 (ͥåȥѥåȤ
  ۿꤹ륳ԥ塼) ȤƻȤȤʤ
  Y ˤޤ Y ˤȡ롼ƥ󥰽˴ؤƤܺ٤
  Ԥץ󤬤Ĥо줷ޤ

  䤤ˤɤ褦Ȥ⡢ͥľܤϱƶޤ
   N ˤȡꥹץȤˤơ롼ƥ
  ˴ؤ٤ʼ򤹤٤ƥåפǤ

  : ޥ롼Ȥưˤϡͥ IP
  forwarding ͭˤʤФʤޤ󡣤Ԥˤϡ
  Ҥ "/proc file system support"  "Sysctl support" 
  Y˥֡Ȼ /proc ե륷ƥबޥ
  줿

    echo "1" > /proc/sys/net/ipv4/ip_forward

  ȤޥɹԤ¹ԤƤ

  IP forwarding ͭˤ rp_filter ͭˤ뤳Ȥ
  Ǥ褦ˤʤޤϡ()ɥ쥹ˤĤ
  ƤΥ롼ƥ󥰥ơ֥Υȥ꤬ѥåȤ夷ͥ
  ȥ󥿡եȥޥåʤ硢äƤ
  åȤưŪ˵ݤȤΤǤ IP spoofing
  (IP ɥ쥹κ) ͽɤΤǡƥ
  ޤоΥ롼ƥ (ѥåȤξȲ
  ۤʤäϩѤ뤳) ȤäꡢʣΥ󥿡ե
  줾 IP ɥ쥹ƤƤ褦ʡ롼Ǥʤ
  ۥȤѤݤˡȤޤ
  rp_filter ̵ˤˤϡ

    echo 0 > /proc/sys/net/ipv4/conf/<device>/rp_filter
  ޤ
    echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter

  ԤäƤ

  褯狼ʤ N ˤƤƤ

  <, , (2.4.0)>

