  (IP: ե)
  ʤ Linux box 򡢥 TCP/IP ١Υͥåȥ
  ˤѥåȥե륿եȤꤷ
   Y ˤޤˡ
  ftp://metalab.unc.edu/pub/Linux/docs/HOWTO  FTP (user:
  anonymous) ͳǽ FIREWALL-HOWTO ɤɬפ
  뤫⤷ޤ

  ޤipchains ġ
  (http://netfilter.kernelnotes.org/ipchains/ WWW 
  ǽ)ɬפˤʤ뤫⤷ޤ󡣤ϡ󥿡ͥåȤΥ
  եå֥å򡢥סʤɤ
  Ū˹Ԥ褦ˤΤǤLinux Υե
  ΥɤѹƤꡢipfwadm ȸƤФŤץ
  ϤϤưޤ IPCHAINS-HOWTO ɤǤ

  ipchains 󶡤륿פΥե䡢Υ
  ͥ뤬ݡȤΤϡ"ѥåȥե륿" ȸƤФޤ
  ̤ΥפΥեǤ "proxy ١" 
  ϡǤΩäΤˤʤꡢ
  ƬǺޤΤˤʤޤϥͥåȥȥե
  ̩˸ѹ˥ϥ٥롦ץ
  ȥ˴ؤμäƤޤϥѥåȥե
  ˤϤʤΤǤˡproxy ١Υե
  ǤϡΥ饤ȤưƤץѹ
  ʤФʤʤȤ⤢ޤproxy ١Υե
  뼫ΤϥͥΥݡȤɬפȤޤ󤬡
  ϤФХѥåȥե륿Ȥ߹碌ƻȤ뤳Ȥ⤢
  ޤѥåȥե륿ϡ Y Τư
  ޤ

  եΥɤϡIP forwarding ͭˤʤä
  륫ͥǤΤưޤºݤ˥ե
  ưˤϡҤ "/proc filesystem support"  
  "Sysctl support" Ȥ Y ˤ˥֡Ȼ /proc 
  ե륷ƥबޥȤ줿塢

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

  Ȥޥɤ¹Ԥޤ

  IP ޥ졼ǥ(ޥ졼ǥ󥰤Ȥϡ롦
  ԥ塼ϳΥۥȤȤ٤꤬Ǥޤ
  ۥȤϥե롦ޥäƤ褦˸
  ȤߤǤȤȡ롦ͥåȥ
  ϳ鴰˸ʤ褦ˤʤꡢˡͥ
  ȾΥԥ塼ФŪͭ(Х)IP 
  ɥ쥹Ƥɬפʤʤޤ)IP ѥåȥ
  ƥ(ʤΥͥåȥӰȤ
  Ƥ뤫δƻ) IP Ʃץ(ͥåȥ
  Υԥ塼ˤϥ⡼ȡԥ塼ȲäƤ
  褦˸ºݤˤϡȥեåϤʤ Linux 
  եˤΥץФ˥
  쥯ȤȤ)Ȥˤϡ "IP firewalling" 
   Y ƤͤФʤޤ

  褯狼ʤ N ˤƤޤ礦

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