External DNS Server Application flow DNS flow RDB server Application server Web server Internal DNS server Full text search server KVS server Message queue server Batch server Application server ͜͜10͘Β͍ͷࢄγεςϜ
2. TCPଓͷํΛͲ͏ͬͯࣝผ͢Δͷ͔ʁ 28 Host Y Port N Process B CONNECT Host X Port M Process A LISTEN ɾଓΛཁٻ͢ΔϗετYɼଓΛड͚͚ΔϗετXʹґଘ͢Δ ɾϗετY͔ΒΈͯѼઌϙʔτ͕LISTENϙʔτMͰ͋ΕɼHost Y ͔ΒଓΛཁٻ͍ͯ͠Δ͜ͱ͕Θ͔Δ ɾLISTENϙʔτɼϗετXͷOSʹ͍߹Θͤͯऔಘ͢Δ
3. TCPଓΠϕϯτͷूͱͳʹ͔ʁ 29 ɾΤϑΣϝϥϧϙʔτͷใґଘѲʹ༨ͳͷͰू ɾΤϑΣϝϥϧϙʔτ: Χʔωϧ͔ΒׂΓͯΒΕΔϥϯμϜͳૹ৴ݩ ϙʔτ ɾಛఆͷLISTENϙʔτෳͷΤϑΣϝϥϧϙʔτ͔Βଓ͞ΕΔ ɾ͜ΕΒͷଓΛू͠ɼ1ݸͷଓͱΈͳ͢ Host Port Process Port Port Host Port Process 1ݸͷଓ ͱͯ͠ू LISTEN ΤϑΣϝϥϧ