リモートサーãƒã«æŽ¥ç¶šã§ããªã„å ´åˆã® telnet ã«ã‚ˆã‚‹åŽŸå› 切り分ã‘方法 - kazuhoã®ãƒ¡ãƒ¢ç½®ãå ´1) telnet host port ã—㦠Escape character is ... ã¨å‡ºãŸå¾Œã€ã™ã (ã‚ã‚‹ã„ã¯å°‘ã—ã—ã¦) 接続ãŒåˆ‡ã‚Œã‚‹ → 接続後 fork() ç‰ã§è½ã¡ã¦ã„ã‚‹ → サーãƒã®ãƒ¡ãƒ¢ãƒªä¸è¶³ã‚„プãƒã‚»ã‚¹ã®ç„¡é™å¢—殖を疑ㆠ2) telnet host port ã—㦠Escape character is ... ã¨å‡ºã‚‹ãŒã€ãã®å¾Œä½•ã‚‚èµ·ã“らãªã„ → SYN_ACK ãŒè¿”ã£ã¦ãã¦ã„ã‚‹ → カーãƒãƒ«ã¯ç”Ÿãã¦ã„る。ユーザーランドã®è² è·ãŒæ¥µã‚ã¦é«˜ã„å¯èƒ½æ€§ 3) telnet host port ã—ã¦ã€ã™ã connection refused ã¨å‡ºã‚‹ → RST ãŒè¿”ã£ã¦ãã¦ã„ã‚‹ → port ãŒé–‰ã˜ã¦ã„ã‚‹ (サーãƒãƒ—ãƒã‚»ã‚¹ãŒè½ã¡ãŸ?) ã‹ã€ã¾ãŸã¯ accept(2) ã—ã¦ã„ãªã„ 4) telnet host port ã—ã¦ã€ã—ã°ã‚‰ããŸã£ã¦ã‹ã‚‰ connectin refused
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