常用服务的名称和端口号

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                  端口名称                                   端口号/协议                               别名

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                     ftp                                             21/tcp

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                     Telnet                                       23/tcp                                

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                     smtp                                          25/tcp                                     mail

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                    nicename                                   43/tcp                                      whois

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                    domain                                       53/tcp                                      nameserver

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                    domain                                       53/udp                                     nameserver

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                    finger                                          79/tcp                       

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                    http                                             80/tcp                                     www          www-http

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                    pop3                                           110/tcp                                   pop-3

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                    auth                                            113/tcp                                    authentication  tap   ident

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                    nntp                                             119/tcp                                   readnews   untp

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                     ntp                                              123/tcp                       

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                     https                                           443/tcp

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参考文章：《Linux防火墙第3版》

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