如題：用21埠，可以下載檔案,port 是我本地對應的外網地址
000245)2016/3/23 15:50:21 - (not logged in) (183.131.104.19)> USER jiafei
(000245)2016/3/23 15:50:21 - (not logged in) (183.131.104.19)> 331 Password required for jiafei
(000245)2016/3/23 15:50:21 - (not logged in) (183.131.104.19)> PASS ******
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> 230 Logged on
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> TYPE I
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> 200 Type set to I
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> PORT 183,131,104,19,218,230
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> 200 Port command successful
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> SIZE /南京寫卡專案檔案/南京寫卡專案檔案/version.csv
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> 213 24395
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> RETR /南京寫卡專案檔案/南京寫卡專案檔案/version.csv
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> 150 Opening data channel for file download from server of "/南京寫卡專案檔案/南京寫卡專案檔案/version.csv"
換成其他埠如：8885， port是我本地的內網地址，這個地址肯定下載不了
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> PORT 192,168,10,96,140,220
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> 200 Port command successful
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> SIZE /南京寫卡專案檔案/南京寫卡專案檔案/version.csv
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> 213 24395
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> RETR /南京寫卡專案檔案/南京寫卡專案檔案/version.csv
(000245)2016/3/23 15:50:21 - jiafei (183.131.104.19)> 150 Opening data channel for file download from server of "/南京寫卡專案檔案/南京寫卡專案檔案/version.csv"
(000245)2016/3/23 15:50:32 - jiafei (183.131.104.19)> 425 Can't open data connection for transfer of "/南京寫卡專案檔案/南京寫卡專案檔案/version.csv"
(000244)2016/3/23 15:50:42 - jiafei (183.131.104.19)> 421 Connection timed out.
什么原因，更換埠后，怎么把我本地內網地址變為對應的外網地址？
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