Membatasi hak akses ke FTP server berdasarkan IP

hai semua, merdeka!!!
aku ada masalah nich. aku lagi pusing gimana cara batesin hak akses ke FTP 
server, tapi harus berdasarkan IP. karena selama ini, pembatasan hanya 
berdasarkan user. sebelumnya aku ucapkan terima kasih.

                
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