第二步：配置incoming子目錄的權限
打開proftpd.conf，在和段之間添加如下設置：
Order allow,deny
Allow from 10.0.8.
Deny from all
表示在incoming這個子目錄下，從10.0.8這個網段登錄的客戶端有寫入“WRITE”權限，其它人對該目錄的寫如權限都是被禁止的。如果要對所有的用戶開放寫入權限，只要把和之間的內容換成“Allowall“。
四、FTP服務器相關命令
1、ftpshut:關閉FTP服務，並在/etc下生成文件shutmsg。要重新開放FTP服務，把/etc/shutmsg刪除。
2、ftpcout:FTP服務器在線人數信息顯示。
3、ftpwho:FTP服務器在線人員名單。
附錄：Proftpd.conf全文及解釋
# This is a basic ProFTPD configuration file (rename it to
# 'proftpd.conf' for actual use. It establishes a single server
# and a single anonymous login. It assumes that you have a user/group
# "nobody" and "ftp" for normal operation and anon.
ServerName "MY REDHAT LINUX FTP" #設定FTP服務器的名稱
ServerType standalone #設置FTP以Standalone模式運行，而不是以dameon模式
DefaultServer on #默認FTP服務器工作
# Port 21 is the standard FTP port.
Port 21 #FTP服務默認占用的端口
# Umask 022 is a good standard umask to prevent new dirs and files
# from beingsgroupsand world writable.
Umask 022 #默認
RequireValidShell off #保證匿名用戶正常登錄，不要更改
ServerIdent off #不顯示ftp服務器版本信息，以增強安全性
# To prevent DoS attacks, set the maximum number of child processes
# to 30. If you need to allow more than 30 concurrent connections
# at once, simply increase this value. Note that this ONLY works
# in standalone mode, in inetd mode you should use an inetd server
# that allows you to limit maximum number of processes per service
# (such as xinetd)
MaxInstances 30
# Set the user andsgroupsthat the server normally runs at.
User nobody #設置FTP服務以nobody運行
Group nobody #注意：原來是“Group nobody”，一定要改為“Group nobody”
# Normally, we want files to be overwriteable.
AllowOverwrite on
# A basic anonymous configuration, no upload directories.下面一段就是匿名服務的設置。
User ftp #匿名登錄使用ftp用戶
Group ftp #匿名登錄使用ftp組
# We want clients to be able to login with "anonymous" as well as "ftp"
UserAlias anonymous guest #給ftp用戶anonymous的別名，使得anonymous登錄就是ftp用戶登錄。
# Limit the maximum number of anonymous logins
MaxClients 10 #最多10個匿名用戶同時在線
# We want 'welcome.msg' displayed at login, and '.message' displayed
# in each newly chdired directory.
DisplayLogin welcome.msg #登錄FTP顯示的歡迎信息。放在FTP的根目錄下。
DisplayFirstChdir .message
# Limit WRITE everywhere in the anonymous chroot
#說明看正文。
Order allow,deny
Allow from 10.0.8.
Deny from all
