1.sudo permission setting
   # Defaults specification
       Defaults:cxie timestamp_timeout=-1   #set network timeout
  # Runas alias specification
  # User privilege specification
      root    ALL=(ALL) ALL
      cxie    ALL=(ALL) ALL                    #set root permission
2.firewall setting
     "Desktop"--->System Setting --->Security Level, enter "Security Level Configuration"
3.linux boot rescue
   a. plug in linux boot CD-ROM, then enter command line,input"linux rescue text"
   b. enter this route: cd /mnt/image/systemimage
                               cd  /boot/grub/
       then cat "grub.conf" file, get boot -sector info. from file.if  boot-sector is "hd0,1"
      you can do following setting:
      input command "grub" then set ->root(hd0,1)
                                                     -->setup(hd0)
                                                     -->quit-->exit