Install ProFTPD:
emerge proftpd
Edit /etc/proftpd/proftpd.conf:
ServerName "ProFTPD" ServerType standalone <Directory /> AllowOverwrite on </Directory>
You can check configuration file path and content with proftpd -td9.
Include ProFTPD at system startup:
rc-update add proftpd default
Start it directly with:
/etc/init.d/proftpd start
Remove the newly created home directory:
rm /home/ftp
With this, you can make an FTP access to your Linux machine with a web browser:
ftp://user@IPaddress