1: Open vsftpd.conf file
Use text editor such as vi to edit /etc/vsftpd.conf or /etc/vsftpd/vsftpd.conf file:
# vi vsftpd.conf
2: Setup limitation
Set up the max_per_ip=4 (this will limit simultaneous connection to 4 number only)
max_per_ip=4
3: Restart vsftpd
# /etc/init.d/vsftpd restart
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source:http://linuxpoison.blogspot.com/2008/01/13578175808905.html