VSFTPD limit the number of simultaneous vsftpd connections for a single IP address

Q. How do I force VSFTPD ftp server to limit the number of simultaneous vsftpd connections from the same IP address under Debian Linux?

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A. By default VSFTPD allows unlimited connection from the same client IP address. You can easily force vsftpd ftp server to use limited number of connection. There is a special directive called max_per_ip.

Step # 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

Step # 2: Setup limitation

Set up the max_per_ip=3 (this will limit simultaneous connection to 3 number only)
max_per_ip=3

You are restricting end user to a specific host to 3 concurrent connections.

Step # 3: Restart vsftpd

# /etc/init.d/vsftpd restart

Now vsftpd should limit the number of simultaneous vsftpd connections for a single IP address. If end user try to cross this limit she will see following error message:

421 There are too many connections from IP address.
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