Figure 17: Configure Dynamic Defense - Grandstream Networks UCM6510 User Manual

Blacklist Update
Interval
Connection
Threshold
Dynamic Defense
Whitelist
The following figure shows a configuration example like this:

If a host at IP address 192.168.40.7 initiates more than 20 TCP connections to the UCM6510 within 1
minute, it will be added into UCM6510 blacklist.

This host 192.168.40.7 will be blocked by the UCM6510 for 300 seconds.

Since IP address 192.168.40.5 is in whitelist, if the host at IP address 192.168.40.5 initiates more
than 20 TCP connections to the UCM6510 within 1 minute, it will not be added into UCM6510
blacklist. It can still establish TCP connection with the UCM6510.
Firmware Version 1.0.0.25
Configure the blacklist update time interval (in seconds). The default setting is
120. This defines how long the IP will be blocked once added into the
UCM6510 blacklist. For example, if it's set to 300 seconds, the blocked IP
address will only be able to establish TCP connection with the UCM6510 again
after 300 seconds.
Configure the connection threshold. Once the number of connections from the
same host reaches the threshold during "Periodical Time Interval", it will be
added into the blacklist. The default setting is 100.
Configure the dynamic defense whitelist. This is a list of IPs that will not be
blocked by the UCM6510.
For example,
192.168.1.3
192.168.1.4

Figure 17: Configure Dynamic Defense

UCM6510 IP PBX User Manual Page 45 of 233