All the virus-generated traffic originates from the same IP
address (generally from a infected server), a source-based
session limit ensures that the firewall can curb such
excessive amounts of traffic. Based on a threshold value,
if the number of concurrent sessions required to fill up
the session table of the particular firewall.
The default maximum for source-based session limit is 128
concurrent sessions, which can be adjusted to accordingly.
This attribute records the number of the session connection
based on the source IP that exceeds the specified limit.