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source-prefix (IDS)


Hierarchy Level


Specify the prefix length for source IPv4 address aggregation for the IDS rule. This applies session limits to an aggregation of all attacks from within a subnet of the specified length.

For example, if you configure a value of 24 for source-prefix, then attacks from and are counted as attacks from the 10.1.1/24 subnet. However, if a single host on a subnet generates a large number of network probing or flooding attacks, the flows for the entire subnet might be stopped.


prefix-value—Integer value.

  • Range: 1 through 32

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Release Information

Statement introduced before Junos OS Release 7.4.