Filter Events Using CIDR Subnets - Example 3
Filter events using CIDR subnets to match attributes listed in an uploaded cidrfile.csv
Query
cidr(field=SRC, file="cidrfile.csv", column="cidr-block")
Introduction
The cidr()
function can be used to filter
events using CIDR subnets and is used for both IPv4 and IPv6
addresses.
In this example, the cidr()
function is
used to match events for which the
SRC attributes is one of
those listed in the uploaded file
cidrfile.csv
with the subnets in the column
cidr-block.
Step-by-Step
Starting with the source repository events.
- flowchart LR; %%{init: {"flowchart": {"defaultRenderer": "elk"}} }%% repo{{Events}} 0["Expression"] result{{Result Set}} repo --> 0 0 --> result style 0 fill:#ff0000,stroke-width:4px,stroke:#000;logscale
cidr(field=SRC, file="cidrfile.csv", column="cidr-block")
Matches events for which the
SRC
field is one of those listed in the uploaded filecidrfile.csv
with the subnets in the column cidr-block. Event Result set.
Summary and Results
The query is used to search on specific subnets within the network, uptimizing query performance. The search will only be performed on the IP addresses that fall in the range of the specified subnet filter.