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# 2 Discovery of network interfaces

In a similar way as [file
systems](/manual/discovery/low_level_discovery#configuring-lowlevel-discovery)
are discovered, it is possible to also discover network interfaces.

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#### Item key

The item key to use in the [discovery
rule](/manual/discovery/low_level_discovery#discovery-rule) is

    net.if.discovery

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#### Supported macros

You may use the {\#IFNAME} macro in the discovery rule
[filter](/manual/discovery/low_level_discovery#filter) and prototypes of
items, triggers and graphs.

Examples of item prototypes that you might wish to create based on
"net.if.discovery":

-   "net.if.in\[{\#IFNAME},bytes\]",
-   "net.if.out\[{\#IFNAME},bytes\]".

Note that on Windows {\#IFGUID} is also returned.

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