# Internet and LAN

DU Meter is able to discriminate network traffic by IP address. This feature is very useful if only *some* of
your traffic should be accounted for - for example, if you are only interested in seeing the traffic to and
from the Internet, and not local traffic between computers on your local network.

By default, DU Meter alerts and accounting are acting on Internet traffic only. DU Meter built-in rules can
discriminate between local network and all other network traffic in most cases. However, if your business
network has complex topology with multiple subnetworks, you might need to choose **Traffic chosen by address**
and list its addresses.

You should type in IP addresses and network masks in standard notation, for example:

```
10.8.8.0/255.255.255.0
10.8.8.0/24
```

IPv6 is also supported:

```
fda2:60a:9c9d::fe
```