Feature request: Aggregate usage by subnet

[stefand]

I have set up a guest wifi on my OpenWRT router and would like to see how much internet traffic my guests cause. From issue 19#issuecomment-339908815 I learned that nlbwmon can't directly see which firewall groups or network devices packets come from. However, it should be able to infer that information from the IP address.

What I am looking for is a tab similar to the "Traffic Distribution" tab, but instead of showing individual devices, it sums up the traffic of individual devices into groups. I could imagine the following way to automatically or manually define groups:

1: Look at IP Address + Subnet mask of interfaces defined in /etc/config/network 2: Manual configuration that allows users to specify devices in CIDR notation. That way I could separate the usage of devices in the same subnet, e.g. my personal devices, my work devices, wife, kids etc.

I think it should be trivial to manually extract this information out of exported CSV files, although I haven't tried this yet. It would be nice to easily see it on the LuCI GUI though.