The Network Map app provides a way to map devices to specific users. Some of the benefits of using this app:
If your system does not have this app available, you can install it via the Marketplace.
You can find this feature in the menu system at the following location:
<navigation>Network|Device Management|Network Map</navigation>
Once the Network Map app is installed, it starts to scan your network for devices. As soon as a device makes a connection to ClearOS, it leaves a fingerprint in the network map scan. A summary of the number of unknown devices is shown in the web-based interface as shown in the screenshot below:
Along with the MAC address, IP and the timestamp of the last time the device was seen on the network, Vendor information is shown. In the screenshot shown, it is easier for an administrator to identify devices based on vendor information:
Whether you make a selection from the network scan list or manually add a device, you can create a network map entry for a particular MAC address. The map includes:
You can also specify optional information to help identify and sort devices:
The underlying program, arpwatch, is set up to send out an e-mail to root every time it detects a change in the network. This can be useful but it can also be a PITA. If you want to receive them you should alias “root” to a valid user in /etc/aliases. If you don't want to receive them, you need to edit /etc/sysconfig/arpwatch, change:
OPTIONS="-u arpwatch -N -e root -s 'root (Arpwatch)'"
OPTIONS="-u arpwatch -N -e -"
then restart arpwatch with:
SERVICES=$(ls /etc/systemd/system/multi-user.target.wants/arpwatch*) for SERVICE in $SERVICES; do true /bin/systemctl condrestart $(basename $SERVICE) > /dev/null 2>&1 done
Also check /var/spool/mail/root and possibly delete the file if you don't want the e-mails it contains. The file will be recreated automatically if it is needed by other programs.