The PXE has a firewall that you can configure to prevent specific IP addresses and ranges of IP addresses from accessing the PXE device or to prevent them from receiving any data from the PXE.
The PXE allows you to configure the firewall rules for inbound and outbound traffic respectively. Inbound rules control the data sent to the PXE, and outbound rules control the data sent from the PXE.
By default the firewall is disabled.
Changes made to firewall rules take effect immediately. Any unauthorized IP activities cease instantly.
Note: The purpose of disabling the firewall by default is to prevent users from accidentally locking themselves out of the device.