5 Firewall configuration using the example of a SCALANCE SC632-2C 
 
Service Bridge – Setup and Configuration 
Entry ID: 109747975,    V1.4,    05/2019 
 
 Siemens AG 2019 All rights reserved 
Definition of MA rules 
In the following, the MAC rules are created which only allow communication that 
has the MAC address of the ES as source or destination address. This means 
multicast, broadcast and message frames between other subscribers are rejected. 
 
You can determine the MAC address of the network adapter, e.g. via the 
command prompt (CMD) using the command "ipconfig/all". 
Information about all network adapters is displayed. 
In the following, the MAC address of the network card is required to access the 
PROFINET networks. 
 
34. Go to the "Firewall" tab of the SCALANCE SC632-2C to open the properties 
(1). 
 
35. Switch to the tab "MAC rules" (2) and click on the button "Create" (3) to create 
a new MAC rule.