Grandstream Networks GWN70 Series User Manual page 56

Figure 72: Traffic Rules – Outbound Rules
The following example will deny every outgoing ICMP request from GWN70xx to the default (VLAN), this means that
whenever the GWN70xx receives an ICMP "echo-request" from another network group or from a WAN port sent to LAN1 will
be rejected.
Below screenshot shows a configuration example:
Figure 74: Output Rules Sample
Forward Rules
GWN70xx offers the possibility to allow traffic between different groups and interfaces.