Edimax Technology Edimax user guide Router - Manual (Page 53)

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System Filter Exception
System Filter Exception Rules: The rules with which any received packets is complied, the packets
will not processed by Firewall or NAT module, but to be processed directly by system protocol stack.
Figure 5-4: System Filter Exception
Firewall Exception
Enable The check box can allow you enable or disable firewall exception.
Interface You can select LAN, WAN1, WAN2 or ALL interfaces to be process by
the system protocol stack. If you enable check box.
Protocol There are six protocols (UDP/TCP/ICMP/GRE/ESP/AH) to choose to let
packets directly process by the system protocol stack.
Foreign Port Range Select foreign port number range directly process by system protocol
stack. If enable check box.
Device Port Range Select device port number range directly process by system protocol
stack. If enable check box.