ZyXEL Communications Prestige 128L User Manual page 82

If the filter type is IP (TCP/IP), the following abbreviations will be used:
If the filter type is GEN (generic), the following abbreviations will be
used:
If the filter type is IPX (Novell IPX), the following abbreviations will be
used:
70 Filter Configuration
m - Refers to Action Matched. F means to forward the packet, D
means to drop the packet, and N means check the next rule.
n - Refers to Action Not Matched. F means to forward the packet,
D means to drop the packet, and N means check the next rule.
Figure 9-3 Menu 21.1 - Filter Rules Summary
Pr - Protocol.
SA - Source Address.
SP - Source Port number.
DA - Destination Address.
DP - Destination Port number.
Off - Offset.
Len - Length.