ZyXEL Communications 1001H manual Executing an IP Filter

P100IH ISDN Router

Packet
into IP Filter
Filter Active?	N o
Yes
Apply SrcAddrMask
to Src Addr
Check Src	Not Matched
IP Addr
Matched
Apply DestAddrMask
to Dest Addr
Check Dest	Not Matched
IP Addr
Matched
Check	Not Matched
IP Protocol
Matched
Check Src &	Not Matched
Dest Port
Matched
More?	Yes
N o		Action Not Matched
Action Matched	Check Next Rule	Check Next Rule
		Drop	Forward
Drop	Forward

Drop Packet Check Next Rule Accept Packet

Figure 9-8 Executing an IP Filter

9-12 Filter Configuration