Figure 7-10 Executing An Ip Filter - ZyXEL Communications ZyXEL ZYWALL10 User Manual

ZyWALL 10 Internet Security Gateway
The following figure illustrates the logic flow of an IP filter.
into IP Filter
Filter Active?
Apply SrcAddrMask
to Src Addr
Check Src
IP Addr
Matched
Apply DestAddrMask
to Dest Addr
Check Dest
IP Addr
Matched
IP Protocol
Matched
Check Src &
Dest Port
Matched
Action Matched
Drop
Drop Packet
7-10
Packet
No
Yes
Not Matched
Not Matched
Check
Not Matched
Not Matched
More? Yes
No
Check Next Rule
Forward

Figure 7-10 Executing an IP Filter

Check Next Rule
Check Next Rule
Action Not Matched
Drop Forward
Accept Packet
Filters