Figure 8-7 Executing An Ip Filter - ZyXEL Communications Prestige 642 User Manual

Prestige 642 ADSL Internet Access Router
Packet
into IP Filter
Filter Active?
Y e s
A p p l y S r c A d d r M a s k
to Src Addr
Check Src
IP Addr
M a t c h e d
A p p l y D e s t A d d r M a s k
to Dest Addr
Check Dest
IP Addr
M a t c h e d
C h e c k
IP Protocol
M a t c h e d
Check Src &
Dest Port
M a t c h e d
M o r e ?
N o
Action Matched
D r o p
Drop Packet
8-10
N o
N o t M a t c h e d
N o t M a t c h e d
N o t M a t c h e d
N o t M a t c h e d
Y e s
Check Next Rule
Check Next Rule
F o r w a r d
Check Next Rule
Figure 8-7 Executing an IP Filter
Action Not Matched
D r o p F o r w a r d
Accept Packet
Filter Configuration