ZyXEL Communications P-660R-T1 Support Notes page 62

Filter Types and SUA
Conceptually, there are two categories of filter rules:
Generic filter rules belong to the device category
LAN and WAN. The IP and IPX filter rules belong to
on the IP and IPX packets.
In order to allow users to specify the local network
filter rules with SUA connections, the TCP/IP filter function has to be executed before
SUA for WAN outgoing pac
But at the same time, the Generic filter rules m
P-660 is receiving and sending the packets; i.e. the ISDN interface. So, the execution
sequence has to be chan
sequence of th e logic flow for the packet from LAN to WAN is:
•
LAN device and protocol input filter
•
WAN protocol call and
•
If SUA is enabled, SU
203.205.115.6 and po
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kets and after the SUA for WAN incoming IP packets.
ged. The logic flow of the filter is shown in Figure 1 and the
output filter sets.
A converts the source IP address from 192.168.1.33 to
rt number from 1023 to 4034.
P-660 series Support Notes
device and protocol. The
; they act on the raw data from/to
the protocol category; they act
IP address and port number in the
ust be applied at the point when the
sets.
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