ZyXEL Communications HS100/HS100W manual Execute

HomeSafe User’s Guide

apply up to four filter sets to a particular port to block multiple types of packets. With each filter set having up to six rules, you can have a maximum of 24 rules active for a single port.

Sets of factory default filter rules have been configured in menu 21 to prevent NetBIOS traffic from triggering calls and to prevent incoming telnet sessions. A summary of their filter rules is shown in the figures that follow.

The following figure illustrates the logic flow when executing a filter rule. See also Figure 27-7for the logic flow when executing an IP filter.

Start

Filter Set

Packet into filter

Fetch First Filter Set

Fetch Next				Fetch First
Filter Set				Filter Rule
		Fetch Next
		Filter Rule
Yes
		Yes
Next Filter Set	No	Next filter	No	Active?
		Rule
Available?
		Available?
				Yes
				Execute
No				Filter Rule
		Check
		Next
		Rule
				Forward
			Drop
Drop Packet				Accept Packet

Figure 27-2 Filter Rule Process

You can apply up to four filter sets to a particular port to block multiple types of packets. With each filter set having up to six rules, you can have a maximum of 24 rules active for a single port.

27-2 Filter Configuration