ZyXEL Communications ADSL VoIP IAD with 802.11g Wireless 2602HW Series Guide de l'utilisateur télécharger pdf (Page 338)

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101

Prestige 2602HW Series User’s Guide

338 Chapter 33 Filter Configuration

Figure 192 Executing an IP Filter

33.4.2 Generic Filter Rule

This section shows you how to configure a generic filter rule. The purpose of generic rules is

to allow you to filter non-IP packets. For IP, it is generally easier to use the IP rules directly.

For generic rules, the Prestige treats a packet as a byte stream as opposed to an IP packet. You

specify the portion of the packet to check with the Offset (from 0) and the Length fields, both

in bytes. The Prestige applies the Mask (bit-wise ANDing) to the data portion before

comparing the result against the Value to determine a match. The Mask and Value fields are

specified in hexadecimal numbers. Note that it takes two hexadecimal digits to represent a

byte, so if the length is 4, the value in either field will take 8 digits, for example, FFFFFFFF.

Packet

into IP Filter

Matched

Yes

Action Matched

Action Not Matched

More?

Filter Active?

Check

IP Protocol

Drop

Drop Packet Accept Packet

Drop Forward

Check Next Rule

Forward

Not Matched

Yes

Check Src

IP Addr

Apply SrcAddrMask

to Src Addr

Matched

Check Dest

IP Addr

Apply DestAddrMask

to Dest Addr

Not Matched

Check Src &

Dest Port

Matched

Not Matched

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