USRobotics NETServer/16 Manuel d'utilisateur télécharger pdf (Page 120)

8-6 Packet Filters

Filter Rule Format

A packet filter consists of a set of rules which you must create.

A newly created packet filter contains no rules. The number of

rules a packet filter may have is limited only by the amount of

available flash memory in the NETServer.

When entering rules at the command line, rules must be num-

bered. Rules are processed in order, starting at rule 1. There are

three types of packet filter rules: IPX rules, IP rules, and SAP

rules. A packet filter can contain all three types. Each type of

rule is numbered separately. So, a filter can contain an IP rule 3,

an IPX rule 3 and an SAP rule 3 all at the same time.

set <rule type> <name> <rule #> <

permit

deny

> <options>

For example:

set filter sales.in 3 permit icmp

The example adds IP rule 3 to the packet filter sales.in (or over-

writes the previous IP rule 3). Rule 3 permits all ICMP packets

to pass through the interface.

Rule Type

There are three types of filter rules (IP, IPX and SAP). A filter

can contain all three types of rules. The filter rule type com-

mand options are:

filter IP rules

ipxfilter IPX rules

sapfilter SAP rules

Name

This is the name of an existing filter.

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USRobotics NETServer/16 Manuel d'utilisateur Page 120