Cyclades AlterPath OnBoard Guía de usuario descargar pdf (Pagina 114)

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Packet Filtering on the OnSite

AlterPath OnSite Administrator’s and User’s Guide

Rules

Each chain can have one or more rules that define the following:

• The packet characteristics being filtered

The packet is checked for characteristics defined in the rule, for example,

a specific IP header, input and output interfaces, TCP flags and protocol.

• What to do when the packet characteristics match the rule

When a packet is filtered, its characteristics are compared against the

rules one-by-one. All defined characteristics must match.

Administrators can do the following to specify packet filtering:

• Add a new chain and specify rules for that chain

• Add new rules for existing chains

• Edit or delete built-in chains and rules

Add Rule and Edit Rule Options

When you add or edit a rule you can define any of the options described in the

following table.

Table 1-31: Filter Options for Packet Filtering Rules

Filter Options Description

Source IP and Mask

Destination IP and Mask

If you specify a source IP, incoming packets are filtered for

the specified IP address. If you specify a destination IP,

outgoing packets are filtered for the specified IP address.

If you fill in a source or destination mask, incoming or

outgoing packets are filtered for IP addresses from the

subnetwork in the specified netmask.

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