Netgear RP114 User Manual download pdf (Page 113)

Configuring Filters 10-1

Chapter 10

Configuring Filters

This chapter provides information about configuring and using filters for your Model RP114 Web

Safe Router.

Filters are used to block certain packets, reduce traffic, and prevent security breaches. The router

uses packet filters to determine whether to allow or deny passage of each data packet, based on

information found in the packet. A filter is defined by rules declaring what information is to be

checked and what action is to be taken (forward or discard) when a match is found. Two types of

packet filters are supported by the router: IP protocol filters and generic or “device” filters. An IP

protocol filter screens the packet based on IP address and port information contained in the packet.

A generic filter looks for a specified pattern of bits at a specified location in the packet.

In the configuration of IP filters, it is necessary to specify ports and protocols by their assigned

numbers instead of names. A comprehensive list of protocol and port numbers for common IP

traffic can be found in IETF RFC1700, “Assigned Numbers.” Many common port numbers are

also listed on any Windows PC in a file called \windows\services.

The Model RP114 router allow you to customize filter sets according to your needs. The following

sections describe how to configure the filter sets for your router.

Router Filter Structure

You can configure up to 12 filter sets, each with up to six rules. For IP packets, these rules involve

comparing the protocol type of a data packet (for example, TCP, UDP), source or destination

address, or port number. Also, a generic filter may be defined to merely test for a byte or pattern of

bytes in a particular location in the packet. When a rule is met (or not met), a user-specified action

is taken. This action may be to forward the packet, drop the packet, or go to the next rule.

1 2 ... 108 109 110 111 112 113 114 115 116 117 118 ... 154 155

No comments

Netgear RP114 User Manual Page 113