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•

None

– the router neither broadcasts its route table nor does it accept any RIP packets

from other routers. This effectively disables RIP.

4.

Select the

RIP Version

from the pull-down menu:

•

RIP-1

– classful routing and does not include subnet information. This is the most

commonly supported version.

•

RIP-2

– supports subnet information. Both RIP-2B and RIP-2M send the routing data in

RIP-2 format:

•

RIP-2B

– uses subnet broadcasting.

•

RIP-2M

– uses multicasting (see Note below).

5.

RIP authentication is disabled by default. To enable authentication for RIP-2B or RIP-2M,

a.

Check the

Yes

radio button.

b.

Input MD5 keys and effective and end dates for the

First Key Parameters

and

Second

Key Parameters

for MD5 based authentication between routers.

6.

Click

Apply

to save your settings.

Enabling Trend Micro Antivirus Enforcement

If you have installed the Trend Micro Client/Server Messaging Suite for SMB on your local

network, the firewall can enforce antivirus scanning. When Antivirus Enforcement is selected,

local PCs will not be allowed web access unless they have the Trend Micro OfficeScan client

installed and updated with the latest virus definitions.

To enable Trend Micro Antivirus Enforcement:

1.

Select

Security

from the main menu and

Trend Micro

from the submenu. The

Trend Micro

screen sill display.\

2.

Check the

Yes

radio box for

Do you want to enable antivirus Enforcement?.

Note:

Multicasting can reduce the load on non-router machines because they do

not listen to the RIP multicast address and will not receive the RIP packets.

However, if one router uses multicasting, then all routers on your network

must use multicasting. For RIP-2B and RIP-2M you can select the type of

authentication as NONE or MD5. If you select MD5 then you need to enter

additional parameters.

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3.

Enter the IP address of the

OfficeScan

Server

on your local network.

4.

Enter the 5-digit port number used for communications between the OfficeScan clients and the

server.

5.

Click

Apply

to enable Trend Micro.

The Host Exclusion List table lists PCs that are allowed to access the WAN without OfficeScan

client.

To allow a PC to access the web without the OfficeScan client:

Enter the IP address of the PC in the

Host

field in the

Add Host

section and click

Add.

The

address will be added to the

Host Exclusion List

table.

Note:

The OfficeScan Server must appear in the exclusion list.

Figure 3-6

Note:

Follow the instructions in the Trend Micro documentation to complete the

installation and configuration of the Trend Micro OfficeScan Server.

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Firewall Protection and Content Filtering

4-1

v1.0, September 2006

Chapter 4

Firewall Protection and Content Filtering

The ProSafe VPN Firewall 50 provides you with Web content filtering options such as Block Sites

and Keyword Blocking. Parents and network administrators can establish restricted access policies

based on time-of-day, Web addresses and Web address keywords. You can also block Internet

access by applications and services, such as chat or games. It also provides various firewall

activity reports and instant alerts via e-mail.

About Firewall Security

A firewall is a special category of router that protects one network (the “trusted” network, such as

your LAN) from another (the untrusted network, such as the Internet), while allowing

communication between the two.

A firewall incorporates the functions of a NAT (Network Address Translation) router, while

adding features for dealing with a hacker intrusion or attack, and for controlling the types of traffic

that can flow between the two networks. Unlike simple Internet sharing NAT routers, a firewall

uses a process called stateful packet inspection to protect your network from attacks and

intrusions. NAT performs a very limited stateful inspection in that it considers whether the

incoming packet is in response to an outgoing request, but true Stateful Packet Inspection goes far

beyond NAT.

Using Rules to Block or Allow Specific Kinds of Traffic

Firewall rules are used to block or allow specific traffic passing through from one side to the other.

You can configure up to 600 rules on the FVS338. Inbound rules (WAN to LAN) restrict access by

outsiders to private resources, selectively allowing only specific outside users to access specific

resources. Outbound rules (LAN to WAN) determine what outside resources local users can have

access to.

A firewall has two default rules, one for inbound traffic and one for outbound. The default rules of

the FVS338 are:

•

Inbound

: Block all access from outside except responses to requests from the LAN side.

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•

Outbound

: Allow all access from the LAN side to the outside.

Services-Based Rules

The rules to block traffic are based on the traffic’s category of service.

•

Inbound Rules (port forwarding

). Inbound traffic is normally blocked by the firewall unless

the traffic is in response to a request from the LAN side. The firewall can be configured to

allow this otherwise blocked traffic.

•

Outbound Rules (service blocking).

Outbound traffic is normally allowed unless the firewall

is configured to disallow it.

•

Customized Services

. Additional services can be added to the list of services in the factory

default list. These added services can then have rules defined for them to either allow or block

that traffic.

•

Quality of Service (QoS)

. Each service at its own native priority that impacts its quality of

performance and tolerance for jitter or delays. You can change this QoS priority if desired to

change the traffic mix through the system.

Outbound Rules (Service Blocking)

The FVS338 allows you to block the use of certain Internet services by PCs on your network. This

is called service blocking or port filtering.

Note:

See

“Enabling Source MAC Filtering” on page 4-23

for yet another way to block

outbound traffic from selected PCs that would otherwise be allowed by the

firewall.