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NBG-419N User’s Guide
141
C
HAPTER
18
RIP
18.1
Overview
Routing Information Protocol (RIP) is an interior or intra-domain routing protocol that uses
distance-vector routing algorithms. RIP is used on the Internet and is common in the NetWare
environment as a method for exchanging routing information between routers.
18.2
What You Can Do
Use the
RIP
screen (
Section 18.3 on page 141
)
to enable RIPv1 or RIPv2, which are LAN broadcast
protocols.
18.3
RIP Screen
Use this screen to enable RIPv1 or RIPv2, which are LAN broadcast protocols. Click
Network >
RIP
. The screen appears as shown.
Figure 100
Network > RIP
The following table describes the labels in this screen.
Table 62
Network > RIP
LABEL
DESCRIPTION
RIP
Select the
RIPv1
or
RIPv2
you want the NBG-419N to use.
Otherwise select
None
.
Apply
Click
Apply
to save your changes back to the NBG-419N.
Reset
Click
Reset
to begin configuring this screen afresh.
Page 142 / 292
Chapter 18 RIP
NBG-419N User’s Guide
142
Page 143 / 292
NBG-419N User’s Guide
143
C
HAPTER
19
Firewall
19.1
Overview
This chapter shows you how to enable and configure the firewall that protects your NBG-419N and
your LAN from unwanted or malicious traffic.
Enable the firewall to protect your LAN computers from attacks by hackers on the Internet and
control access between the LAN and WAN. By default the firewall:
•
allows traffic that originates from your LAN computers to go to all of the networks.
•
blocks traffic that originates on the other networks from going to the LAN.
The following figure illustrates the default firewall action. User
A
can initiate an IM (Instant
Messaging) session from the LAN to the WAN (1). Return traffic for this session is also allowed (2).
However other traffic initiated from the WAN is blocked (3 and 4).
Figure 101
Default Firewall Action
19.2
What You Can Do
•
Use the
General
(
Section 19.4 on page 144
) screen to enable or disable the NBG-419N’s
firewall.
•
Use the
Services
screen (
Section 19.5 on page 145
) screen enable service blocking, enter/
delete/modify the services you want to block and the date/time you want to block them.
Page 144 / 292
Chapter 19 Firewall
NBG-419N User’s Guide
144
19.3
What You Need To Know
The NBG-419N’s firewall feature physically separates the LAN and the WAN and acts as a secure
gateway for all data passing between the networks.
It is designed to protect against Denial of Service (DoS) attacks when activated (click
the
General
tab under
Firewall
and then click the
Enable
Firewall
check box). The NBG-419N's purpose is to
allow a private Local Area Network (LAN) to be securely connected to the Internet. The NBG-419N
can be used to prevent theft, destruction and modification of data, as well as log events, which may
be important to the security of your network.
The NBG-419N is installed between the LAN and a broadband modem connecting to the Internet.
This allows it to act as a secure gateway for all data passing between the Internet and the LAN.
The NBG-419N has one Ethernet WAN port and four Ethernet LAN ports, which are used to
physically separate the network into two areas.The WAN (Wide Area Network) port attaches to the
broadband (cable or DSL) modem to the Internet.
The LAN (Local Area Network) port attaches to a network of computers, which needs security from
the outside world. These computers will have access to Internet services such as e-mail, FTP and
the World Wide Web. However, "inbound access" is not allowed (by default) unless the remote host
is authorized to use a specific service.
19.4
General Firewall Screen
Use this screen to enable or disable the NBG-419N’s firewall, and set up firewall logs. Click
Security
>
Firewall
to open the
General
screen.
Figure 102
Security > Firewall > General
The following table describes the labels in this screen.
Table 63
Security > Firewall > General
LABEL
DESCRIPTION
Enable Firewall
Select this check box to activate the firewall. The NBG-419N performs access
control and protects against Denial of Service (DoS) attacks when the firewall is
activated.
Apply
Click
Apply
to save the settings.
Reset
Click
Reset
to start configuring this screen again.
Page 145 / 292
Chapter 19 Firewall
NBG-419N User’s Guide
145
19.5
Services Screen
If an outside user attempts to probe an unsupported port on your NBG-419N, an ICMP response
packet is automatically returned. This allows the outside user to know the NBG-419N exists. Use
this screen to prevent the ICMP response packet from being sent. This keeps outsiders from
discovering your NBG-419N when unsupported ports are probed.
You can also use this screen to enable service blocking, enter/delete/modify the services you want
to block and the date/time you want to block them.
Click
Security
>
Firewall
>
Services
. The screen appears as shown next.
Figure 103
Security > Firewall > Services
The following table describes the labels in this screen.
Table 64
Security > Firewall > Services
LABEL
DESCRIPTION
ICMP
Internet Control Message Protocol is a message control and error-reporting
protocol between a host server and a gateway to the Internet. ICMP uses
Internet Protocol (IP) datagrams, but the messages are processed by the TCP/IP
software and directly apparent to the application user.
Respond to Ping
on
The NBG-419N will not respond to any incoming Ping requests when
Disable
is
selected. Select
LAN
to reply to incoming LAN Ping requests.
Select
WAN
to
reply to incoming WAN Ping requests. Otherwise select
LAN & WAN
to reply to
all incoming LAN and WAN Ping requests.
Apply
Click
Apply
to save the settings.
Enable Firewall Rule

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