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Page 116 / 240 Scroll up to view Page 111 - 115
Chapter 6 Network Address Translation (NAT)
Basic Home Station VDSL2 P8701T User’s Guide
116
6.4
The DMZ Host Screen
Click
Wireless network > Classic configuration > Advanced Setup > NAT > DMZ Host
to
open the
DMZ Host
screen. Use this screen to specify the IP address of a default server to receive
packets from ports not specified in the
Virtual Servers
screen.
Figure 39
DMZ Host
The following table describes the fields in this screen.
External Port
End
Enter the last port of the original destination port range.
To forward only one port, enter the port number in the
External Start
Port
field above
and then enter it again in this field.
To forward a series of ports, enter the last port number in a series that begins with the port
number in the
External Start Port
field above.
Protocol
Select the protocol supported by this virtual server. Choices are
TCP
,
UDP
, or
TCP/UDP
.
Internal Port
Start
Enter the port number here to which you want the VDSL Router to translate the incoming
port. For a range of ports, enter the first number of the range to which you want the
incoming ports translated.
Internal Port End
Enter the last port of the translated port range.
Back
Click
Back
to return to the previous screen.
Apply
Click
Apply
to save your changes back to the VDSL Router.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 32
Virtual Servers Add (continued)
LABEL
DESCRIPTION
Table 33
DMZ Host
LABEL
DESCRIPTION
DMZ Host IP
Address
Enter the IP address of the default server which receives packets from ports that are not
specified in the
Virtual Servers
screen.
Note: If you do not assign a default server, the VDSL Router discards all packets received
for ports not specified in the virtual server configuration.
Save/Apply
Click this to save your changes back to the VDSL Router.
Page 117 / 240
Chapter 6 Network Address Translation (NAT)
Basic Home Station VDSL2 P8701T User’s Guide
117
6.5
Technical Reference
The following section contains additional technical information about the VDSL Router features
described in this chapter.
Virtual Server: Services and Port Numbers
The most often used port numbers are shown in the following table. Please refer to RFC 1700 for
further information about port numbers. Please also refer to the Supporting CD for more examples
and details on port forwarding and NAT.
Virtual Server Example
Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (
A
in the example),
port 80 to another (
B
in the example) and assign a default server IP address of 192.168.1.35 to a
third (
C
in the example). You assign the LAN IP addresses and the ISP assigns the WAN IP address.
The NAT network appears as a single host on the Internet.
Figure 40
Multiple Servers Behind NAT Example
Table 34
Services and Port Numbers
SERVICES
PORT NUMBER
ECHO
7
FTP (File Transfer Protocol)
21
SMTP (Simple Mail Transfer Protocol)
25
DNS (Domain Name System)
53
Finger
79
HTTP (Hyper Text Transfer protocol or WWW, Web)
80
POP3 (Post Office Protocol)
110
NNTP (Network News Transport Protocol)
119
SNMP (Simple Network Management Protocol)
161
SNMP trap
162
PPTP (Point-to-Point Tunneling Protocol)
1723
D=192.168.1.36
192.168.1.1
IP address assigned by ISP
A=192.168.1.33
B=192.168.1.34
C=192.168.1.35
Page 118 / 240
Chapter 6 Network Address Translation (NAT)
Basic Home Station VDSL2 P8701T User’s Guide
118
Page 119 / 240
Basic Home Station VDSL2 P8701T User’s Guide
119
C
HAPTER
7
Firewall
7.1
Overview
This chapter shows you how to enable and configure the VDSL Router firewall settings.
The VDSL Router firewall is a packet filtering firewall and restricts access based on the source/
destination computer network address of a packet and the type of application.
7.1.1
What You Can Do in this Chapter
•
Use the
General
screen (
Section 7.2 on page 119
) to enable firewall on the VDSL Router, and
set the default action that the firewall takes on packets that do not match any of the firewall
rules.
•
Use the
Rules
screen (
Section 7.3 on page 121
) to view the configured firewall rules and add,
edit or remove a firewall rule.
7.2
The Firewall General Screen
Click
Wireless network > Classic configuration > Advanced Setup > Firewall
to display the
following screen. Activate the firewall by selecting the
Active Firewall
check box .
Figure 41
Firewall General
Page 120 / 240
Chapter 7 Firewall
Basic Home Station VDSL2 P8701T User’s Guide
120
The following table describes the labels in this screen.
7.2.1
Default Policy Configuration
In the
Firewall General
screen, click
Add
or click an entry’s
Edit
icon to configure a firewall policy.
Figure 42
Firewall General: Add
The following table describes the labels in this screen.
Table 35
Firewall General
LABEL
DESCRIPTION
Active Firewall
Select this check box to activate the firewall. The VDSL Router performs access control and
protects against Denial of Service (DoS) attacks when the firewall is activated.
No.
This displays the index number of the default firewall policy.
Active
This field displays whether a policy is turned on or not. Select the check box to enable the
policy. Clear the check box to disable the policy.
Name
This displays the name of the policy.
Interface
This displays the LAN or WAN interface(s) to which this policy is applied.
Direction
This displays the direction of travel of packets (
In
and
Out
).
Firewall rules are grouped based on the direction of travel of packets to which they apply.
Default Action
This displays the default action that the firewall is to take on packets that are traveling in the
selected direction and do not match any of the firewall rules.
Drop
: the VDSL Router silently discards the packets without sending a TCP reset packet or an
ICMP destination-unreachable message to the sender.
Permit
: the VDSL Router allows the passage of the packets.
Remove
Select entries and click the
Remove
button to delete them.
Edit
Click the
Edit
button to go to the screen where you can edit the rule.
Add
Click
Add
to create a new policy.
Apply
Click
Apply
to save your changes back to the VDSL Router.
Table 36
Firewall General: Add
LABEL
DESCRIPTION
Active
Select this check box to enable the rule.
Name
Enter a descriptive name using printable English keyboard characters.

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