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Chapter 5 LAN Setup
Basic Home Station VDSL2 P8701T User’s Guide
111
•
Some ISPs choose to disseminate the DNS server addresses using the DNS server extensions of
IPCP (IP Control Protocol) after the connection is up. If your ISP did not give you explicit DNS
servers, chances are the DNS servers are conveyed through IPCP negotiation. The VDSL Router
supports the IPCP DNS server extensions through the DNS proxy feature.
Please note that DNS proxy works only when the ISP uses the IPCP DNS server extensions. It
does not mean you can leave the DNS servers out of the DHCP setup under all circumstances. If
your ISP gives you explicit DNS servers, make sure that you enter their IP addresses in the
DHCP Setup
screen.
5.4.4
LAN TCP/IP
The VDSL Router has built-in DHCP server capability that assigns IP addresses and DNS servers to
systems that support DHCP client capability.
IP Address and Subnet Mask
Similar to the way houses on a street share a common street name, so too do computers on a LAN
share one common network number.
Where you obtain your network number depends on your particular situation. If the ISP or your
network administrator assigns you a block of registered IP addresses, follow their instructions in
selecting the IP addresses and the subnet mask.
If the ISP did not explicitly give you an IP network number, then most likely you have a single user
account and the ISP will assign you a dynamic IP address when the connection is established. If this
is the case, it is recommended that you select a network number from 192.168.0.0 to
192.168.255.0 and you must enable the Network Address Translation (NAT) feature of the VDSL
Router. The Internet Assigned Number Authority (IANA) reserved this block of addresses
specifically for private use; please do not use any other number unless you are told otherwise. Let's
say you select 192.168.1.0 as the network number; which covers 254 individual addresses, from
192.168.1.1 to 192.168.1.254 (zero and 255 are reserved). In other words, the first three numbers
specify the network number while the last number identifies an individual computer on that
network.
Once you have decided on the network number, pick an IP address that is easy to remember, for
instance, 192.168.1.1, for your VDSL Router, but make sure that no other device on your network
is using that IP address.
The subnet mask specifies the network number portion of an IP address. Your VDSL Router will
compute the subnet mask automatically based on the IP address that you entered. You don't need
to change the subnet mask computed by the VDSL Router unless you are instructed to do
otherwise.
Private IP Addresses
Every machine on the Internet must have a unique address. If your networks are isolated from the
Internet, for example, only between your two branch offices, you can assign any IP addresses to
the hosts without problems. However, the Internet Assigned Numbers Authority (IANA) has
reserved the following three blocks of IP addresses specifically for private networks:
• 10.0.0.0
— 10.255.255.255
• 172.16.0.0
— 172.31.255.255
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Chapter 5 LAN Setup
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112
•
192.168.0.0 — 192.168.255.255
You can obtain your IP address from the IANA, from an ISP or it can be assigned from a private
network. If you belong to a small organization and your Internet access is through an ISP, the ISP
can provide you with the Internet addresses for your local networks. On the other hand, if you are
part of a much larger organization, you should consult your network administrator for the
appropriate IP addresses.
Note: Regardless of your particular situation, do not create an arbitrary IP address;
always follow the guidelines above. For more information on address assignment,
please refer to RFC 1597, “Address Allocation for Private Internets”
and RFC 1466,
“Guidelines for Management of IP Address Space”.
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Basic Home Station VDSL2 P8701T User’s Guide
113
C
HAPTER
6
Network Address Translation (NAT)
6.1
Overview
This chapter discusses how to configure NAT on the VDSL Router.
Network Address Translation (NAT, RFC 1631) is the translation of the IP address of a host in a
packet, for example, the source address of an outgoing packet, used within one network to a
different IP address known within another network.
6.1.1
What You Can Do in this Chapter
•
Use the
Virtual Servers
screen to forward incoming service requests to the server(s) on your
local network (
Section 6.3 on page 113
).
•
Use the
DMZ Host
screen to configure a default server (
Section 6.4 on page 116
).
6.2
What You Need to Know
The following terms and concepts may help as you read through this chapter.
NAT
In the simplest form, NAT changes the source IP address in a packet received from a subscriber
(the inside local address) to another (the inside global address) before forwarding the packet to the
WAN side. When the response comes back, NAT translates the destination address (the inside
global address) back to the inside local address before forwarding it to the original inside host.
Virtual Servers
A virtual server set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP, that
you can make visible to the outside world even though NAT makes your whole inside network
appear as a single computer to the outside world.
6.3
The Virtual Servers Screen
Click
Wireless network > Classic configuration > Advanced Setup > NAT
to open the
Virtual
Servers
screen. Use this screen to manage the list of virtual server rules.
Page 114 / 240
Chapter 6 Network Address Translation (NAT)
Basic Home Station VDSL2 P8701T User’s Guide
114
Note: Many residential broadband ISP accounts do not allow you to run any server
processes (such as a Web or FTP server) from your location. Your ISP may
periodically check for servers and may suspend your account if it discovers any
active services at your location. If you are unsure, refer to your ISP.
Figure 37
NAT Virtual Servers
The following table describes the labels in this screen.
6.3.1
The Virtual Servers Add Screen
This screen lets you create or edit a virtual server rule. Click
Add
in the
Virtual Servers
screen to
open the following screen.
You may enter a single port number or a range of port numbers to be forwarded, and the local IP
address of the desired server. The port number identifies a service; for example, web service is on
port 80 and FTP on port 21. In some cases, such as for unknown services or where one server can
support more than one service (for example both FTP and web service), it might be better to
specify a range of port numbers. You can allocate a server IP address that corresponds to a port or
a range of ports.
Table 31
NAT Virtual Servers
LABEL
DESCRIPTION
Add
Click this button to create a new entry.
Remove
Select entries and click the
Remove
button to delete them.
Server Name
This field displays the name of the service used by the packets for this virtual server.
External Port
Start
This is the first external port number that identifies a service.
External Port
End
This is the last external port number that identifies a service.
Protocol
This show whether the virtual server applies to TCP traffic, UDP traffic, or both.
Internal Port
Start
This is the first internal port number that identifies a service.
Internal Port End
This is the last internal port number that identifies a service.
Server IP
Address
This field displays the inside IP address of the server.
WAN Interface
This field displays the WAN interface through which the service is forwarded.
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Chapter 6 Network Address Translation (NAT)
Basic Home Station VDSL2 P8701T User’s Guide
115
Figure 38
Virtual Servers Add
The following table describes the labels in this screen.
Table 32
Virtual Servers Add
LABEL
DESCRIPTION
Use Interface
Select a WAN interface for which you want to configure a virtual server rules.
Service Name
Select a Service: use the drop-down list to select a service.
Custom Service: type a name to specify a different service.
Server IP
Address
Enter the inside IP address of the LAN device to which the virtual server forwards traffic.
External Port
Start
Enter the original destination port for the packets.
To forward only one port, enter the port number again in the
External End Port
field.
To forward a series of ports, enter the start port number here and the end port number in
the
External End Port
field.

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