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Page 106 / 275 Scroll up to view Page 101 - 105
Vigor2110 Series User’s Guide
99
4.2.5 Bind IP to MAC
This function is used to bind the IP and MAC address in LAN to have a strengthening control
in network. When this function is enabled, all the assigned IP and MAC address binding
together cannot be changed. If you modified the binding IP or MAC address, it might cause
you not access into the Internet.
Click
LAN
and click
Bind IP to MAC
to open the setup page.
Enable
Click this radio button to invoke this function.
However, IP/MAC
which is not listed in IP Bind List also can connect to Internet.
Disable
Click this radio button to disable this function. All the settings on
this page will be invalid.
Strict Bind
Click this radio button to block the connection of the IP/MAC
which is not listed in IP Bind List.
ARP Table
This table is the LAN ARP table of this router. The information for
IP and MAC will be displayed in this field. Each pair of IP and
MAC address listed in ARP table can be selected and added to IP
Bind List by clicking
Add
below
.
Add and Edit
IP Address
–
Type the IP address that will be used for the
specified MAC address.
Mac Address
–
Type the MAC address that is used to bind with
the assigned IP address.
Refresh
It is used to refresh the ARP table. When there is one new PC
added to the LAN, you can click this link to obtain the newly ARP
table information.
IP Bind List
It displays a list for the IP bind to MAC information.
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Add
It allows you to add the one you choose from the ARP table or the
IP/MAC address typed in
Add and Edit
to the table of
IP Bind
List
.
Edit
It allows you to edit and modify the selected IP address and MAC
address that you create before.
Remove
You can remove any item listed in
IP Bind List
. Simply click and
select the one, and click
Remove
. The selected item will be
removed from the
IP Bind List
.
Note:
Before you select
Strict Bind
, you have to bind one set of IP/MAC address for one PC.
If not, no one of the PCs can access into Internet. And the web configurator of the router might
not be accessed.
4.3 NAT
Usually, the router serves as an NAT (Network Address Translation) router. NAT is a
mechanism that one or more private IP addresses can be mapped into a single public one.
Public IP address is usually assigned by your ISP, for which you may get charged. Private IP
addresses are recognized only among internal hosts.
When the outgoing packets destined to some public server on the Internet reach the NAT
router, the router will change its source address into the public IP address of the router, select
the available public port, and then forward it. At the same time, the router shall list an entry in
a table to memorize this address/port-mapping relationship. When the public server response,
the incoming traffic, of course, is destined to the router’s public IP address and the router will
do the inversion based on its table. Therefore, the internal host can communicate with external
host smoothly.
The benefit of the NAT includes:
z
Save cost on applying public IP address and apply efficient usage of IP address.
NAT allows the internal IP addresses of local hosts to be translated into one public IP
address, thus you can have only one IP address on behalf of the entire internal hosts.
z
Enhance security of the internal network by obscuring the IP address.
There are
many attacks aiming victims based on the IP address. Since the attacker cannot be aware
of any private IP addresses, the NAT function can protect the internal network.
On NAT page, you will see the private IP address defined in RFC-1918. Usually we use the
192.168.1.0/24 subnet for the router. As stated before, the NAT facility can map one or
more IP addresses and/or service ports into different specified services. In other words, the
NAT function can be achieved by using port mapping methods.
Below shows the menu items for NAT.
4.3.1 Port Redirection
Port Redirection
is
usually set up for server related service inside the local network (LAN),
such as web servers, FTP servers, E-mail servers etc. Most of the case, you need a public IP
address for each server and this public IP address/domain name are recognized by all users.
Since the server is actually located inside the LAN, the network well protected by NAT of the
router, and identified by its private IP address/port, the goal of Port Redirection function is to
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Vigor2110 Series User’s Guide
101
forward all access request with public IP address from external users to the mapping private IP
address/port of the server.
The port redirection can only apply to incoming traffic.
To use this function, please go to
NAT
page and choose
Port
Redirection
web page. The
Port Redirection Table
provides 20 port-mapping entries for the internal hosts.
Press any number under Index to access into next page for configuring port redirection.
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Enable
Check this box to enable such port redirection setting.
Mode
Two options (Single and Range) are provided here for you to choose.
To set a range for the specific service, select
Range
. In Range mode,
if the public port (start port and end port) and the starting IP of
private IP had been entered, the system will calculate and display the
ending IP of private IP automatically.
Service Name
Enter the description of the specific network service.
Protocol
Select the transport layer protocol (TCP or UDP).
WAN IP
Select the WAN IP used for port redirection. There are eight WAN
IP alias that can be selected and used for port redirection. The
default setting is
All
which means all the incoming data from any
port will be redirected to specified range of IP address and port.
Public Port
Specify which port can be redirected to the specified
Private IP and
Port
of the internal host. If you choose
Range
as the port redirection
mode, you will see two boxes on this field. Simply type the required
number on the first box. The second one will be assigned
automatically later.
Private IP
Specify the private IP address of the internal host providing the
service. If you choose
Range
as the port redirection mode, you will
see two boxes on this field. Type a complete IP address in the first
box (as the starting point) and the fourth digits in the second box (as
the end point).
Private Port
Specify the private port number of the service offered by the internal
host.
Note that the router has its own built-in services (servers) such as Telnet, HTTP and FTP etc.
Since the common port numbers of these services (servers) are all the same, you may need to
reset the router in order to avoid confliction.
For example, the built-in web configurator in the router is with default port 80, which may
conflict with the web server in the local network, http://192.168.1.13:80. Therefore, you need
to
change the router’s http port to
any one other than the default port 80
to avoid conflict,
such as 8080. This can be set in the
System Maintenance >>Management Setup
. You then
will access the admin screen of by suffixing the IP address with 8080, e.g.,
http://192.168.1.1:8080 instead of port 80.
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Vigor2110 Series User’s Guide
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4.3.2 DMZ Host
As mentioned above,
Port Redirection
can redirect incoming TCP/UDP or other traffic on
particular ports to the specific private IP address/port of host in the LAN. However, other IP
protocols, for example Protocols 50 (ESP) and 51 (AH), do not travel on a fixed port. Vigor
router provides a facility
DMZ Host
that maps ALL unsolicited data on any protocol to a
single host in the LAN. Regular web surfing and other such Internet activities from other
clients will continue to work without inappropriate interruption.
DMZ Host
allows a defined
internal user to be totally exposed to the Internet, which usually helps some special
applications such as Netmeeting or Internet Games etc.

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