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Page 41 / 202 Scroll up to view Page 36 - 40
Vigor2800 Series User’s Guide
35
the DHCP server you are going to use so the Relay Agent can help
to forward the DHCP request to the DHCP server.
DNS Server
Configuration
DNS stands for Domain Name System. Every Internet host must
have a unique IP address, also they may have a human-friendly,
easy to remember name such as www.yahoo.com. The DNS server
converts the user-friendly name into its equivalent IP address
.
Primary IP Address -
You must specify a DNS server IP address
here because your ISP should provide you with usually more than
one DNS Server. If your ISP does not provide it, the router will
automatically apply default DNS Server IP address: 194.109.6.66
to this field.
Secondary IP Address -
You can specify secondary DNS server IP
address here because your ISP often provides you more than one
DNS Server. If your ISP does not provide it, the router will
automatically apply default secondary DNS Server IP address:
194.98.0.1 to this field.
The default DNS Server IP address can be found via Online Status:
If both the Primary IP and Secondary IP Address fields are left
empty, the router will assign its own IP address to local users as a
DNS proxy server and maintain a DNS cache.
If the IP address of a domain name is already in the DNS cache, the
router will resolve the domain name immediately. Otherwise, the
router forwards the DNS query packet to the external DNS server
by establishing a WAN (e.g. DSL/Cable) connection.
There are two common scenarios of LAN settings that stated in Chapter 4. For the
configuration examples, please refer to that chapter to get more information for your
necessity.
3.2.3 Static Route
Go to
LAN
to open setting page and choose
Static Route
.
Index
The number (1 to 10) under Index allows you to open next page to
setup static route.
Destination Address
Displays the destination address of the static route.
Status
Displays the status of the static route.
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Vigor2800 Series User’s Guide
36
Viewing Routing Table
Displays the routing table for your reference.
Add Static Routes to Private and Public Networks
Here is an example of setting Static Route in Main Router so that user A and B locating in
different subnet can talk to each other via the router. Assuming the Internet access has been
configured and the router works properly:
z
use the Main Router to surf the Internet.
z
create a private subnet 192.168.10.0 using an internal Router A (192.168.1.2)
z
create a public subnet 211.100.88.0 via an internal Router B (192.168.1.3).
z
have set Main Router 192.168.1.1 as the default gateway for the Router A 192.168.1.2.
Before setting Static Route, user A cannot talk to user B for Router A can only forward
recognized packets to its default gateway Main Router.
1.
Go to
LAN
page and click
General Setup
, select 1st Subnet as the
RIP Protocol
Control.
Then click the
OK
button.
Note: There are two reasons that we have to apply RIP Protocol Control on
1st Subnet. The first is that the LAN interface can exchange RIP packets
with the neighboring routers via the 1st subnet (192.168.1.0/24). The second
is that those hosts on the internal private subnets (ex. 192.168.10.0/24) can
access the Internet via the router, and continuously exchange of IP routing
information with different subnets.
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Vigor2800 Series User’s Guide
37
2.
Click the
LAN - Static Route
and click on the
Index Number 1.
Please add a static
route as shown below, which regulates all packets destined to 192.168.10.0 will be
forwarded to 192.168.1.2. Click
OK
.
3.
Return to
Static Route
Setup
page. Click on another
Index Number
to add another
static route as show below, which regulates all packets destined to 211.100.88.0 will be
forwarded to 192.168.1.3.
4.
Go to
Diagnostics
and choose
Routing Table
to verify current routing table.
Delete Static Route
1.
Go to
LAN
page and click
Static Route
to open the web page. Select the index number
of the one that you want to delete.
2.
Select
Empty/Clear
from the drop-down menu, and then click the
OK
button to delete
the route.
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Vigor2800 Series User’s Guide
38
Disable Static Route
1.
Click the
Index Number
that you want to disable from the
Static Route
Configuration
page.
2.
Select
Inactive/Disable
from the drop-down menu, and then click the
OK
button to
disable the route.
3.3 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.
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Vigor2800 Series User’s Guide
39
3.3.1 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 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 10 port-mapping entries for the internal hosts.
Service Name
Enter the description of the specific network service.

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