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Page 71 / 357 Scroll up to view Page 66 - 70
Vigor2830 Series User’s Guide
59
RIP Protocol Control
Disable
deactivates the RIP protocol. It will lead to a stoppage
of the exchange of routing information between routers.
(Default)
1st Subnet -
Select the router to change the RIP information of
the 1st subnet with neighboring routers.
2nd Subnet -
Select the router to change the RIP information of
the 2nd subnet with neighboring routers.
DHCP Server
Configuration
DHCP stands for Dynamic Host Configuration Protocol. The
router by factory default acts a DHCP server for your network so
it automatically dispatch related IP settings to any local user
configured as a DHCP client. It is highly recommended that you
leave the router enabled as a DHCP server if you do not have a
DHCP server for your network.
If you want to use another DHCP server in the network other
than the Vigor Router’s, you can let Relay Agent help you to
redirect the DHCP request to the specified location.
Enable Server -
Let the router assign IP address to every host in
the LAN.
Disable Server –
Let you manually assign IP address to every
host in the LAN.
Relay Agent –
Specify which subnet that DHCP server is located
the relay agent should redirect the DHCP request to.
Start IP Address -
Enter a value of the IP address pool for the
DHCP server to start with when issuing IP addresses. If the 1st
IP address of your router is 192.168.1.1, the starting IP address
must be 192.168.1.2 or greater, but smaller than 192.168.1.254.
IP Pool Counts -
Enter the maximum number of PCs that you
want the DHCP server to assign IP addresses to. The default is
50 and the maximum is 253.
Gateway IP Address -
Enter a value of the gateway IP address
for the DHCP server. The value is usually as same as the 1st IP
address of the router, which means the router is the default
gateway.
DHCP Server IP Address for Relay Agent -
Set the IP address
of 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
.
Force DNS manual setting -
Force Vigor router to use DNS
servers in this page instead of DNS servers given by the Internet
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Access server (PPPoE, PPTP, L2TP or DHCP server).
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.
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.
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Vigor2830 Series User’s Guide
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Below shows the menu items for NAT.
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 20 port-mapping entries for the internal hosts.
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Vigor2830 Series User’s Guide
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Press any number under Index to access into next page for configuring port redirection.
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
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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.

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