Asus Router RX3141 User Manual

							RX3141 User’s Manual  Chapter 5 Router Connection Setup 
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5.2.3 PPPoE Unnumbered 
Some of the ADSL service providers may offer PPPoE unnumbered service. Choose this connection mode if 
your ISP provides such service. 
 
Figure 5.11. WAN – PPPoE Unnumbered Configuration 
Connection 
Mode drop-
down list  
						

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5.2.3.1  WAN PPPoE Unnumbered Configuration Parameters 
Table 5.3 describes the configuration parameters available for PPPoE unnumbered connection mode. 
Table 5.3. WAN PPPoE Unnumbered Configuration Parameters 
Setting Description 
Connection Mode Select PPPoE Unnumbered from the connection mode drop-down list.  
Traditionally, each network interface must have a unique IP address. 
However, an unnumbered interface does not have to have a unique IP 
address. This means that when this option is selected, the WAN and the LAN 
use the same IP address. Network resources are therefore conserved 
because fewer network IP addresses are used and routing table is smaller. 
Enable NAPT Check or uncheck this box to enable NAPT for this connection. 
Connect on Demand Check “Enable” or “Disable” radio button to enable/disable this option.  
Disconnect after Idle 
(min) Enter the inactivity timeout period at which you want to disconnect the Internet 
connection when there is no traffic. A value of 0 means no activity time out. 
Note that SNTP service may interfere with this function if there are activities 
from the service. 
IP Address Enter a static IP address here for the PPPoE unnumbered connection. This 
IP address must be provided by your service provider. 
Unnumbered network 
address Enter the network address provided by your ISP. 
Unnumbered netmask Enter the subnet mask provided by your ISP. 
User Name and 
Password Enter the username and password you use to log into your ISP. (Note: this is 
different from the information you used to log into Configuration Manager.) 
Service Name Enter the service name provided by your ISP. Service name is optional but 
may be required by some ISPs. 
Status On: PPPoE unnumbered connection is active. 
Off: No PPPoE unnumbered connection is inactive. 
Connecting: RX3141 is trying to connect to your ISP using PPPoE 
unnumbered connection mode. 
Manual 
Disconnect/Connect Click the Disconnect or Connect button to disconnect or connect to your 
service provider using the PPPoE unnumbered connection mode.   
						

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5.2.3.2  Configuring PPPoE Unnumbered for WAN 
Follow the instructions below to configure PPPoE unnumbered settings: 
1.  Open the Router Connection configuration page by double clicking the 
Router Setup Î 
Connection menu.  
2. Select 
PPPoE Unnumbered from the WAN Connection Mode drop-down list as shown in Figure 
5.11. 
3.  Enter user name and password provided by your ISP.. 
4.  (Optional) Enter the service name if required by your ISP. 
5.  Enter appropriate connection settings for “
Disconnect after Idle (min)” and “Connect on 
Demand
”. 
6. Click 
 to save the settings. 
5.2.4 Dynamic IP 
Dynamic IP is most often used by the cable modem service providers. 
 
Figure 5.12. WAN – Dynamic IP (DHCP client) Configuration 
5.2.4.1  Configuring Dynamic IP for WAN 
Follow the instructions below to configure dynamic IP settings: 
1.  Open the Router Connection configuration page by double clicking the 
Router Setup Î menu.  
2.  Select Dynamic from the Connection Mode drop-down list as shown in Figure 5.12. Note that the 
IP addresses for the primary and/or the secondary DNS servers are automatically assigned by 
the DHCP server of your ISP. 
3. Click 
 to save the settings. 
Connection 
Mode drop-
down list  
						

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5.2.5 Static IP 
   
Figure 5.13. WAN – Static IP Configuration 
5.2.5.1  WAN Static IP Configuration Parameters 
Table 5.4 describes the configuration parameters available for static IP connection mode. 
Table 5.4. WAN Static IP Configuration Parameters 
Setting Description 
Connection Mode Select Static from the connection mode drop-down list. 
IP Address WAN IP address provided by your ISP. 
Subnet Mask WAN subnet mask provided by your ISP. Typically, it is set as 255.255.255.0. 
Gateway Address Gateway IP address provided by your ISP. It must be in the same subnet as 
the WAN on the RX3141. 
Primary/Secondary 
DNS Server
 You must at least enter the IP address of the primary DNS server. Secondary 
DNS server is optional 
5.2.5.2  Configuring Static IP for WAN 
Follow the instructions below to configure static IP settings: 
1.  Open the Router Connection configuration page by double clicking the 
Router Setup Î  
Connection
 menu. 
2.  Select Static from the Connection Mode drop-down list as shown in Figure 5.13. 
3.  Enter WAN IP address in the IP Address field. This information should be provided by your ISP. 
4.  Enter Subnet Mask for the WAN. This information should be provided by your ISP. Typically, it is 
255.255.255.0. 
5.  Enter gateway address provided by your ISP in the space provided. 
6.  Enter the IP address of the primary DNS server. This information should be provided by your ISP. 
Secondary DNS server is optional. 
7. Click 
 to save the settings 
.
Connection 
Mode drop-
down list  
						

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6 DHCP Server Configuration 
6.1  DHCP (Dynamic Host Control Protocol) 
6.1.1 What is DHCP? 
DHCP is a protocol that enables network administrators to centrally manage the assignment and distribution of 
IP information to computers on a network. 
When you enable DHCP on a network, you allow a device — such as the RX3141 — to assign temporary IP 
addresses to your computers whenever they connect to your network. The assigning device is called a DHCP 
server, and the receiving device is a DHCP client.  
 Note 
If you followed the Quick Start Guide instructions, you either 
configured each LAN PC with an IP address, or you specified that 
it will receive IP information dynamically (automatically). If you 
chose to have the information assigned dynamically, then you 
configured your PCs as DHCP clients that will accept IP 
addresses assigned from a DCHP server such as the RX3141. 
 
The DHCP server draws from a defined pool of IP addresses and “leases” them for a specified amount of time 
to your computers when they request an Internet session. It monitors, collects, and redistributes the addresses 
as needed. 
On a DHCP-enabled network, the IP information is assigned dynamically rather than statically. A DHCP client 
can be assigned a different address from the pool each time it reconnects to the network. 
6.1.2  Why use DHCP? 
DHCP allows you to manage and distribute IP addresses throughout your network from the RX3141. Without 
DHCP,
 you would have to configure each computer separately with IP address and related information. DHCP 
is commonly used with large networks and those that are frequently expanded or otherwise updated. 
6.1.3  Configuring DHCP Server 
 Note 
 The RX3141 is configured as a DHCP server on the LAN side, 
with a predefined IP address pool of 192.168.1.100 through 
192.168.1.149 (subnet mask 255.255.255.0). To change this 
range of addresses, follow the procedures described in this 
section.  
 
First, you must configure your PCs to accept DHCP information assigned by a DHCP server: 
1.  Open the DHCP Server Configuration page, shown in Figure 6.1, by double clicking 
Advanced 
Î 
DHCP Server menu.  
						

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Figure 6.1. DHCP Server Configuration Page 
2.  Enter the information for the IP Address Pool (Begin/End Address), Subnet Mask, Lease Time 
and Default Gateway IP Address, fields; others, such as Primary/Secondary DNS Server IP 
Address and Primary/Secondary WINS Server IP Address are optional. However, it is 
recommended that you enter the primary DNS server IP address in the space provided. You may 
enter the LAN IP or your ISP’s DNS IP in the primary DNS Server IP Address field. Table 6.1 
describes the DHCP configuration parameters in detail. 
Table 6.1. DHCP Configuration Parameters 
Field Description 
Enable Check or uncheck this box to enable or disable DHCP server service for your 
LAN. 
IP Address Pool 
Begin/End Specify the lowest and highest addresses in the DHCP address pool. 
Lease Time The amount of time in seconds the assigned address will be used by a device 
connected on the LAN. 
Default Gateway IP 
Address
 The address of the default gateway for computers that receive IP addresses 
from this pool. The default gateway is the device that the DHCP client 
computers first contacted to communicate with the Internet. Typically, it is the 
RX3141’s LAN port IP address. 
Primary/Secondary 
DNS Server IP 
Address
 The IP address of the Domain Name System server to be used by computers 
that receive IP addresses from this pool. The DNS server translates common 
Internet names that you type into your web browser into their equivalent 
numeric IP addresses. Typically, the server(s) are located with your ISP. 
However, you may enter LAN IP address of the RX3141 as it will serve as 
DNS proxy for the LAN computers and forward the DNS request from the  
						

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Field Description 
LAN to DNS servers and relay the results back to the LAN computers. Note 
that both the primary and secondary DNS servers are optional. 
Primary/Secondary 
WINS Server IP 
Address (optional) The IP address of the WINS servers to be used by computers that receive IP 
addresses from the DHCP IP address pool. You don’t need to enter this 
information unless your network has WINS servers. 
3. Click  to save the DHCP server configurations. 
6.1.4  Viewing Current DHCP Address Assignments 
When the RX3141 functions as a DHCP server for your LAN, it keeps a record of any addresses it has leased 
to your computers. To view a table of all current IP address assignments,
 just open the DHCP Server 
Configuration page and click on the link “
Current DHCP Lease Table” located at the bottom of the 
configuration page. A page displays similar to that shown in Figure 6.2. 
The DHCP lease table lists any IP addresses leased and the corresponding MAC addresses. 
 
Figure 6.2. DHCP Lease Table 
  
						

							RX3141 User’s Manual  Chapter 7. Configuring Static Routes 
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7 Configuring Static Routes 
You can use Configuration Manager to define specific routes for your Internet and network data 
communication. This chapter describes basic routing concepts and provides instructions for creating static 
routes. Note that most users do not need to define static routes. 
7.1  Overview of IP Routes 
The essential challenge of a router is: when it receives data intended for a particular destination, which next 
device should it send that data to? When you define IP routes, you provide the rules that the RX3141 uses to 
make these decisions.  
7.1.1  Do I need to define static routes? 
Most users do not need to define static routes. On a typical small home or office network, the existing routes 
that set up the default gateways for your LAN computers and for the RX3141 provide the most appropriate 
path for all your Internet traffic. 
f  On your LAN computers, a default gateway directs all Internet traffic to the LAN port on the RX3141. 
Your LAN computers know their default gateway either because you assigned it to them when you 
modified their TCP/IP properties, or because you configured them to receive the information 
dynamically from a server whenever they access the Internet. (Each of these processes is described 
in the Quick Start Guide instructions, Part 2.) 
f  On the RX3141 itself, a default gateway is defined to direct all outbound Internet traffic to a router at 
your ISP. This default gateway is assigned automatically by your ISP whenever the device negotiates 
an Internet connection. (The process for adding a default route is described in section 7.2.2 Adding 
Static Routes.) 
You may need to define static routes if your home setup includes two or more networks or subnets, if you 
connect to two or more ISP services, or if you connect to a remote corporate LAN.  
						

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7.2 Static Route 
 
Figure 7.1.  Routing Configuration Page 
7.2.1  Static Route Configuration Parameters 
The following table defines the available configuration parameters for static routing configuration. 
Table 7.1. Static Route Configuration Parameters 
Field Description 
Destination Address Specifies the IP address of the destination computer or an entire destination 
network. It can also be specified as all zeros to indicate that this route should 
be used for all destinations for which no other route is defined (this is the 
route that creates the default gateway). Note that destination IP must be a 
network ID. The default route uses a destination IP of 0.0.0.0. Refer to 
Appendix 12 for an explanation of network ID. 
Subnet Mask Indicates which parts of the destination address refer to the network and 
which parts refer to a computer on the network. Refer to Appendix 12, for an 
explanation of network masks. The default route uses a 0.0.0.0 for subnet 
mask. 
Gateway Gateway IP address 
Interface Available option include AUTO, Eth0 (LAN), Eth1 (WAN), PPPoE:0 
(unnumbered), PPPoE:1 (1st PPPoE session), PPPoE:2 (2nd PPPoE session). 
These options are selectable from the drop-down list. If AUTO is selected, the 
router will automatically assign an interface to route the packets based on the 
gateway IP address.