Netgear Wnr2020v1 5pt N300 Wireless Router User Manual

							Specify Your Internet Settings 
21  N150 and N300 Wireless Routers
13. In the Domain Name Server (DNS) Address section, select one of the following radio 
buttons:
•Get Automatically from ISP. Your ISP uses DHCP to assign your DNS servers. Your 
ISP automatically assigns this address. 
•Use These DNS Servers. If you know that your ISP requires specific servers, select 
this option. Enter the IP address of your ISP’s primary DNS server. If a secondary 
DNS server address is available, enter it also. 
14. In the Router MAC Address section of the screen, select one of the following radio buttons:
•Use Default Address. Use the default MAC address.
•Use Computer MAC Address. The router captures and uses the MAC address of the 
computer that you are now using. You must use the one computer that the ISP allows.
•Use This MAC Address. Enter the MAC address that you want to use.
15. Click the Apply button.
Your settings are saved.
16. Click the Test button to test your Internet connection. 
If the NETGEAR website does not display within one minute, see Chapter 6, 
Troubleshooting.
Change the MTU Size
The maximum transmission unit (MTU) is the largest data packet a network device transmits. 
When one network device communicates across the Internet with another, the data packets 
travel through many devices along the way. If a device in the data path has a lower MTU 
setting than the other devices, the data packets must be split or “fragmented” to 
accommodate the device with the smallest MTU. 
The best MTU setting for NETGEAR equipment is often the default value. In some situations, 
changing the value fixes one problem but causes another. Leave the MTU unchanged unless 
one of these situations occurs:
•You experience problems connecting to your ISP or other Internet service, and the 
technical support of either the ISP or NETGEAR recommends changing the MTU setting. 
These web-based applications might require an MTU change:
-A secure website that does not open, or displays only part of a web page
-Yahoo email
-MSN portal
-America Online’s DSL service
•You use VPN and have severe performance problems.
•You used a program to optimize MTU for performance reasons, and now you have 
connectivity or performance problems. 
						

							Specify Your Internet Settings 22
N150 and N300 Wireless Routers 
Note:
An incorrect MTU setting can cause Internet communication 
problems. For example, you might not be able to access certain 
websites, frames within websites, secure login pages, or FTP or POP 
servers.
To change the MTU size:
1.  Launch a web browser from a computer or wireless device that is connecte\
d to the 
network.
2.  T
ype  http://www.routerlogin.net  or http://www.routerlogin.com .
A login screen displays.
3.  Enter the router user name and password.
The user name is  admin. 
 The default password is password . The user name and 
password are case-sensitive.
The BASIC Home screen displays.
4.  Select  ADV
 ANCED > Setup > WAN Setup . 
5. In the MTU Size field, enter a value from 64 to 1500.
6.  Click the  Apply button.
Your change is saved.
If you suspect an MTU problem, a common solution is to change the MTU to\
 1400. If you are 
willing to experiment, you can gradually reduce the MTU from the maximum\
 value of 1500  
						

							Specify Your Internet Settings 23
 N150 and N300 Wireless Routers
until the problem goes away. The following table describes common MTU sizes and 
applications. 
Table 3.  Common MTU sizes 
 
MTUApplication
1500 The largest Ethernet packet size. This setting is typical for connections that do not use 
PPPoE or VPN, and is the default value for NETGEAR routers, adapters, an\
d switches.
1492 Used in PPPoE environments.
1472 Maximum size to use for pinging. (Larger packets are fragmented.)
1468 Used in some DHCP environments.
1460 Usable by AOL if you do not have large email attachments, for example.
1436 Used in PPTP environments or with VPN.
1400 Maximum size for AOL DSL.
576 Typical value to connect to dial-up ISPs.
  
						

							24
4
4.   Networking
This chapter includes the following sections:
•View or Change WAN Settings 
•Set Up a Default DMZ Server 
•Change the Router’s Device Name 
•Change the LAN TCP/IP Settings 
•Specify the IP Addresses that the Router Assigns 
•Disable the DHCP Server Feature in the Router 
•Reserve LAN IP Addresses 
•Use the WPS Wizard for WiFi Connections 
•Specify Basic WiFi Settings 
•Change the WiFi Security Option 
•Set Up a Guest Network 
•Control the Wireless Radio 
•Set Up a Wireless Schedule 
•Set up a Wireless Access List 
•Specify WPS Settings 
•Wireless Distribution System 
•Static Routes 
•View Devices Currently on the Network 
•Improve Network Connections with Universal Plug and Play  
						

							Networking 25
 N150 and N300 Wireless Routers
View or Change WAN Settings
You can view or configure wide area network (WAN) settings for the Internet port. You can set 
up a DMZ (demilitarized zone) server, change the maximum transmit unit (MTU) size, and 
enable the router to respond to a ping to its WAN (Internet) port. 
To view or change the WAN settings:
1.  Launch a web browser from a computer or wireless device that is connecte\
d to the 
network.
2.  T
ype  http://www.routerlogin.net  or http://www.routerlogin.com .
A login screen displays.
3.  Enter the router user name and password.
The user name is  admin. 
 The default password is password. The user name and 
password are case-sensitive.
The BASIC Home screen displays.
4.  Select 
ADVANCED > Setup > WAN Setup.
The following settings display: • Disable Port Scan and DoS Protection. DoS protection protects your LAN against 
denial of service attacks such as Syn flood, Smurf 

Attack, Ping of Death, and many 
others. Select this check box only in special circumstances. 
• Default DMZ Server . 
 This feature is sometimes helpful when you are playing online 
games or videoconferencing, but it makes the firewall security less effective. See  Set 
Up a Default DMZ Server  on page
  26.
• Respond to Ping on Internet Port . This 
 feature allows your router to be discovered. 
Use this feature only as a diagnostic tool or if you have a specific rea\
son. 
• MTU Size (in bytes). 
 The normal MTU (maximum transmit unit) value for most 
Ethernet networks is 1500 bytes, or 1492 bytes for PPPoE connections. Ch\
ange the  
						

							Networking 
26 N150 and N300 Wireless Routers 
MTU only if you are sure that it is necessary for your ISP connection. See Change the 
MTU Size on page 21.
•NAT Filtering. Network Address Translation (NAT) determines how the router 
processes inbound traffic:
-Secured NAT provides a secured firewall to protect the computers on the LAN 
from attacks from the Internet, but might prevent some Internet games, 
point-to-point applications, or multimedia applications from functioning. By default, 
the Secured radio button is selected.
-Open NAT provides a much less secured firewall, but allows almost all Internet 
applications to function.
•Disable SIP ALG. Some Voice over IP (VoIP) applications do not function well with 
the Session Initiation Protocol (SIP) Application Layer Gateway (ALG). Selecting the 
check box to turn off the SIP ALG might enable connected VoIP devices to create and 
accept a VoIP call through the router. By default, this check box is cleared.
•Disable IGMP Proxying. IGMP proxying allows computers on the LAN to receive the 
multicast traffic they are subscribed to from the Internet. By default, this check box is 
selected, and the IGMP proxy is disabled, preventing multicast traffic from the Internet 
to the LAN. Clear the Disable IGMP Proxying check box to allow multicast traffic 
from the Internet to the LAN.
•VPN Passthrough. The router supports VPN passthrough for IPSec, PPTP, and 
L2TP.
-IPSec Passthrough. To enable or disable IPSec passthrough, select the Enable 
or Disabled radio button.
-PPTP Passthrough. To enable or disable PPTP passthrough, select the Enable 
or Disabled radio button.
•L2TP Passthrough. To enable or disable L2TP passthrough, select the Enable or 
Disabled radio button. 
5. Change the settings as needed.
6. Click the Apply button.
Your changes are saved.
Set Up a Default DMZ Server
The default DMZ server feature is helpful when you are using some online games and 
videoconferencing applications that are incompatible with Network Address Translation 
(NAT). The router is programmed to recognize some of these applications and to work 
correctly with them, but other applications might not function well. In some cases, one local 
computer can run the application correctly if the IP address for that computer is entered as 
the default DMZ server. 
						

							Networking 
27  N150 and N300 Wireless Routers
WARNING:
DMZ servers pose a security risk. A computer designated as the 
default DMZ server loses much of the protection of the firewall and 
is exposed to exploits from the Internet. If compromised, the DMZ 
server computer can be used to attack other computers on your 
network.
The router detects and discards incoming traffic from the Internet that is not a response to 
one of your local computers or a service that you have configured in the Port Forwarding/Port 
Triggering screen. Instead of discarding this traffic, you can have the router forward the traffic 
to one computer on your network. This computer is called the default DMZ server.
To set up a default DMZ server: 
1. Launch a web browser from a computer or wireless device that is connected to the 
network.
2. Type http://www.routerlogin.net or http://www.routerlogin.com.
A login screen displays.
3. Enter the router user name and password.
The user name is admin. The default password is password. The user name and 
password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Setup > WAN Setup.
5. Select the Default DMZ Server check box.
6. Type the IP address.
7. Click the Apply button.
Your change is saved.
Change the Router’s Device Name
The router’s device name displays in file manager when you browse your network.
To change the router’s device name:
1. Launch a web browser from a computer or wireless device that is connected to the 
network.
2. Type http://www.routerlogin.net or http://www.routerlogin.com.
A login screen displays.
3. Enter the router user name and password. 
						

							Networking 
28 N150 and N300 Wireless Routers 
The user name is admin. The default password is password. The user name and 
password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Setup > LAN Setup.
5. In the Device Name field, type a new name.
6. Click the Apply button.
Your change is saved.
Change the LAN TCP/IP Settings
The router is preconfigured to use private IP addresses on the LAN side and to act as a 
DHCP server. The router’s default LAN IP configuration is as follows:
•LAN IP address. 192.168.1.1
•Subnet mask. 255.255.255.0
These addresses are part of the designated private address range for use in private networks 
and are suitable for most applications. If your network requires a different IP addressing 
scheme, you can change these settings
You might want to change these settings if you need a specific IP subnet that one or more 
devices on the network uses, or if you have competing subnets with the same IP scheme.
To change the LAN TCP/IP settings:
1. Launch a web browser from a computer or wireless device that is connected to the 
network.
2. Type http://www.routerlogin.net or http://www.routerlogin.com.
A login screen displays.
3. Enter the router user name and password.
The user name is admin. The default password is password. The user name and 
password are case-sensitive.
The BASIC Home screen displays. 
						

							Networking 29
 N150 and N300 Wireless Routers
4. 
Select  ADVANCED > Setup > LAN Setup .
5. In the IP Address field, type the IP address.
6.  In the IP Subnet Mask , type the subnet mask of the router. 
The IP address and subnet mask identifies which addresses are local to a\
 specific device  and which must be reached through a gateway or router.
7.  Click the  Apply button.
Your changes are saved.
If you changed the LAN IP address of the router, you are disconnected wh\
en this change 
takes ef
 fect.
8.  T
o reconnect, close your browser, relaunch it, and log in to the router
Specify the IP Addresses that the Router Assigns
By default, the router acts as a Dynamic Host Configuration Protocol (D\
HCP) server. The 
router  assigns IP, DNS server, and default gateway addresses to all computers connected to 
the LAN. The assigned default gateway address is the LAN address of the router. 
These addresses must be part of the same IP address subnet as the router\
’s LAN IP  address. Using the default addressing scheme, define a range between 192\
.168.1.2 and 
192.168.1.254, although you can save part of the range for devices with \
fixed addresses.
The router delivers the following parameters to any LAN device that requ\
ests DHCP: • An IP address from the range that you have defined
• Subnet mask
• Gateway IP address (the router’
 s LAN IP address)
• DNS server IP address (the router’
 s LAN IP address)
To specify the pool of IP addresses that the router assigns:
1. Launch a web browser from a computer or wireless device that is connecte\
d to the 
network. 
						

							Networking 30
N150 and N300 Wireless Routers 
2. 
Type  http://www.routerlogin.net  or http://www.routerlogin.com .
A login screen displays.
3.  Enter the router user name and password.
The user name is  admin. 
 The default password is password . The user name and 
password are case-sensitive.
The BASIC Home screen displays.
4.  Select  ADV
 ANCED > Setup > LAN Setup .
5. Make sure that the Use Router as DHCP Server  check box is selected.
6.  Specify the range of IP addresses that the router assigns:
a. In the Starting IP 
 Address field, type the lowest number in the range.
This IP address must be in the same subnet as the router.
b.  In the Ending IP 
 Address field, type the number at the end of the range of IP 
addresses.
This IP address must be in the same subnet as the router.
7.  Click the  Apply button.
Your settings are saved.
Disable the DHCP Server Feature in the Router
By default, the router acts as a DHCP server. The router  assigns IP, DNS server, and default 
gateway addresses to all computers connected to the LAN. The assigned default gateway 
address is the LAN address of the router.
You can use another device on your network as the DHCP server, or specify the network  settings of all your computers.