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Page 36 / 133 Scroll up to view Page 31 - 35
NETGEAR genie Advanced Home
36
N300 Wireless ADSL2+ Modem Router DGN2200v4
•
To use the PIN method, select the
PIN Number
radio button, enter the client security
PIN, and click
Next
.
Within 2 minutes, go to the client device and use its WPS software to join the network
without entering a password.
The modem router attempts to add the WPS-capable device. The WPS LED
on the
front of the modem router blinks green. When the modem router establishes a WPS
connection, the LED is solid green, and the modem router WPS screen displays a
confirmation message.
WAN Setup
You can use the WAN Setup screen to specify the ADSL or Ethernet port setting for your
Internet connection, though by default the modem router automatically detects the Internet
port. The WAN Setup screen also lets you configure a DMZ (demilitarized zone) server,
change the maximum transmit unit (MTU) size, and enable the modem router to respond to a
ping on the WAN (Internet) port.
To view or change the WAN settings:
1.
Select
Advanced > Setup > WAN Setup
.
2.
Specify the settings for your Internet connection.
The fields in this screen are described in the following section.
3.
Click
Apply
.
Page 37 / 133
NETGEAR genie Advanced Home
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N300 Wireless ADSL2+ Modem Router DGN2200v4
WAN Setup Screen Fields
The following fields are available:
•
WAN Preference
. By default this field is set to Auto-Detect so that the modem router
automatically detects if the Internet connection is through the ADSL port or the
WAN/Ethernet port 4. You can use this field to select Must use DSL WAN or Must use
Ethernet WAN.
•
Use port 4 as
. By default, Auto-Detect is selected so that the modem router detects if
Ethernet port 4 is used as a LAN or WAN port. For example, if you connect a computer to
Ethernet port 4, then it works as a LAN port. You can select LAN or WAN if you do not
want to use the auto-detect setting.
•
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, Teardrop Attack,
UDP Flood, ARP Attack, Spoofing ICMP, Null Scan, and many others. This should be
disabled only in special circumstances.
•
Default DMZ Server
. This feature is sometimes helpful when you are playing online
games or videoconferencing. Be careful when using this feature because it makes the
firewall security less effective. See the following section,
Default DMZ Server
.
•
Respond to Ping on Internet Port
. If you want the modem router to respond to a ping
from the Internet, select this check box. Use this feature only as a diagnostic tool
because it allows your modem router to be discovered. Do not select this check box
unless you have a specific reason.
•
Disable IGMP Proxying
. The IGPM proxying feature lets a LAN computer receive the
multicast traffic directed to it from the Internet. Selecting this check box prevents this from
occurring.
•
MTU Size (in bytes)
. The normal MTU (maximum transmit unit) value for most Ethernet
networks is 1500 bytes, or 1492 bytes for PPPoE connections. For some ISPs, you might
need to reduce the MTU. This is rarely required. You should change the setting in this
field only if you are sure that it is necessary for your ISP connection. See
Change the
MTU Size
on page
38.
•
NAT Filtering
. Network Address Translation (NAT) determines how the modem 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. Open
NAT provides a much less secured firewall, but allows almost all Internet applications to
function.
•
Disable SIP ALG
. The Session Initiation Protocol (SIP) Application Level Gateway (ALG)
is enabled by default to optimize VoIP phone calls that use the SIP. Select the
Disable
SIP ALG
check box to disable the SIP ALG. Disabling the SIP ALG might be useful when
you are running certain applications.
Page 38 / 133
NETGEAR genie Advanced Home
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N300 Wireless ADSL2+ Modem Router DGN2200v4
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 modem router recognizes some of these applications and works correctly with
them, but other applications might not function well. In some cases, one local computer can
run the application correctly if that computer’s IP address is entered as the default DMZ
server.
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 modem router discards traffic from the Internet that is not a response to one of your
computers or a service that you have set up in the Port Forwarding/Port Triggering screen.
Instead of discarding this traffic, you can have the modem 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.
Select
Advanced > Setup > WAN Setup
. screen.
2.
Select the
Default DMZ Server
check box.
3.
Type the IP address.
4.
Click
Apply
.
Your changes are saved.
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 are split or “fragmented” to accommodate the
device with the smallest MTU.
The best MTU setting for NETGEAR equipment is often just 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 have 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
Page 39 / 133
NETGEAR genie Advanced Home
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N300 Wireless ADSL2+ Modem Router DGN2200v4
-
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.
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.
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
until the problem goes away. The following table describes common MTU sizes and
applications.
Table 2.
Common MTU sizes
MTU
Application
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 modem routers, adapters, and
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.
To change the MTU size:
1.
Select
Advanced > Setup > WAN Setup
.
2.
In the MTU Size field, enter a value from 64 to 1500.
3.
Click
Apply
.
Your change is saved.
Page 40 / 133
NETGEAR genie Advanced Home
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N300 Wireless ADSL2+ Modem Router DGN2200v4
LAN Setup
The LAN Setup screen allows configuration of LAN IP services such as Dynamic Host
Configuration Protocol (DHCP) and Routing Information Protocol (RIP). The modem router is
shipped preconfigured to use private IP addresses on the LAN side and to act as a DHCP
server. The modem router’s default LAN IP configuration is:
•
LAN IP address.
192.168.0.1
•
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.
By default, the modem router acts as a DHCP server. The modem 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 modem router. The modem router tests
each address before it is assigned to avoid duplicate addresses on the LAN. For most
applications, the default DHCP and TCP/IP settings of the modem router are satisfactory.
The modem router delivers the following parameters to any LAN device that requests DHCP:
•
IP address
•
Subnet mask
•
Gateway IP address (the modem router’s LAN IP address)
•
Primary DNS server (if specified in the Internet Setup screen), otherwise, the modem
router’s LAN IP address)
•
Secondary DNS server if you entered this in the Internet Setup screen
If you change the LAN IP address of the modem router while connected through the browser,
you are disconnected from the network.
To change the LAN settings:
1.
Select
Advanced > Setup > LAN Setup
.

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