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Page 36 / 129 Scroll up to view Page 31 - 35
Genie Advanced Home
36
N600 Wireless Dual Band Gigabit Router Premium Edition WNDR3800
WAN Setup
The WAN Setup screen lets you configure a DMZ (demilitarized zone) server, change the
Maximum Transmit Unit (MTU) size, and enable the router to respond to a ping on the WAN
(Internet) port. Select
Advanced > Setup > WAN Setup
to view the following screen:
•
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 and/or videoconferencing. Be careful when using this feature because it makes
the firewall security less effective. See the following section,
Default DMZ Server
for
more details.
•
Respond to Ping on Internet Port
. If you want the router to respond to a ping from the
Internet, select this check box. Use this only as a diagnostic tool because it allows your
router to be discovered. Do not select this check box unless you have a specific reason.
•
Disable IGMP Proxying
. IGMP proxying allows a computer on the local area network
(LAN) to receive the multicast traffic it is interested in from the Internet. You can select
this check box to disable the feature if you do not need it.
•
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, and should not be done unless you are
sure it is necessary for your ISP connection. See
Change the MTU Size
on page 37.
•
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. Open NAT provides a much
less secured firewall, but allows almost all Internet applications to function.
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Genie Advanced Home
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N600 Wireless Dual Band Gigabit Router Premium Edition WNDR3800
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 there are other applications that 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.
Incoming traffic from the Internet is usually discarded by the router unless the traffic is 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 it
forwarded to one computer on your network. This computer is called the default DMZ server.
To set up a default DMZ server, do the following:
1.
On the WAN Setup screen, select the
Default DMZ Server
check box.
2.
Type the IP address.
3.
Click
Apply
.
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 any device in the data path has a lower
MTU setting than the other devices, the data packets has to be split or “fragmented” to
accommodate the one with the smallest MTU.
The best MTU setting for NETGEAR equipment is often just the default value, and changing
the value might fix one problem but cause another. Leave 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 won’t open, or displays only part of a Web page
-
Yahoo email
-
MSN portal
-
America Online’s DSL service
Page 38 / 129
Genie Advanced Home
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N600 Wireless Dual Band Gigabit Router Premium Edition WNDR3800
•
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 such as the inability to access certain Web sites, frames
within Web sites, 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 and the default value. This is the typical setting for
non-PPPoE, non-VPN connections, and is the default value for NETGEAR 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 new size between 64 and 1500.
3.
Click
Apply
to save the settings.
Page 39 / 129
Genie Advanced Home
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N600 Wireless Dual Band Gigabit Router Premium Edition WNDR3800
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 router is shipped 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:
•
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 should be suitable for most applications. If your network has a requirement to use a
different IP addressing scheme, you can make those changes in the LAN Setup screen.
To change the LAN settings:
Note:
If you change the LAN IP address of the router while connected
through the browser, you will be disconnected. You will have to open
a new connection to the new IP address and log in again.
1.
Select
Advanced > Setup > LAN Setup
to display the following screen:
2.
Enter the settings that you want to customize. These settings are described in the following
section,
LAN Setup Screen Settings
.
3.
Click
Apply
to save your changes.
Page 40 / 129
Genie Advanced Home
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N600 Wireless Dual Band Gigabit Router Premium Edition WNDR3800
LAN Setup Screen Settings
LAN TCP/IP Setup
•
IP Address
. The LAN IP address of the router.
•
IP Subnet Mask
. The LAN subnet mask of the router. Combined with the IP address, the
IP subnet mask allows a device to know which other addresses are local to it, and which
have to be reached through a gateway or router.
•
RIP Direction
. Router Information Protocol (RIP) allows a router to exchange routing
information with other routers. This setting controls how the router sends and receives
RIP packets. Both is the default setting. With the Both or Out Only setting, the router
broadcasts its routing table periodically. With the Both or In Only setting, the router
incorporates the RIP information that it receives.
•
RIP Version
. This controls the format and the broadcasting method of the RIP packets
that the router sends. It recognizes both formats when receiving. By default, the RIP
function is disabled.
RIP-1
is universally supported. It is adequate for most networks, unless you have an
unusual network setup.
RIP-2
carries more information. Both RIP-2B and RIP-2M send the routing data in RIP-2
format. RIP-2B uses subnet broadcasting. RIP-2M uses multicasting.
Use Router as a DHCP Server
This check box is usually selected so that the router functions as a Dynamic Host
Configuration Protocol (DHCP) server.
•
Starting IP Address
. Specify the start of the range for the pool of IP addresses in the
same subnet as the router.
•
Ending IP Address
. Specify the end of the range for the pool of IP addresses in the
same subnet as the router.
Address Reservation
When you specify a reserved IP address for a computer on the LAN, that computer receives
the same IP address each time it accesses the router’s DHCP server. Assign reserved IP
addresses to servers that require permanent IP settings.
Use the Router as a DHCP Server
By default, the router functions as a DHCP server, allowing it to assign IP, DNS server, and
default gateway addresses to all computers connected to the router’s LAN. The assigned
default gateway address is the LAN address of the router. The router assigns IP addresses to
the attached computers from a pool of addresses specified in this screen. Each pool address
is tested before it is assigned to avoid duplicate addresses on the LAN. For most
applications, the default DHCP and TCP/IP settings of the router are satisfactory.

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