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Page 46 / 101 Scroll up to view Page 41 - 45
Specify Network Settings
46
N600 WiFi Cable Modem Router Model C3700
To change the MTU size:
1.
Launch a web browser from a computer or wireless device that is connected to the
network.
2.
Type
http://routerlogin.net
or
.
A login screen displays.
3.
Enter the modem 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.
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
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.
Page 47 / 101
Specify Network Settings
47
N600 WiFi Cable Modem Router Model C3700
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 modem 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.
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 usually 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 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.
Launch a web browser from a computer or wireless device that is connected to the
network.
2.
Type
http://routerlogin.net
or
.
A login screen displays.
3.
Enter the modem 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.
1400
Maximum size for AOL DSL.
576
Typical value to connect to dial-up ISPs.
Table 2.
Common MTU sizes
(continued)
MTU
Application
Page 48 / 101
Specify Network Settings
48
N600 WiFi Cable Modem Router Model C3700
7.
Click the
Apply
button.
Your change takes effect.
Change the Modem Router’s Device Name
The modem router’s device name is C3700. This device name displays in file manager when
you browse your network.
To change the modem router’s device name:
1.
Launch a web browser from a computer or wireless device that is connected to the
network.
2.
Type
http://routerlogin.net
or
.
A login screen displays.
3.
Enter the modem 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 > LAN Setup
.
5.
In the
Device Name
field, type a new name.
6.
Click the
Apply
button.
Your change is saved.
Page 49 / 101
Specify Network Settings
49
N600 WiFi Cable Modem Router Model C3700
Change the LAN TCP/IP Settings
The modem router is 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 as follows:
•
LAN IP address
•
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://routerlogin.net
or
.
A login screen displays.
3.
Enter the modem 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 > LAN Setup
.
5.
In the
IP Address
field, type the IP address.
6.
In the
IP Subnet Mask
field type the subnet mask of the modem router.
Page 50 / 101
Specify Network Settings
50
N600 WiFi Cable Modem Router Model C3700
The IP address and subnet mask identify which addresses are local to a specific device
and which must be reached through a gateway or modem router.
7.
Click the
Apply
button.
Your changes are saved.
If you changed the LAN IP address of the modem router, you are disconnected when this
change takes effect.
To reconnect, close your browser, relaunch it, and log in to the modem router.
Specify the IP Addresses That the Modem Router Assigns
By default, the modem router acts as a Dynamic Host Configuration Protocol (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.
These addresses must be part of the same IP address subnet as the modem router’s LAN IP
address. Using the default addressing scheme, define a range between 192.168.0.2 and
192.168.0.254, although you can save part of the range for devices with fixed addresses.
To specify the pool of IP addresses that the modem router assigns:
1.
Launch a web browser from a computer or wireless device that is connected to the
network.
2.
Type
http://routerlogin.net
or
.
A login screen displays.
3.
Enter the modem 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.

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