Specify Network Settings

46

AC1750 WiFi Cable Modem Router

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 1.

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 use 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.

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AC1750 WiFi Cable Modem Router

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 configured in the Port

Forwarding/Port Triggering screen. Instead of discarding this traffic, the modem router can

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.

7.

Click the

Apply

button.

Your change takes effect.

Specify Network Settings

48

AC1750 WiFi Cable Modem Router

Change the Modem Router’s Device Name

The modem router’s device name is C6300. This device name displays in a 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.

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

. 192.168.0.1

•

Subnet mask

. 255.255.255.0

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AC1750 WiFi Cable Modem Router

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 use, or if you use 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.

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 Network Settings

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AC1750 WiFi Cable 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.

The modem router delivers the following parameters to any LAN device that requests DHCP:

•

An IP address from the range that you defined

•

Subnet mask

•

Gateway IP address (the modem router’s LAN IP address)

•

DNS server IP address (the modem router’s LAN IP address)



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.

4.

Select

ADVANCED > Setup > LAN Setup

.