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The default setting of the
Connection Mode
menu is
Always On
to provide a steady IPv6
connection. The modem router never terminates the connection. If the connection is
terminated, for example, when the modem is turned off, the modem router attempts to
reestablish the connection immediately after the PPPoE connection becomes available again.
Note
9.
Select an IP Address Assignment radio button:
•
Use DHCP Server
. The modem router assigns IPv6 addresses to the devices on your home network (the
LAN) through a DHCP server.This method passes more information to LAN devices, but some IPv6 systems
might not support the DHCPv6 client function. This is the default setting.
•
Auto Config
. The modem router automatically configures its IPv6 address based on the IPv6 protocol.
10.
To specify the interface ID for the IPv6 address of the modem router’s LAN interface, select the
Use This
Interface ID
check box, and enter the interface ID.
If you do not specify an ID here, the modem router generates one automatically from its MAC address.
11.
Select the IPv6 filtering mode:
•
Secured
. In secured mode, which is the default mode, the modem router inspects both TCP and UDP packets
•
Open
. In open mode, the modem router inspects UDP packets only.
12.
Click the
Apply
button.
Your settings are saved.
Set Up an IPv6 Connection Through Auto Config
If your Internet connection does not use PPPoE, DHCP, a fixed IP address, or pass-through but is IPv6, use the
Auto Config connection type, which lets the modem router autoconfigure its IPv6 connection.
To set up an IPv6 Internet connection through autoconfiguration:
1.
Launch a web browser from a computer or WiFi device that is connected to the network.
2.
Enter
.
A login window opens.
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 page displays.
4.
Select
ADVANCED > Advanced Setup > IPv6
.
The IPv6 page displays.
Manage the Internet Settings Manually
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Nighthawk X4S AC2600 WiFi VDSL/ADSL Modem Router Model D7800
Page 92 / 299
5.
From the
Internet Connection Type
menu, select
Auto Config
.
The modem router automatically detects the information in the following fields:
•
Router’s IPv6 Address On WAN
.This field shows the IPv6 address that is acquired for the modem router’s
WAN (or Internet) interface. The number after the slash (/) is the length of the prefix, which is also indicated
by the underline (_) under the IPv6 address. If no address is acquired, the field displays Not Available.
•
Router’s IPv6 Address On LAN
.This field shows the IPv6 address that is acquired for the modem router’s
LAN interface.The number after the slash (/) is the length of the prefix, which is also indicated by the underline
(_) under the IPv6 address. If no address is acquired, the field displays Not Available.
6.
If your ISP gave you a specific user class, in the
DHCP User Class (If Required)
field, enter the user class.
If your ISP did not give you a specific user class, leave this field blank.
7.
To specify a domain name, in the
DHCP Domain Name (If Required)
field, enter a domain name.
If your ISP gave you a specific domain name, enter it in this field. (For example, Earthlink Cable might require
a host name of
home
, and Comcast sometimes supplies a domain name.)
If your ISP did not give you a specific domain name, you can either leave this field blank or enter the domain
name of your IPv6 ISP. (Do not enter the domain name for the IPv4 ISP here.) For example, if your ISP’s mail
server is mail.xxx.yyy.zzz, enter xxx.yyy.zzz as the domain name.
8.
Select an IP Address Assignment radio button:
•
Use DHCP Server
. The modem router assigns IPv6 addresses to the devices on your home network (the
LAN) through a DHCP server.This method passes more information to LAN devices, but some IPv6 systems
might not support the DHCPv6 client function.
•
Auto Config
. This is the default setting.
9.
To specify the interface ID for the IPv6 address of the modem router’s LAN interface, select the
Use This
Interface ID
check box, and enter the interface ID.
Manage the Internet Settings Manually
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Page 93 / 299
If you do not specify an ID here, the modem router generates one automatically from its MAC address.
10.
Select the IPv6 filtering mode:
•
Secured
. In secured mode, which is the default mode, the modem router inspects both TCP and UDP packets.
•
Open
. In open mode, the modem router inspects UDP packets only.
11.
Click the
Apply
button.
Your settings are saved.
Manage the MTU Size
The maximum transmission unit (MTU) is the largest data packet a network device transmits.
MTU Concepts
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 uses a lower maximum transmission unit (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 experience severe performance problems.
•
You used a program to optimize MTU for performance reasons and now you are experiencing connectivity or
performance problems.
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.
Manage the Internet Settings Manually
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Table 3. Common MTU sizes
Application
MTU
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.
1500
Used in PPPoE environments.
1492
Maximum size to use for pinging. (Larger packets are fragmented.)
1472
Used in some DHCP environments.
1468
Usable by AOL if you do not send or receive large email attachments, for example.
1460
Used in PPPoA environments.
1458
Used in PPTP environments or with VPN.
1436
Maximum size for AOL DSL.
1400
Change the MTU Size
WARNING:
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. Change the MTU only if you are sure that it is
necessary for your ISP connection.
To change the MTU size:
1.
Launch a web browser from a computer or WiFi device that is connected to the network.
2.
Enter
.
A login window opens.
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 page displays.
4.
Select
ADVANCED > Setup > WAN Setup
.
The WAN Setup page displays.
Manage the Internet Settings Manually
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5.
In the
MTU Size
field, enter a value from 616 to 1500.
The normal MTU (maximum transmit unit) value for most Ethernet networks is 1500 bytes, 1492 bytes for PPPoE
connections, or 1436 for PPTP connections.
6.
Click the
Apply
button.
Your settings are saved.
Manage the Internet Settings Manually
95
Nighthawk X4S AC2600 WiFi VDSL/ADSL Modem Router Model D7800

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