Manage the Internet Settings Manually
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N150 and N300 WiFi DSL Modem Routers
If your ISP did not provide a service name, leave this field blank.
Note: 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.
10. 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 DHCv6 client function.
This is the default setting.
•Auto Config. The modem router automatically configures its IPv6 address based on the
IPv6 protocol.
11. (Optional) Select the Use This Interface ID check box and specify the interface ID that you
want to be used for the IPv6 address of the modem router’s LAN interface.
If you do not specify an ID here, the modem router generates one automatically from its
MAC address.
12. (Optional) Change the NAT filtering mode:
•Secured. In secured mode, the modem router inspects both TCP and UDP packets.
•Open. In open mode, the modem router inspects UDP packets only. This is the
default mode.
13. 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 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.