N300 WiFi Router (N300R) User Manual
4-10 Customizing Your Network Settings
May 2012
Setting the MTU Size
The normal MTU value for most Ethernet networks is 1500 bytes, 1492 bytes for PPPoE
connections, or 1450 for PPTP connections. For some ISPs, you might need to reduce the MTU
size, but this is rarely required and should not be done unless you are sure it is necessary for your
ISP connection. For more information, see “Changing the MTU Size” on page 5-16.
To change the MTU size:
1. In the MTU Size field, enter a new size between 64 and 1500.
2. Click Apply to save the new configuration.
Configuring 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. For more information about NAT, see “How Your Computer
Accesses a Remote Computer through Your Router” on page 5-2.
To change the NAT option:
1. In the NAT Filtering area, select either the Secured or the Open radio button.
2. Click Apply to save the new configuration.
Configuring Static Routes
Static routes provide additional routing information to your router. Under usual circumstances, the
router has adequate routing information after it has been configured for Internet access, and you do
not need to configure additional static routes. You must configure static routes only for unusual
cases such as multiple routers or multiple IP subnets located on your network.
As an example of when a static route is needed, consider the following case:
• Your primary Internet access is through a cable modem to an ISP.
• You have an ISDN router on your home network for connecting to the company where you are
employed. This router’s address on your LAN is 192.168.1.100.
• Your company’s network address is 134.177.0.0.
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