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MTU Size (in bytes) The normal maximum transmission unit (MTU) value for most Ethernet networks is 1500 bytes, 1492 bytes for PPPoE connections, and 1458 for PPPoA connections. For some ISPs you might need to reduce the MTU. But this is rarely required, and should not be done unless you are sure it is necessary for your ISP connection. NAT Filtering This option determines how the router deals with inbound traffic. The Secured option provides a secured firewall to protect the PCs on LAN from attacks from the Internet, but it might cause some Internet games, point-to-point applications, and multimedia applications no work. The Open option, on the other hand, provides a much less secured firewall, while it allows almost all Internet applications to work. Disable SIP ALG The Session Initiation Protocol (SIP) Application Level Gateway (ALG) is enabled by default to optimize VoIP phone calls that use the SIP. The Disable SIP ALG check box allows you to disable the SIP ALG. Disabling the SIP ALG might be useful when running certain applications. Dynamic DNS If your network has a permanently assigned IP address, you can register a domain name and have that name linked with your IP address by public Domain Name Servers (DNS). However, if your Internet account uses a dynamically assigned IP address, you do not know in advance what your IP address is, and the address can change frequently. In this case, use a commercial Dynamic DNS service that lets you register your domain to its IP address and forwards traffic directed at your domain to your frequently changing IP address. The router has a client that can connect to a Dynamic DNS service provider. Once you have configured your ISP account information in the router, whenever your ISP-assigned IP address changes, your router contacts your Dynamic DNS service provider, logs in to your account, and registers your new IP address. 1. Select Advanced > Dynamic DNS to display the following screen. Figure 49. Dynamic DNS screen 2. Access the website of one of the Dynamic DNS service providers whose names appear in the Service Provider drop-down list, and register for an account. For example, for dyndns.org, go to 3. Select the Use a Dynamic DNS Service check box. 4. Select the name of your Dynamic DNS service provider. 5. Type the host name that your Dynamic DNS service provider gave you. The Dynamic DNS service provider might call this the domain name. If your URL is myName.dyndns.org, then your host name is myName. 6. Type the user name for your Dynamic DNS account. 7. Type the password (or key) for your Dynamic DNS account. 8. If your Dynamic DNS provider allows the use of wildcards in resolving your URL, you can select the Use Wildcards check box to activate this feature. For example, the wildcard feature causes *.yourhost.dyndns.org to be aliased to the same IP address as yourhost.dyndns.org. 9. Click Apply to save your settings. Note: If your ISP assigns a private WAN IP address such as 192.168.x.x or 10.x.x.x, the Dynamic DNS service will not work because private addresses are not routed on the Internet. LAN Setup The LAN Setup screen allows configuration of LAN IP services such as DHCP and Routing Information Protocol (RIP). The wireless modem router is shipped preconfigured to use private IP addresses on the LAN side and to act as a DHCP server. The wireless modem router’s default LAN IP configuration is as follows: • LAN IP address. 192.168.0.1 • Subnet mask. 255.255.255.0 These addresses are part of the private address range designated by the Internet Engineering Task Force (IETF for use in private networks, and should be suitable in most applications. If your network has a requirement to use a different IP addressing scheme, you can make those changes in the LAN IP Setup screen. Note: If you change the LAN IP address of the wireless modem router while connected through the browser, you are disconnected. To reconnect, open a new connection to the new IP address and log in. 1. Select Advanced > LAN Setup. Figure 50. LAN Setup screen 2. Enter the LAN Setup configuration and click Apply to save your changes. Note: The default DHCP and TCP/IP values work for most users. • Device Name. This is an abbreviated name of the wireless modem router. You see this name for the router in Network Explorer on Windows systems. • Use Auto IP. Select this check box if you want the wireless modem router to set up the LAN IP addresses automatically. • IP Address. The LAN IP address of the wireless modem router. • IP Subnet Mask. The LAN subnet mask of the wireless modem router. Combined with the IP address, the IP subnet mask allows a device to know which other addresses are local to it, and which have to be reached through a gateway or wireless modem router. • Use Router as DHCP Server. By default, the wireless modem router functions as a Dynamic Host Configuration Protocol (DHCP) server, allowing it to assign IP, DNS server, and default gateway a...