Nat Filtering; Disable Sip Alg; Dynamic Dns - NETGEAR DGND3800B User Manual

N600 Wireless Dual Band Gigabit VDSL2 Modem Router DGND3800B

NAT Filtering

This option determines how the router deals with inbound traffic. The Secured option
provides a secured firewall to protect the computers 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.

To enable dynamic DNS:
Select Advanced > Dynamic DNS to display the following screen.
1.
Access the website of one of the Dynamic DNS service providers whose names appear in
2.
the Service Provider drop-down list, and register for an account. For example, for
dyndns.org, go to www.dyndns.org.
Select the Use a Dynamic DNS Service check box.
3.
Select the name of your Dynamic DNS service provider.
4.
Advanced Settings
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