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The ISP often provides you with a dynamic IP address when you connect to the Internet via
your ISP. It means that the public IP address assigned to your router changes each time you
access the Internet. The Dynamic DNS feature lets you assign a domain name to a dynamic
WAN IP address. It allows the modem to update its online WAN IP address mappings on the
specified Dynamic DNS server. Once the modem is online, you will be able to use the
registered domain name to access the modem or internal virtual servers from the Internet. It
is particularly helpful if you host a web server, FTP server, or other server behind the modem.
Before you use the Dynamic DNS feature, you have to apply for free DDNS service to the DDNS
service providers. The modem provides up to three accounts from three different DDNS
service providers. Basically, Vigor routers are compatible with the DDNS services supplied by
most popular DDNS service providers such as www.dyndns.org, www.no-ip.com,
www.dtdns.com, www.changeip.com, www.dynamic- nameserver.com. You should visit
their websites to register your own domain name for the modem.
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The Vigor router has a built-in clock which can update itself manually or automatically by
means of Network Time Protocols (NTP). As a result, you can not only schedule the modem to
dialup to the Internet at a specified time, but also restrict Internet access to certain hours so
that users can connect to the Internet only during certain hours, say, business hours. The
schedule is also applicable to other functions.
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The UPnP (Universal Plug and Play) protocol is supported to bring to network connected
devices the ease of installation and configuration which is already available for directly
connected PC peripherals with the existing Windows 'Plug and Play' system. For NAT routers,
the major feature of UPnP on the modem is "NAT Traversal". This enables applications inside
the firewall to automatically open the ports that they need to pass through a router.
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IGMP is the abbreviation of Internet Group Management Protocol. It is a communication
protocol which is mainly used for managing the membership of Internet Protocol multicast
groups. For invoking IGMP Snooping function, you have to check the Enable IGMP Proxy box
first for activating the IGMP proxy function.
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Vigor122 User's Guide
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