DryTek Vigor 2952 series, Руководство пользователя

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Vigor2952 Series User’s Guide 146
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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 router to update its online WAN IP address mappings on the
specified Dynamic DNS server. Once the router is online, you will be able to use the registered
domain name to access the router or internal virtual servers from the Internet. It is
particularly helpful if you host a web server, FTP server, or other server behind the router.
Before you use the Dynamic DNS feature, you have to apply for free DDNS service to the DDNS
service providers. The router 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 router.
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The LAN DNS lets the network administrators host servers with privacy and security. When the
network administrators of your office set up FTP, Mail or Web server inside LAN, you can
specify specific private IP address (es) to correspondent servers. Thus, even the remote PC is
adopting public DNS as the DNS server, the LAN DNS resolution on Vigor2952 Series will
respond the specified private IP address.
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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 router 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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Remote Authentication Dial-In User Service (RADIUS) is a security authentication
client/server protocol that supports authentication, authorization and accounting, which is
widely used by Internet service providers. It is the most common method of authenticating
and authorizing dial-up and tunneled network users.
The built-in RADIUS client feature enables the router to assist the remote dial-in user or a
wireless station and the RADIUS server in performing mutual authentication. It enables
centralized remote access authentication for network management.
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Lightweight Directory Access Protocol (LDAP) is a communication protocol for using in TCP/IP
network. It defines the methods to access distributing directory server by clients, work on
directory and share the information in the directory by clients. The LDAP standard is
established by the work team of Internet Engineering Task Force (IETF).
As the name described, LDAP is designed as an effect way to access directory service without
the complexity of other directory service protocols. For LDAP is defined to perform, inquire
and modify the information within the directory, and acquire the data in the directory
securely, therefore users can apply LDAP to search or list the directory object, inquire or
manage the active directory.