Dns Proxy - ZyXEL Communications VSG-1200 User Manual

DHCP Support
DHCP (Dynamic Host Configuration Protocol) allows the individual computers (DHCP
clients) to obtain TCP/IP configuration at start-up from a centralized DHCP server. The VSG
has built-in DHCP server capability. It can assign IP addresses, an IP default gateway and
DNS servers to DHCP clients. The VSG can also act as a surrogate DHCP server (DHCP
Relay) where it relays IP address assignment from the actual real DHCP server to the DHCP
clients.
RADIUS (Remote Authentication Dial-In User Service) Client
The VSG allows you to maintain a central subscriber database on an external RADIUS server.
Subscriber accounting and authentication is then done through the external RADIUS server. In
addition, the VSG supports Vendor Specific Attributes (VSAs) that allows enforcement of
upload/download bandwidth limits or specific advertisement web page per subscriber.
Built-in Authentication and Local Subscriber Database
The VSG allows you to maintain a subscriber database on the VSG without setting up an
external RADIUS server. Subscriber accounting and authentication are done using the local
subscriber database.
Accounting
Accounting can be done using an external RADIUS server or the built-in accounting feature.
Local Content and Advertising Links
Once connected to the network, the VSG can redirect the subscriber to a specified web site and
display advertising links. This can be a source of extra online advertising revenues and
increased business exposure.
Access Control (Walled Garden)
With the walled garden feature, subscribers are able to access predetermined web sites without
logging in. The VSG blocks full Internet access until the subscribers log in.
E-mail Forwarding
The VSG is able to forward and retrieve e-mail messages when the subscriber's default e-mail
server is down or behind a firewall.

DNS Proxy

With DNS proxy, the VSG provides DNS redirection when a subscriber's configured DNS
server is behind a firewall or located in a private Intranet.
Chapter 1 Getting to Know Your VSG
VSG-1200 User's Guide
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