ZyXEL Communications ZYAIR G-4100 User Manual page 26

ZyAIR G-4100 User's Guide
PPTP Support
Point-to-Point Tunneling Protocol (PPTP) is a network protocol that enables secure transfer of data
from a remote client to a private server, creating a Virtual Private Network (VPN) using a TCP/IP-
based network. PPTP supports on-demand, multi-protocol and virtual private networking over public
networks, such as the Internet. Use PPTP to connect to a broadband modem to achieve access to high-
speed data networks via a familiar "dial-up networking" user interface.
PPPoE Support (RFC2516)
PPPoE (Point-to-Point Protocol over Ethernet) emulates a dial-up connection. It allows your ISP to
use their existing network configuration with newer broadband technologies such as ADSL. The
PPPoE driver on the ZyAIR is transparent to the computers on the LAN, which see only Ethernet and
are not aware of PPPoE thus saving you from having to manage PPPoE clients on individual
computers.
Network Address Translation (NAT)
NAT (Network Address Translation - NAT, RFC 1631) allows the translations of multiple IP
addresses used within one network to different IP addresses known within another network.
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 ZyAIR has built-in
DHCP server capability. It can assign IP addresses, an IP default gateway and DNS servers to DHCP
clients. The ZyAIR 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.
E-mail Forwarding
The ZyAIR is able to forward and retrieve e-mail messages when the subscriber's default email server
is down or behind a firewall.
DNS Proxy
With DNS proxy, the ZyAIR provides DNS redirection when a subscriber's configured DNS server is
behind a firewall or located in a private Intranet.
Local Subscriber Database
The ZyAIR allows you to maintain a subscriber database on the ZyAIR without setting up an external
RADIUS server. Subscriber accounting and authentication are done using the local subscriber
database.
RADIUS
The ZyAIR can use an external RADIUS (Remote Authentication Dial In User Service defined in
RFC2138 and 2139) server for subscriber authentication and accounting.
Accounting
The ZyAIR has a built-in accounting feature for keeping track of subscriber Internet usage time.
1-2 Getting to Know Your ZyAIR