IronPort Systems ZyAIR B-4000 - Manual (Page 24)

ZyAIR B-4000 Hot Spot Gateway
1-2 Getting to Know Your ZyAIR
With Secure Socket Layer (SSL) activated upon login, data exchanged between the ZyAIR and client
computers are encrypted and protected.
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.
Accounting
Accounting can be done using the built-in accounting feature.