Virtual Servers; Virtual Server Overview - ZyXEL Communications Unified Security Gateway ZyWALL 300 User Manual

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H A P T E R
This chapter describes how to set up, manage, and remove virtual servers. First, it provides an
overview of virtual servers, and, then, it introduces the virtual server screens and commands.
See Section 5.4.18 on page 121

16.1 Virtual Server Overview

Virtual server is also known as port forwarding or port translation.
The virtual server changes the destination address of packets. This is also
known as Destination NAT (DNAT).
Virtual servers are computers on a private network behind the ZyWALL that you want to
make available outside the private network. If the ZyWALL has only one public IP address,
you can make the computers in the private network available by using ports to forward packets
to the appropriate private IP address.
In the ZyWALL, you set up a virtual server for each forwarding rule. The first part of the
virtual server defines the conditions required to forward the packet.
• Original IP - the original destination address; it can be an Ethernet, VLAN, bridge, or
PPPoE/PPTP interface; a specific IP address; or a HOST address object. (See
on page 515.)
• Protocol Type - the protocol [TCP, UDP, or both (Any)] used by the service requesting
the connection.
• Original Port(s) - the original destination port or range of destination ports. You might
use a range of destination ports for unknown services or when one server supports more
than one service.
The second part of the virtual server controls where the packet is forwarded if the conditions
are satisfied.
• Mapped IP - the translated destination address.
• Mapped Port(s) - the translated destination port or range of destination ports.
The original port range and the mapped port range must be the same size.
ZyWALL USG 300 User's Guide

Virtual Servers

for related information on these screens.
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