ZyXEL Communications ZyXEL ZyWALL IDP 10 - Manual (Page 17)

ZyWALL IDP10 User’s Guide
Introducing the ZyWALL IDP 10 1-3
System Management
Console (RS-232)
Web-based GUI (HTTP)
Command line interface
SNMP v2c
1.3 Application Examples
You can install a ZyWALL either between the firewall (or switch) and Internet (see Figure 1-2) to
protect your local networks and firewall (or switch) from intrusions from the Internet, behind the
firewall (or switch) to protect the DMZ servers from intrusions from the local network (due to an
infected LAN computer, for example), or ideally, install one in front of the firewall and two others
behind the firewall.
In installation example 1 (Figure 1-2) the ZyWALL (A) protects the firewall/router (B), DMZ servers
and LAN computers from network intrusions from the Internet. However, it does not protect the DMZ
servers from intrusions from the LAN (and vice versa), and the ZyWALL itself is vulnerable, as it
does not receive firewall protection.
Figure 1-2 Installation Example 1