User manual

Introduction
2
The SG565, SG560, SG570, SG575 and SG580 may also connect to a DMZ
(demilitarized zone) network. A DMZ is a separate local network typically used to host
servers accessible to the outside world. It is separated both physically and by the
firewall, in order to shield your LAN from external traffic.
The SG unit allows you to establish a virtual private network (VPN). A VPN enables
remote workers or branch offices to connect securely to your LAN over the public
Internet. The SG unit can also connect to external VPNs as a client. The SG550,
SG560, SG565, SG570, SG575 and SG580 utilize onboard cryptographic acceleration to
ensure excellent VPN throughput.
The SG unit may be configured with multiple Internet connections. These auxiliary
connections may be kept on stand-by should the primary connection become
unavailable, or maintained concurrently with the primary connection for spreading
network load.
The SG565, SG570, SG575 and SG580 incorporate a powerful web proxy cache to
improve web page response time and reduce link loads. It is designed to integrate
seamlessly with upstream proxy caches provided by ISPs.
Front panel LEDs
The front and rear panels contain LEDs indicating status. An example of the front panel
LEDs are illustrated in the following figure and detailed in the following table.
Note
Not all the LEDs described below are present on all SG unit models. Labels vary from
model to model.
Label Activity Description
Power
On Power is supplied to the SG unit
Flashing The SG unit is operating correctly
Heart Beat
On If this LED is on and not flashing, an operating
error has occurred.
LAN Activity
Flashing Network traffic on the LAN network interface