3Com 3C16772 - OfficeConnect Web Site Filter, User Manual

Page: 146 / 182

146 A
PPENDIX
E: E
XAMPLE
C
ONFIGURATIONS
messages that the Internet Firewall sends out. This is not
a valid e-mail address, and so no e-mails can be returned
to it. However, you can change this e-mail address if you
want.
15 Load the Web Site Filter list.
a Click Filter , and then select the Filter Update tab.
b Click Download Now and wait for the filter list to
download. The progress is shown on the status bar at
the bottom of the screen.
c
If you want the Internet Firewall to check for updates
automatically every week, thus keeping it current, click
the
Automatic Download box, select a day the of week,
and type in a time.
d Click Updat e.
e Select the Settings tab, make sure that Log and Block
Access is selected, and click Block all categorie s. Click
Updat
e.
Increasing the number of IP addresses available using
NAT
In this example you also have 16 IP addresses assigned
statically by the ISP. However, the Internet access
requirements for the 16 PCs are as follows:
■
10 PCs are ordinary workstations, where Internet access
is only required for research, e-mail, and the like.
■
Three PCs are Internet servers (for example, Web or FTP
to promote business, or support clients)
■
Three PCs, although not servers, must be visible on the
Internet (that is, their IP address must be available on
the Internet for some unique function, such as
authentication). You have bought an Internet Firewall
DMZ for this application.
Of the IP addresses for these PCs (
172.20.54.210
to
172.20.54.225
inclusive), the PCs with the addresses
172.20.54.210, 209.1.54.211
, and
172.20.54.225
are the servers. The PCs with the addresses