User's Manual Part 1

Configuring Network Settings
Chapter 5: Managing Your Network 113
4. In the IP Address field, type the IP address to use as the OfficeMode network's
default gateway.
Note: The OfficeMode network must not overlap other networks.
5. In the Subnet Mask text box, type the OfficeMode internal network range.
6. If desired, enable or disable Hide NAT.
See Enabling/Disabling Hide NAT on page 109.
7. If desired, configure DHCP options.
See Configuring DHCP Server Options on page 103.
8. Click Apply.
A warning message appears.
9. Click OK.
A success message appears.
Configuring VLANs
Your Safe@Office appliance allows you partition your network into several virtual
LAN networks (VLANs). A VLAN is a logical network behind the Safe@Office
appliance. Computers in the same VLAN behave as if they were on the same
physical network: traffic flows freely between them, without passing through a
firewall. In contrast, traffic between a VLAN and other networks passes through
the firewall and is subject to the security policy. By default, traffic from a VLAN to
any other internal network (including other VLANs) is blocked. In this way,
defining VLANs can increase security and reduce network congestion.
For example, you can assign each division within your organization to a different
VLAN, regardless of their physical location. The members of a division will be
able to communicate with each other and share resources, and only members who
need to communicate with other divisions will be allowed to do so. Furthermore,