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43
7.2.1.2 Add VLAN Interface
VLAN means Virtual Local Area Network and is used to divide a physical network into ser-
veral logical nets. Several networks kann be used to structure the whole intranet. You can
split the network by organization into units, groups or by spatial properties like floor or build-
ings.
Actually you need one interface for every network. VLAN interfaces of the appliance are vir-
tual interfaces that are bound to one physical interface. So you can conduct all virtual LANs
at one interface. Every VLAN has an ID, which is append at the packets as a tag. On the
basis of thee tags, a VLAN supporting switch can direct to packets to the right VLAN.
Appliance
Switch
VLAN1
VLAN2
VLAN3
fig. 43 VLAN formation