User's Manual

Virtual Network Services
hwc_vnsintro.fm
Setting up a VNS checklist
A31003-W1050-U100-2-7619
, March 2008
148 HiPath Wireless Controller, Access Points and Convergence Software V5 R1 , C20/C2400 User Guide
These IP addresses are not virtual IP addresses. They are regular IP
addresses and are unique over the network. These IP addresses are
advertised to other hosts on the network to exchange traffic with the wireless
devices in the VNS.
• A single overall filtering policy applies to all the wireless devices within the
VNS. Additional filtering can be applied when the wireless user is
authenticated by the Remote Authentication Dial-In User Service (RADIUS)
server. This does not apply for a bridged VNS.
• When the HiPath Wireless Controller creates a VNS, it also creates a virtual
IP subnet for that VNS. This does not apply for a bridged VNS.
• Each VNS represents a mobility group that, when configured, can be carried
across multiple HiPath Wireless Controllers. This does not apply for a bridged
VNS.
• Each VNS also offers unique Authentication, Authorization and Accounting
(AAA) services.
5.2 Setting up a VNS checklist
VNS provides a versatile means of mapping wireless networks to the topology of
an existing wired network. When you set up a VNS on the HiPath Wireless
Controller, you are defining a subnet for a group of wireless device users. The
VNS definition creates a virtual IP subnet where the HiPath Wireless Controller
acts as a default gateway to wireless devices.
In addition you can determine if the VNS is to apply for traffic bridging at the AP.
This type of VNS requires specification of RF parameters and authentication
parameters (if AAA type), although filtering specifications and topology
specifications do not apply.
The HiPath Wireless Controller C20/C2400 provides the option to define a VNS
as locally bridged to a VLAN at the controller. To support that configuration, you
must define which VLAN the VNS should bridge to. With this configuration, it is
possible that the controller is not involved in the IP address assignment for user
addresses. Instead, the IP addresses for users are assigned directly by the
DHCP infrastructure that services the VLAN.
Note: In a VLAN-bridged VNS, the default configuration dictates that the
controller is not the DHCP server for that segment. However, DHCP services can
selectively be enabled, including DHCP Relay, allowing you to use the controller
to become the default DHCP server for the VLAN, if applicable.
Before defining a VNS, the following properties must be determined: