Roaming Guidelines - Proxim Harmony 8550 Manual

As shown in Figure 6, Access Point #3 is installed on the remote IP network but it is
partnered with the AP Controller located on the local IP subnet. The mobile client can
roam from Access Point #2 to Access Point #3 even though the Access Points are
located on different IP subnets and are separated by a router. The client maintains an
uninterrupted connection to the network and retains its assigned IP address that is valid
on the local subnet.
This feature requires that the network administrator configure the AP Controller with a
list of subnets used in the facility so the AP Controller and Access Points can communi-
cate with each other across the router. Refer to the Harmony Access Point Controller
Model 7560 User's Guide for more information.

Roaming Guidelines

G An 802.11b PC Card can only roam between 802.11b Access Points. An
802.11b PC Card cannot communicate with Harmony OpenAir Access Points.
G All Harmony 802.11b Access Points must have the same SSID.
G All workstations with Harmony 802.11b client adapters must have the same
SSID as the Access Points that they will roam between.
G If WEP encryption is enabled, then all 802.11b Access Points and client adapt-
ers must use the same encryption level and WEP Key(s) to communicate.
G The Access Points' cells must overlap to ensure that there are no gaps in
coverage and to ensure that the roaming client will always have a connection
available.
G If the Access Points are operating in Independent mode, all of the 802.11b
Access Points must be installed on the same IP subnet to support roaming.
G 802.11b Access Points support roaming across a router only when they are
operating in Dependent mode and are partnered with an AP Controller.
G All Access Points in the same vicinity should use a unique, independent
Channel. There are three independent Channels for 802.11b Access Points in
the United States: 1, 6, and 11.
28