Secure Roaming in 802.11 Networks

Roaming in 802.11 WLANs: General Principles

Ctl Dur

Destination

Address (DA)

Source Address

(SA )

Address 3

(Filtering)

Seq-

Ctl

22 2666

Address 4

(Optional)

FCS

64

Frame Body

0–2,312

Figure 3.11: An 802.11 Unicast Data Frame.

It should be noted that not all frames may be transmitted in every state. All three classes of

frames may be transmitted in state 3. Both classes 1 and 2 may be transmitted in the second

state. Only class 1 frames may be transmitted in state 1.

Figure 3.11 shows an 802.11 unicast data frame. The figure shows that the frame consists of

two bytes for frame control, two bytes for duration, six bytes for the DA, six bytes for the

source address, ...