Handoff Attempted

Hi,

I am running a MANET simulation (AODV, 802.11) in ns2.33. During my simulation, I get the following output from ns2:

Client 50: Handoff Attempted
Client 36: Handoff Attempted
Client 89: Handoff Attempted
[…]

It seems that this error message comes from mac/mac-802_11.cc. Could someone explain that to me? I would guess that the handoff is only applicable when using access points, but not in ad-hoc mode. Do I use the correct MAC protocol for MANET simulations? What is that Mac/Multihop protocol?
Thanks!

Here some of my parameters:

set opt(chan)     Channel/WirelessChannel

set opt(prop)     Propagation/TwoRayGround

set opt(netif)    Phy/WirelessPhy

set opt(mac)      Mac/802_11

set opt(ifq)      Queue/DropTail/PriQueue

set opt(ll)       LL

set opt(ant)      Antenna/OmniAntenna

set opt(ifqlen)   50         ;# max packet in ifq

set opt(rp)        AODV

Ulrich