ns2出现Client: Handoff Attempt的情况解决找到mac/mac-802_11.cc，这是系统本身一个bug，对于adhoc网络无需进行切换尝试。
>if (*rcount == 3 && handoff == 0){> //start handoff PRocess> printf("Client %d: Handoff Attempted\n",index_);> associated = 0;> authenticated = 0;> handoff = 1;> ScanType_ = ACTIVE;> sendPROBEREQ(MAC_BROADCAST);> return;> }改为>if (infra_mode_ && *rcount == 3 && handoff == 0){> //start handoff process> printf("Client %d: Handoff Attempted\n",index_);> associated = 0;> authenticated = 0;> handoff = 1;> ScanType_ = ACTIVE;> sendPROBEREQ(MAC_BROADCAST);> return;> }