tcpdump异常结果，求助！

我的系统是gentoo x86_4 62006.1,
安装完成后配置了bonding, 从网上抄了个udp的小程序在上面跑，用TCPDUMP抓下的结果令人不解

tcpdump -i bond0 -nn 'port 6789 and src host 172.16.66.132' -vvv
执行的结果是
46 packets captured
92 packets received by filter
0 packets dropped by kernel


为什么是双倍的包被接收到了？请各位高手帮忙！