3-2 数据包投递过程

数据包投递过程主机单播IP包发送上层协议要求发送数据包目的是否直连解析网关硬件地址解析目的主机硬件地址封装成帧并由相应接口发出YN路由器单播IP包转发目的是否本机数据包入站目的是否直连解析下一跳路由器硬件地址解析目的主机硬件地址封装成帧并由相应出接口发出提交本机上层协议处理YNYN主机接收IP包如果IP包的目的地址符合下列情况之一，则主机接收此包目的IP地址等于自己的IP地址目的IP地址是一个广播地址目的IP地址是一个组播地址，而本机的某个服务属于此组播组否则主机的网络层丢弃此IP包网络接口层提交接收的数据包目的是否本机丢弃解封装并提交给相应的协议处理YNLayer2AddressingLayer3AddressingHost-to-HostPacketDelivery(1of17)Host-to-HostPacketDelivery(2of17)Host-to-HostPacketDelivery(3of17)Host-to-HostPacketDelivery(4of17)Host-to-HostPacketDelivery(5of17)Host-to-HostPacketDelivery(6of17)Host-to-HostPacketDelivery(7of17)Host-to-HostPacketDelivery(8of17)Host-to-HostPacketDelivery(9of17)Host-to-HostPacketDelivery(10of17)Host-to-HostPacketDelivery(11of17)DestinationNextHopInterface192.168.3.0/24Connectedfa0/0192.168.4.0/24Connectedfa0/1Host-to-HostPacketDelivery(12of17)Host-to-HostPacketDelivery(13of17)Host-to-HostPacketDelivery(14of17)Host-to-HostPacketDelivery(15of17)Host-to-HostPacketDelivery(16of17)Host-to-HostPacketDelivery(17of17)