使用libpcap速度限制发送数据包

Question

I wrote a program that captures Ethernet packets from some NIC (ie eth0) at high speed (about 1Gbps) and forward traffic using pcap_sendpacket() to another NIC (ie eth1).

While the forwarder Ethernet interface is not connected to another computer NIC, forwarding speed is desired, but when I connect it, sending speed gets down awfully (from 900 Mbps to 100 Mbps).

Can anybody explain the reason?

_{OS : Kubuntu linux 10.10
Language : C++
Library : Libpcap}

Answer 1

因为目标NIC是100 Bbps接口：D：p

Answer 2

或者网络设备的自动协商已关闭，并且首先尝试100Mbps。