指定网卡tcpdump -i lo指定IPtcpdump host 192.168.1.101指定通讯双方IPtcpdump host 192.168.1.101 and \(192.168.1.102 or 192.168.1.103\)排除IPtcpdump host 192.168.1.102 and not 192.168.1.103来源IPtcpdump src host 192.168.1.102目标IPtcpdump dst host 192.168.1.102指定端口tcpdump port 80TCP数据tcpdump tcpUDP数据tcpdump udp打印数据包内容tcpdump -A写入文件tcpdump -w data.pcap读取文件tcpdump -r data.pcap显示IP不显示域名tcpdump -nGUI工具CocoaPacketAnalyzerSmartSniffWireshark
监听nc -l 8888nc -k -l 8888 # 持续监听连接nc 127.0.0.1 8888检查端口nc -v -w 5 127.0.0.1 8888端口扫描nc -v -w 2 -z 127.0.0.1 20-80 # -w 超时时间 -z 发送0值nc -u -v -w 2 -z 127.0.0.1 20-80 # udp文件传输nc -l 8888 > data.gznc 127.0.0.1 8888 msg; echo Response “:” world; doneecho hello | nc 127.0.0.1 8888广播/订阅# 广播 用golang 或 nodejs实现比较好nc 127.0.0.1 8888 | while read line ; do echo $line; done # 订阅cat list.txt | while read host port ; do echo close | nc $host $port; done # 广播nc -k -l 8888 | while read line ; do echo $line; done # 订阅复杂远程调用cat << EOF | nc 127.0.0.1 80GET / HTTP/1.1Host: 127.0.0.1EOF
