主机发现和nmap扫描nmap-sn192.68.56.0/24靶机ip：192.168.56.105nmap-sT--min-rate10000192.168.56.105PORTSTATESERVICE22/tcpopenssh3128/tcpopensquid-http8080/tcpclosedhttp-proxynmap-sT-sV-sC-O-p22,3128,8080192.168.56.105PO