InternetInternet24ADSLInternet11SnifferIPTCP23PING2,70%Windows98/200034®18313200002021-6355396863114913021-63261194@dawsonchina.com®12StopHacker®*NATIPNATPAT**3OTPOne-TimePasswordReplayAttackStopHacker®ICikey4StopHacker®IPIC5MACIPIP?MACIPMACIP18313200002021-6355396863114913021-63261194@dawsonchina.com6StopHacker®®1IPIP(TCP)*IP**TCP/UDP*ICMP*TCP*SYN*SYN/ACK**FINStopHacker?23IPNATStopHacker?IPIPIPWebFTPIPIPIPIPIPIPIP4TCP/IP5HTTPFTP6*HTTPFTP18313200002021-6355396863114913021-63261194@dawsonchina.com*ICikey7IP89Windows101112URL13*TCPUDP*DOS/DDOS*IPDNS/RIP/ICMPSYN*ActiveXJavaJavascript1415VPN1618313200002021-6355396863114913021-63261194@dawsonchina.com®18313200002021-6355396863114913021-63261194@dawsonchina.com