(To a large extent, pemu is influenced by dynamips. Pemu is mainly used to simulate CiscoPix firewall software. Of course, the same requirements as dyanmips have PIX IOS files. Many websites offer downloads of PIXios. Find it yourself if you need it. Pemu supports windowsXP and linux, and it will be more stable to use under linux. . . . . . . . 4: If you start multiple pixA: the vlan in the pemu command parameter cannot be repeated, and the udp port number cannot be repeated. Just do it. 5: How the routes of pix and dynamips are interconnected. Pix can now interconnect via udp and dynamips routers. Can use the command line of dynamips, and can also use the files of dynagen. Example using the command line: dynamips-P7200-tnpe-400-p0:C7200-IO-FE-s0:0:udp:9000:127.0.0.1:50007200.bin Here, the udp source of the Ethernet port f0/0 of the 7200 The port is 9000 and the intent port is 5000. Therefore, when starting the pix, the source port of a certain port of the pix must be 5000, and the intended port must be 9000.)