The 20-port of 3750 is set as the upper-layer port interconnected with the external network, and the 20-port mode is set as the routing mode.
The setting command of routing mode is:
Switch (configuration) #int f0/20
Switch (configuration -if)# No switch port
The command to start routing is: switch(config)#ip routing.
Extended data:
Common ports and port numbers:
1.HTTP protocol proxy server common port number: 80/8080/3128/8081/9080.
2. Common port number of 2.SOCKS proxy protocol server: 1080.
3. Common port number of 3.FTP (file transfer) protocol proxy server: 2 1.
4.Telnet protocol proxy server universal port: 23
5, HTTP server, the default port number is 80/tcp (Trojan actuator opens this port);
6.https server, with the default port number of 443/TCP 443/UDP;
7.Telnet (insecure text transmission), the default port number is 23/TCP (the port opened by Tiny Telnet server);
8.FTP, the default port number is 2 1/tcp (ports opened by Trojans Dolly Trojan, Fore, Stealth FTP, WebEx, WinCrash and Blade Runner);
9.TFTP (Common File Transfer Protocol), the default port number is 69/UDP；; ;
10, SSH (secure login), SCP (file transfer), port redirection, the default port number is 22/TCP；; ;
1 1, SMTP simple mail transfer protocol (e-mail), and the default port number is 25/tcp (Trojan antigen, email password sender, Haebu Coceda, Shtrilitz Stealth, WinPC and WinSpy all open this port);
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