设备A 对公网提供Telnet 服务,即公网访问私网,配置nat sever[H3C-Serial0/2/0]nat server protocol ?<1-255> Protocol number of the servericmp Internet Control Message Protocol (1)tcp Transmission Control Protocol (6)udp User Datagram Protocol (17)[H3C-Serial0/2/0]nat server protocol tcp global 2.2.2.1 ?<0-65535> Port number of the serverCHARgen Character generator (19)any Any protocol (0)bgp Border Gateway Protocol (179)cmd Remote commands (rcmd, 514)….