# yum install nc# yum install telnet
telnet
# telnet 192.118.20.95 22Trying 192.118.20.95...Connected to 192.118.20.95.Escape character is '^]'.SSH-2.0-OpenSSH_6.6.1Protocol mismatch.Connection closed by foreign host. 如下是连通不成功的例子: # telnet 192.118.20.95 22Trying 192.118.20.95...telnet: connect to address 192.118.20.95: No route to host
nc -z -v
# nc -z -v 192.118.20.95 22Connection to 192.118.20.95 22 port [tcp/ssh] succeeded!
# nc -z -v 192.118.20.95 22nc: connect to 192.118.20.95 port 22 (tcp) failed: No route to host
nc -z -v -u
# nc -z -v -u 192.118.20.95 123Connection to 192.118.20.95 123 port [udp/ntp] succeeded!
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