1. If you can not log on to a remote device, it may be because there is no password set on the remote device. It may be due to the access control list filtering the remote login session.
show users: check which devices are connected to this router.
clear line #: # Clear connection
2. Establish a host table: host table only provide name resolution for the establishment of a router host table. Command to establish the host table on the router as follows:
ip host host_name tcp_port_number ip_address
The default TCP port number is 23. But it can create a session with a different TCP port number through Te1net, if needed, you can also assign a host name up to eight IP addresses.
show hosts command provides temporary DNS entry information, and use the ip host command to create a permanent name to address mapping information.
3. If there is a DNS server on your network, you need to add some commands normal operation of the DNS name resolution:
Router console uses DNS to resolve the name:
Corp(config)#ip domain-lookup
Corp(config)#ip name-server 192.168.0.70
/ Set the IP address of the DNS server. You can enter up to six server's IP address.
Corp(config)#ip domain-name lammle.com
4.If you save a configuration and reload the router and it comes up either in setup mode or as a blank configuration, chances are you have the configuration register setting incorrect.
5.To see console messages through your Telnet session, you must enter the terminal monitor command.