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RouterConfig
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Connect Laptop to Router Console Port
You must have 1 or both of these cables to complete this task:
Serial DB-9/Ethernet RJ-45 console cableConsole Cable
USB to serial DB-9 adapter only if your laptop does not have a serial port
usb-serial-adapter
To connect your laptop to the console port on your router:
1. configure terminal
2. interface gigabitethernet slot/port
3. ip address ip-address mask
4. no shutdown
5. exit
ARP (Address Resolution Protocol) – used to associate an IP address with a MAC address.
IP (Internet Protocol) – used to deliver packets from the source host to the destination host based on the IP addresses.
ICMP (Internet Control Message Protocol) – used to detects and reports network error conditions. Used in ping.
TCP (Transmission Control Protocol) – a connection-oriented protocol that enables reliable data transfer between two computers.
UDP (User Datagram Protocol) – a connectionless protocol for data transfer. Since a session is not created before the data transfer, there is no guarantee of data delivery.
FTP (File Transfer Protocol) – used for file transfers from one host to another.
Telnet (Telecommunications Network) – used to connect and issue commands on a remote computer.
DNS (Domain Name System) – used for host names to the IP address resolution.
HTTP (Hypertext Transfer Protocol) – used to transfer files (text, graphic images, sound, video, and other multimedia files) on the World Wide Web.
IP address with subnet mask decimal notation
view current configuration (RAM) Router # show running-config or write
terminal
view saved (startup) configuration Router # show config or show startup-
config
view basic files system (flash) Router # show flash (or dir)
view router utilization Router # show processes
disable CDP for entire router Router (config) # no cdp run
disable CDP on an interface Router (config-int) # no cdp enable
show interfaces and ip addressing Router > show ip interface brief
show routing table Router > show ip route
show routing protocols for ip Router # show ip protocol
show ip arp table Router # show ip arp
Given that ssh works but telnet doesn't, there are a few options:
A firewall is blocking the traffic on the server
Telnet is not running on the server
Your connections are routed through a gateway that filters out telnet traffic
You typed different ip addresses when you tried to connect via ssh / telnet
Packet Tracer practice. Record ALL commands and practice in a virtual environment
Router> <– User EXEC Mode
Router# <– Privileged EXEC mode
Router(config)# <– Global Configuration Mode
Router(config-if)# <– Interface Configuration Mode
Router(config-line)# <– Line Configuration Mode
enable
configure terminal
ip address 0.0.0.0 0.0.0.0 [default device/modem]