USING THE POWER OF TELNET COMMAND
Telnet is a network protocol used on the Internet or local area networks to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection. User data is interspersed in-band with Telnet control information in an 8-bit byte oriented data connection over the Transmission Control Protocol (TCP).
The Telnet commands allow you to communicate with a remote computer that is using the Telnet protocol. You can run Telnet without parameters in order to enter the Telnet context, indicated by the Telnet prompt (Microsoft Telnet>). From the Telnet prompt, use the Telnet commands to manage a computer running Telnet Client.
description
Telnet is a client-server protocol, based on a reliable connection-oriented transport.
Typically this protocol is used to establish a connection to Transmission Control Protocol (TCP) port number 23, where a Telnet server application (telnetd) is listening.
To know more on the List of TCP and UDP port numbers [Official, Unofficial, Multiple use] : http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
INTERNET PROTOCOLS
Application layer:
DHCP DHCPv6 DNS FTP HTTP IMAP IRC LDAP MGCP NNTP BGP NTP POP RPC RTP RTSP RIP SIP SMTP SNMP SOCKS SSH Telnet TLS/SSL XMPP (more: http://en.wikipedia.org/wiki/Category:Application_layer_protocols)
Transport layer:
TCP UDP DCCP SCTP RSVP (more: http://en.wikipedia.org/wiki/Category:Transport_layer_protocols)
Internet layer:
IP IPv4 IPv6 ICMP ICMPv6 ECN IGMP IPsec (more: http://en.wikipedia.org/wiki/Category:Internet_layer_protocols)
Link layer:
ARP/InARP NDP OSPF Tunnels L2TP PPP Media access control Ethernet DSL ISDN FDDI (more: http://en.wikipedia.org/wiki/Category:Link_protocols)
HOW TO CLOSE AN ACTIVE TELNET CONNECTION?
Linux:
After programme has completed its execution and returned a response, you can hit enter twice to close the connection.
In case the response is taking longer, the terminal will show a “C:ANSI>” (character) to close connection.
To close the telnet connection, “CTRL” + ” ] ” or “CTRL” + ” ^] ” have to be pressed.
Note: One should never use “CTRL” + “C”.
Windows:
in windows its a little tricky but not hard, to end your current telnet connection
Point the cursor on telnet prompt and type quit.
Following are the steps to quit (Prompt: Microsoft Telnet>):
1. Open the telnet prompt by holding down the “Ctrl” key and push the ‘]’ key.
2. Type “quit”.
3. Push the “Enter” key.
EXAMPLE
Linux:
$> telnet <host_domain_name> Trying <host_domain_name>... Connected to <host_domain_name> (<host_domain_IP_address>). Escape character is '^]'. GET /index.php?id=12323&action=news HTTP/1.1 Host: <host_domain_name> Cookie: <cookie_info> Connection: close O/P HTTP/1.1 200 OK Date: Sun, 20 Jan 2010 09:10:42 GMT Server: Apache Vary: Accept-Encoding Content-Length: 7 Connection: close Content-Type: text/html Success
Note: always add connection close explicitly or else the multiple connections will be left open and unused
AustinSmash 