A Secure Shell (SSH) client is software that uses the SSH cryptographic protocol to enable users to connect to other computers, primarily to transfer files and for terminal access.
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It facilitates secure connections allowing clients to enter both remote commands and to perform other network services.
However, not all SSH clients are alike. What we’re highlighting below are five of the top SSH clients for Windows and MAC.
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PuTTY – The Most Popular
PuTTY isn’t only an SSH client, it’s a telnet client that was originally developed for Windows, but it has been ported to other operating systems, including Mac OS, Windows Mobile and Phone. It supports a wide assortment of network protocols, including rlogin, SSH, Secure Copy Program (SCP) and Telnet.
PuTTY offers users control for encryption keys and protocol versions, can emulate control sequences for terminal emulation and can facilitate local, remote or dynamic port forwarding. It also supports IPv6, which is a plus going forward.
It’s bundled with PSCP and PSFTP, which are command line SCP and SFTP clients. Other components include PuTTYtel (a Telnet only client), Plink, Pageant and PuTTYgen.
Private Shell can be used on all versions of Windows, including 95/98/ME/NT/2000/XP/2003/7 and 8, both in 32 and 64 bit systems. It has a diverse set of features including terminal and email server connection, SOCKS5 proxy, database connection (DB, MySQL, Oracle) and more.
Like PuTTY, it’s extremely user friendly because of its Graphic User Interface (GUI) and ease of use. It is however only available for Windows operating systems.
It has a built in SFTP client and enables secure terminal connections, CVS/SVN repository access, VNC server connection and X11 tunneling.
Its auto configuration wizard helps clients to set up both basic and advanced SSH sessions, easily establishing connections using public key authentication.
Shuttle – for MAC
Shuttle facilitates quick, simple MAC shortcuts to all the SSH servers while remaining on the menu bar. Clients can save their settings in DropBox. Its default configuration is workable, but it can be customized.
Free download program mastering c venugopal pdf viewer. For example, by default Shuttle parses your ~/.ssh/config file for hosts. Config and specific host entries can be disabled, including those that contain a keyword.
MobaXterm is an advanced terminal for Windows, making it a viable alternative to PuTTY. It provides a myriad of functions that are ideal for webmasters, programmers and IT administrators alike. It comes with an X11 server, lots of networking tools and tabbed SSH.
What does MobaXterm include? It contains the most important remote network tools, including VNC, FTP, MOSH, SSH, X11 and RDP. It’s an all-in-one network application for remote operations which display seamlessly on Windows desktops by utilizing its embedded X server.
Its Home Edition is free, but if you’re looking to utilize it in a corporate environment, the professional version is well worth the purchase.
ZOC is an outstanding SSH/telnet client for Mac OS and Windows, featuring a myriad of emulations and accessibility to hosts and mainframes via secure shell, telnet and serial cable.
What makes ZOC popular are its tabbed sessions with thumbnails, its scripting language with over two hundreds commands, the fact that it’s administrator friendly and customizable, plus it’s compatible with Windows 8 and OS X Yosemite. ZOC features scrollback, full keyboard remapping and extensive logging.
Add user defined buttons, macro recorder and automatic actions, and for file transfers, SCP, Zmodem, Xmodem, Ymodem and Kermit.
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What is Telnet?In client/server computing, you need to be able to send data to and receive data from a host. To do this, a general terminal or a terminal emulator is normally used. Naturally, the terminal or the PC that is running a terminal emulator must be connected to the server or mainframe computer.
There are various different methods that can be used to connect the terminal to the server. Among these methods are serial cables, modems and existing local area and wide area networks.
For a long time, the most common network-based connection method was Telnet, a standard protocol for making text-based connections between two different computers.
Nevertheless, Telnet has one major drawback: all data is exchanged without any form of encryption.
In a small corporate environment where LAN cables and infrastructure are controlled by the owners, today Telnet may well be barely sufficient. However, it can present a serious security risk when you are transmitting over a wide area or using public lines.
When using Telnet, anybody with network knowledge and tools can monitor the data exchange, even gaining access to details like usernames and passwords. For this reason, nowadays SSH (Secure Shell) is usually a better alternative.
Telnet Technical ReferenceThe technical specifics for telnet that a telnet-client needs to adhere to are defined in RFC-854.
Its abstract describes Telnet like this:
A TELNET connection is a Transmission Control Protocol (TCP) connection used to transmit data with interspersed TELNET control information. The TELNET Protocol is built upon three main ideas: first, the concept of a 'Network Virtual Terminal'; second, the principle of negotiated options; and third, a symmetric view of terminals and processes.In other words, telnet defines a way for two computers (telnet-client and telnet-server) to make a text based communication (usually typed commands and text reply) over a network (TCP), but allowes to mix internal telnet-client specific controls into the data that the user sees.
Telnet Technical Implementation BasicsTelnet communication between client and server is established using the TCP/IP protocols and communication is based on a set of facilities known as a Network Virtual Terminal (NVT).
Essentially the telnet protocol is the network version of the earliest terminals which where connected to the host using serial cables. So in a way telnet treats the network connection between client and server as if it were a long serial connection.
Data is mostly considered to be printable ASCII text to be transmitted to and interpreted by the other side. Data which the server sends, is dispayed on the client screen. Characters typed on the client are sent to the server.
The client, usually playing the role of a terminal emulator may interpret some incoming characters a screen control codes (e.g. to place the cursor or change text color). In a way, a telnet client is a screen and keyboard hooked up to the server by a very very long cable (i.e. the network).
Interpret-as-Command (IAC)The telnet transmission is not fully transparent however. Telnet reserves the use of one character with code hex FF for its own use and uses that to insert control data into the user's data stream. This data is not intended to be displayed to the user, but instead its purpose is to manage the connection. The xFF character is called IAC or Interpret as Command.
The client and server use this character to manage the connection or transmit data that is not intended for the user, e.g. the telnet client can use it to tell the server about changes in screen size, or that it intends to transmit binary data.
All Telnet commands consist of at least a two byte sequence: the 'Interpret as Command' (IAC) escape character followed by the code for the command. The commands dealing with option negotiation are three byte sequences, the third byte being the code for the option referenced. This format was chosen so that as more comprehensive use of the 'data space' is made, collisions of data bytes with reserved command values will be minimized. With the chosen set-up, only the IAC need be doubled to be sent as data, and the other 255 codes may be passed transparently.
Some of the telnet commands (2nd byte in the data stream after IAC) are:
Telnet Client equals Terminal EmulatorAs outlined above, telnet is a connection method that allows character based terminals to communicate to a remote server in text-based command oriented terminal sessions. Think of it as a way to type commands and see results in a shell Window (e.g. in the black DOS/Command Prompt Window on a Windows computer or the terminal window on a Linux computer), but a shell Window that is not running commands on the local but on a remote computer.
A telnet-client is a computer that the user interacts with, while the telnet-server processes the commands. The telnet-client is usually a terminal emulator, i.e. a software that allows a remote computer to receive keyboard input from, and send formatted text to the user's computer.
ZOC is the telnet client that can handle all the basic terminal functions as well as a wealth of additional, useful features. This telnet client takes advantage of the computing power of a PC to allow you to automate tasks (such as logging on or retrieving data automatically), log sessions on screen or file (for documentation or later review), copy data between a text processor and the remote server, and much more.
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