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Anonymous Access: As SSH access is tunneled through an intermediary web application server it is this server which actually communicates with the SSH server. This means that the SSH server will only be aware of the IP address of the web application server, keeping the actual client's IP address hidden.
The Secure Shell Protocol (SSH Protocol) ... The transport layer (RFC 4253) typically uses the Transmission Control Protocol (TCP) of TCP/IP, ...
It is possible, however, to run it over SSH-1 (and some implementations support this) or other data streams. Running an SFTP server over SSH-1 is not platform-independent as SSH-1 does not support the concept of subsystems. An SFTP client willing to connect to an SSH-1 server needs to know the path to the SFTP server binary on the server side.
ssh-add and ssh-agent, utilities to ease authentication by holding keys ready and avoid the need to enter passphrases every time they are used. ssh-keygen, a tool to inspect and generate the RSA, DSA and elliptic-curve keys that are used for user and host authentication. ssh-keyscan, which scans a list of hosts and collects their public keys.
In computer networks, a tunneling protocol is a communication protocol which allows for the movement of data from one network to another. They can, for example, allow private network communications to be sent across a public network (such as the Internet), or for one network protocol to be carried over an incompatible network, through a process called encapsulation.
The SSH server is configured to redirect data from a specified port (which is local to the host that runs the SSH client) through a secure tunnel to some specified destination host and port. The local port is on the same computer as the SSH client, and this port is the "forwarded port".
The Secure Shell (SSH) Protocol Architecture: January 2006: SSH-2: RFC 4291 : IP Version 6 Addressing Architecture: February 2006: IPv6: RFC 4353 : A Framework for Conferencing with the Session Initiation Protocol (SIP) February 2006: Conference call: RFC 4408 : Sender Policy Framework (SPF) for Authorizing Use of Domains in E-Mail, Version 1 ...
There are honest uses for using reverse connections, for example to allow hosts behind a NAT firewall to be administered remotely. These hosts do not normally have public IP addresses, and so must either have ports forwarded at the firewall, or open reverse connections to a central administration server.
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