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An SSH tunnel can provide a secure path over the Internet, through a firewall to a virtual machine. [9] The IANA has assigned TCP port 22, UDP port 22 and SCTP port 22 for this protocol. [10] IANA had listed the standard TCP port 22 for SSH servers as one of the well-known ports as early as 2001. [11]
A reverse connection is usually used to bypass firewall restrictions on open ports. [1] A firewall usually blocks incoming connections on closed ports, but does not block outgoing traffic . In a normal forward connection, a client connects to a server through the server's open port , but in the case of a reverse connection, the client opens the ...
HTTP tunneling is used to create a network link between two computers in conditions of restricted network connectivity including firewalls, NATs and ACLs, among other restrictions. The tunnel is created by an intermediary called a proxy server which is usually located in a DMZ .
ssh-keygen is a standard component of the Secure Shell (SSH) protocol suite found on Unix, Unix-like and Microsoft Windows computer systems used to establish secure shell sessions between remote computers over insecure networks, through the use of various cryptographic techniques. The ssh-keygen utility is used to generate, manage, and convert ...
Tunneling a TCP-encapsulating payload (such as PPP) over a TCP-based connection (such as SSH's port forwarding) is known as "TCP-over-TCP", and doing so can induce a dramatic loss in transmission performance due to the TCP meltdown problem, [26] [27] which is why virtual private network software may instead use for the tunnel connection a ...
Tunneling: Unlike most traditional, application based SSH clients, web-based SSH clients are unable to tunnel ("forward") TCP traffic. For example, running an X session over a web-based SSH session is not possible. However, the lack of ability is caused by implementation issues, and not inherent in some way.
An SSH client is a software program which uses the secure shell protocol to connect to a remote computer. This article compares a selection of notable clients. This article compares a selection of notable clients.
the Telnet, rlogin, and SSH client itself, which can also connect to a serial port PSCP an SCP client, i.e. command-line secure file copy. Can also use SFTP to perform transfers PSFTP an SFTP client, i.e. general file transfer sessions much like FTP PuTTYtel a Telnet-only client Plink a command-line interface to the PuTTY back ends.