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public:ssh [2009/04/07 10:57] – created Nicopublic:ssh [2023/06/21 22:30] (current) – fix code tag bug Nico
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 once connected to server_to_connect_to, localhost:8080 would be the same as server_to_forward_ports_of:80. once connected to server_to_connect_to, localhost:8080 would be the same as server_to_forward_ports_of:80.
 +
 +====== SOCKS proxies ======
 +
 +<code>
 +ssh -D 8080 server_to_connect_to
 +</code>
 +
 +once connected to server_to_connect_to, use localhost:8080 as the (SOCKS v4) proxy server in your favorite browser.
 +
 +====== Using a local proxy to enable internet access on a remote host ======
 +
 +  * install some proxy software (i.e., Squid) 
 +  * connect to the server, and map a port to the proxy's one:
 +
 +
 +<code>
 +ssh -R8181:localhost:3128 server_to_connect_to
 +</code>
 +  * once connected, enter:
 +
 +<code>
 +export http_proxy=http://127.0.0.1:8181
 +</code>
 +  * surf
 +
 +====== Run a command on login ======
 +
 +Commands in /etc/ssh/sshrc are executed by ssh when the user logs in, just before the user's shell (or command) is started. It's commonly used to send alerts using mail:
 +
 +<code>
 +#!/bin/sh
 +# source: http://blog.uggy.org/post/2009/06/05/Execution-de-commande-lors-d-une-connexion-SSH
 +DATE=`date "+%d.%m.%Y--%Hh%Mm"`
 +IP=`echo $SSH_CONNECTION | awk '{print $1}'`
 +REVERSE=`dig -x $IP +short`
 +HOSTNAME=`hostname`
 +
 +echo "Connexion de $USER sur $HOSTNAME
 +IP: $IP
 +ReverseDNS: $REVERSE
 +Date: $DATE
 +
 +" | mail -s "Connexion de $USER sur $HOSTNAME" me@mail.com
 +</code>
 +
 +====== Multiplexing ======
 +
 +If you make several connections to the same server, you can speed up every connection after the first one by enabling multiplexing.
 +
 +  * create the directory where connections' data will be stored:
 +
 +<code>
 +$ mkdir -p ~/.ssh/connections
 +$ chmod 700 ~/.ssh/connections
 +</code>
 +
 +  * Enable multiplexing for every hosts in .ssh/config:
 +
 +<code>
 +Host *
 +ControlMaster auto
 +ControlPath ~/.ssh/connections/%r_%h_%p
 +</code>
 +
 +Warning: This will not work with tunneled protocols or forwarded ports (See [[http://www.symkat.com/ssh-tips-and-tricks-you-need]]).