SSH Tunnel

Tunneling or tunneling is a very useful technique to bypass restrictions and create an encrypted channel for data traffic.

SOCKS

ssh -ND 8888 julio@host

Parameters:

• -N: do not execute commands
• -D: run a proxy server on the specified port
• -f: run in the background
• -C: enable compression

Firefox

Edit » Preferences » Advanced » Settings… » Manual proxy configuration:

• SOCKS Host: localhost
• Port: 8888

Chromium

$ chromium --proxy-server="socks5://localhost:8888" \
            --proxy-bypass-list="192.168.15.10;127.0.0.1:8080;*.google.com" \
            --host-resolver-rules="MAP * ~NOTFOUND , EXCLUDE localhost"

Jump Server

Let’s say there is a database (PostgreSQL on port 5432) that is only accessible from the local network. If you have SSH access to a machine on that network, you can interact with the database as follows:

ssh -N -L 127.0.0.1:5434:$DB_HOST:5432 my_server

pg_dump --verbose --create --schema-only --no-owner -d nome_bd -h localhost -p 5434 -U usuario --password -f dump.sql