![]() ![]() The -L option specifies local port forwarding. Where should be replaced by the name of your laptop. You would use source port number 8080 (the alternate http port), destination port 80 (the http port), and destination server : You should already know your destination server, and for basic uses of port forwarding, you can usually use the port numbers in Wikipedia's list of TCP and UDP port numbers.įor example, say you wanted to connect from your laptop to using an SSH tunnel. To use local port forwarding, you need to know your destination server, and two port numbers. Local port forwarding lets you connect from your local computer to another server. Again, exactly how to do this depends on which SSH client you use, so you may need to consult your documentation. If you're using dynamic port forwarding, you need to configure your programs to use a SOCKS proxy server. If you're using local or remote forwarding, you need to tell your client the destination server. You also need to tell your client the source and destination port numbers to use. To use port forwarding, you need to make sure port forwarding is enabled in your server. For example, the PuTTY manual has a section on port forwarding in PuTTY. For help on using a specific client, consult the client's documentation. Port-forwarding is a widely supported technique and a feature found in all major SSH clients and servers, although not all clients do it the same way. Although this is very powerful, it takes a lot of work to set up, and it's usually easier to use local port forwarding for the specific sites you want to access. For example, dynamic port forwarding lets you bypass a company firewall that blocks web access altogether. For example, remote port forwarding lets you connect from your SSH server to a computer on your company's intranet.ĭynamic port forwarding is rarely used. For example, local port forwarding lets you bypass a company firewall that blocks Wikipedia. Local port forwarding is the most common type. Remote port forwarding: connections from the SSH server are forwarded via the SSH client, then to a destination serverĭynamic port forwarding: connections from various programs are forwarded via the SSH client, then via the SSH server, and finally to several destination servers ![]() Local port forwarding: connections from the SSH client are forwarded via the SSH server, then to a destination server There are three types of port forwarding with SSH: Even if you don't agree with that reason, your IT department might not take kindly to you flouting their rules. If the destination port provides a web service, you can open a browser tab and visit in this example, and you should see the service from the Destination server.Warning: Filtering and monitoring is usually implemented for a reason. Now, as long as you leave that SSH terminal window open, all traffic to the Source Port on your localhost will be forwarded on to the Destination. Then click “Open” to connect to your gateway. Then supply the destination address (the server that is available from your SSH gateway, but not from your local machine) as “Destination” as shown in the following image:Ĭlick “Add”, which will set the configuration as shown: Enter the port that you want to connect to locally under “Source port”. In the left-hand side nav tree, click Connection > SSH > Tunnels. Next, select it from the Saved Sessions list and click ‘Load’ as shown below: Step 1 – Load the Gatewayįirst, if you have not already done so, create and save the SSH gateway server as you would any other. So I decided to spell it out step-by-step, for people like me who need that extra little bit of help. There’s lots of articles on SSH tunneling, and plenty that cover how to create a tunnel with PuTTY, so why write another one? Because I spent longer than I should have trying to get this working the other day, and failing due to a simple order of operations issue. ![]()
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