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ssh-port-forwarding
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Florian Schlegel 2022-04-14 20:06:10 +02:00
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README.md
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There are many good reasons to do secure port forwarding through ssh. For example if you own two servers in different datacenters and you want to connect them to a single service which is less restricted when accessed locally (e.g. port 25 for SMTP) or you want to forward a service from a system behind a firewall (e.g. a web service on your home server).
Traditionally you would use autossh to manage permanent ssh connections. However through many hours of testing this has prooven unreliable in many ways. When connecting multiple times to the same server autossh by default uses the same ports for monitoring, which leads to the termination of at least one connection. There also were inexplicable cases when sshd remained running on the server, while the client was actually disconnected and could not restore the connection due to the broken process on the server.
Luckily opennsh made autossh redundant because it already offers built-in monitoring. No additional monitoring ports are necessary anymore. However, there are quite a few options that you should know about in order to improve security and reliability of such a setup. This is the motivation behind this tutorial.
Luckily openssh made autossh redundant because it already offers built-in monitoring. No additional monitoring ports are necessary anymore. However, there are quite a few options that you should know about in order to improve security and reliability of such a setup. This is the motivation behind this tutorial.
## Disclaimer