Schlagwort-Archive: SSHd

Secure connections via Android and DD-WRT from everywhere in the world

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Introduction

You want to have a secure connection from your handset to the internet, even when surfing while using an unsecure wireless connection or an untrusted network? This can be done quite easily in case you meet the following preconditions:

  • Your handset is running Android 2.1 or higher
  • It is rooted
  • You own a router that is running an OpenSSH server (this article is using DD-WRT)
  • You have some dynamic IP service to connect to your home router (e. g. Dyn.com)

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Change port of SSH server

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Whenever you’re running your Linux own server on the internet, you will most probably require console access. The best idea is using SSH. This is usually on port 22. After leaving your server alone for a couple of days, you will notice that /var/log/messages fills up with incorrect logon attemps. This shouldn’t be an issue if you follow the rules:

  • do not allow root acces
  • use certificate authentication
  • alternatively use a very very strong password

But still, it’s annoying and clogs the log. Therefore I changed the port to something non standard. Even though this is not really securing the server agains dedicated hacking attemps but it will at least keep many automated scanners away and they will leave you alone.

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