Arun Stephens » dns http://blog.arunstephens.com Just another WordPress site Thu, 11 Aug 2011 20:55:37 +0000 en hourly 1 http://wordpress.org/?v=3.3 SSH slow to login? Disable reverse DNS lookup http://blog.arunstephens.com/2008/11/21/ssh-slow-to-login-disable-reverse-dns-lookup/ http://blog.arunstephens.com/2008/11/21/ssh-slow-to-login-disable-reverse-dns-lookup/#comments Fri, 21 Nov 2008 01:27:40 +0000 arun http://arunstephens.com/2008/11/21/ssh-slow-to-login-disable-reverse-dns-lookup Continue reading →]]> By default in Ubuntu (and probably other distributions), when you log into the SSH server, it will do a reverse DNS lookup of the client for security reasons.

That’s fine, but it’s kind of annoying when you don’t have a working reverse DNS for your IP address. Like for all my internal addresses.

To turn it off (thanks to http://ubuntuforums.org/showthread.php?t=577616):

Edit /etc/ssh/sshd_config and add the following line:

UseDNS no

Easy!

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