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I have a server, that I work with via SSH. It took quite a lot time (a few seconds) to request the password before I've added it to my /etc/hosts file, but after I've done that there is no pause between SSH command and password request. I'm curious, why?

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up vote 3 down vote accepted

DNS lookup is what is taking time.

Adding

UseDNS no

To your /etc/ssh/sshd_config will achieve the same thing

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Probably - another likely candidate is an ident lookup. Both would be evident from monitoring the outgoing traffic on the server. – symcbean Mar 20 '13 at 12:39

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