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I was trying to avoid the reverse dns lookup by the ssh client. But I can not use the UseDNS option since it requires file modification to /etc/ssh/sshd_config which I'm not privileged to do.

Tried with -u0 ($ssh -u0 user@ -vvv) but the client complaints with ssh: illegal option -- u

Using Centos 6.2. Is there any way out?

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I don't think you can do this, it would not be very secure to let the client tell the server to do less verification on the client – parkydr Feb 5 '13 at 11:28
what happens if you just 'ssh user@ -vvv'? What exactly does not work? If nothing else helps you could make an entry in '/etc/hosts' for that IP. Or use the 'VerifyHostKeyDNS' Client-Option – sparkie Feb 5 '13 at 11:55

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