How can I suppress the "...this does not map back..." message when using SSH?

Question

I am writing a script that attaches to several of our machines via SSH to check some usage stats.

Each time I do:

ssh -i ~/.ssh/ourkeyfile.pem user@host

I get the typical message:

Address X.X.X.X maps to somedomain.com, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!

Is there a commandline switch for ssh that lets me suppress this message from appearing in the output of my script?

Danila Ladner · Accepted Answer · 2013-05-07 18:28:42Z

2

Well the script way is

2>&1 > /dev/null

The correct way is to fix ssh connection, host names.

Yeah, meaning need to fix known_hosts in .ssh folder.

answered May 7, 2013 at 18:28

Danila Ladner

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oh right, of course, thanks. actually 2>/dev/null is what i want, because i don't want to suppress normal output. and also this is not a hosts problem. its a reverse ns lookup issue, not solvable from my end.
– Octopus
May 7, 2013 at 18:39
It is good to be a network and admin guy in the organization, as I do not have to wait for some network dude to update records for 2 weeks.
– Danila Ladner
May 7, 2013 at 18:45

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Michael Hampton · Accepted Answer · 2013-05-07 18:39:23Z

0

Fix the reverse DNS entry (PTR record) and possibly the forward entry (A and AAAA records) for the host in question.

answered May 7, 2013 at 18:39

Michael Hampton

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Thanks for the suggestion, but its not wise to do that on Amazon EC2 instances.
– Octopus
May 7, 2013 at 18:55

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Octopus · Accepted Answer · 2013-05-07 18:50:40Z

0

Based on what Danila suggested:

To suppress only the warnings and errors you would do this...

2>/dev/null

answered May 7, 2013 at 18:41

Octopus

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3 Answers 3