de-peering for security sake

Mike Hammett nanog at
Sat Dec 26 22:42:53 UTC 2015

Different network types will have different abilities to enforce this. 

Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

----- Original Message -----

From: "Jared Mauch" <jared at> 
To: "Joe Abley" <jabley at> 
Cc: nanog at 
Sent: Saturday, December 26, 2015 3:21:03 PM 
Subject: Re: de-peering for security sake 

> On Dec 26, 2015, at 11:14 AM, Joe Abley <jabley at> wrote: 
> With respect to ssh scans in particular -- disable all forms of 
> password authentication and insist upon public key authentication 
> instead. If the password scan log lines still upset you, stop logging 
> them. 

Or if you can’t get users to use keys (aside from remove the users) consider things like: 

example /etc/ssh/sshd_config 
Match User root 
PasswordAuthentication no 

for users that should not be permitted to fall-back to password authentication. 

- Jared 

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