Alexander Arseniev writes:
>Someone is brute-forcing Your router password, and that is very common 
>nowadays. Good loopback filter would prevent this.

Amen to this and all your other points, esp re: avoiding telnet in
favor of ssh.

Also you can use "system services ssh no-passwords;" to prevent
password use under ssh, but this _requires_ that you have ssh keys
installed for every user under [system login user authentication].
You'll still get connections, which can be blocked using filters,
but you can sleep better at night knowing that brute force password
attacks will fail (after you delete telnet/ftp/etc).  Passwords
continue to function on the console and for non-ssh protocols.

Thanks,
 Phil
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