iptables in linux

T.C. Hollingsworth tchollingsworth at gmail.com
Sun Nov 13 01:20:18 UTC 2011


On Sat, Nov 12, 2011 at 5:52 PM, Roger <arelem at bigpond.com> wrote:
> On Sat, 2011-11-12 at 20:37 +0100, Heinz Diehl wrote:
>> On 12.11.2011, Roger wrote:
>>
>> > Is there a way to limit:
>> > -number of log in attempts to 2,
>> > -the duration of a log in attempt to 3 seconds or less
>> > -the number of times a username can be tried, prefer it set at 2 and
>> > then not again for 24 hours if it fails.
>> [....]
>>
>> Switch off login with password and root login, and only allow login
>> with RSA key. After that, you can safely ignore the "white noise" :-)
>>
>>
>  I read about this and am concerned that if my computer dies and I
> replace mb or other components, the RSA key could be different and I
> won't be able to log in with the previous RSA.
> Not understanding the process made me a bit nervous.

The "key" is just a file on your hard drive.  As long as you back it
up you'll be fine.

There's a good overview of how public key authentication works and how
to get it going here:
http://www.ibm.com/developerworks/library/l-keyc/index.html

-T.C.


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