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Re: Blocking SSH ... BUT...



have higher up rules that allow you to do it :)

On Tue, Sep 18, 2007 at 11:53:24AM -0600, Ashley M. Kirchner (ashley pcraft com) wrote:
> 
>    Hey all,
> 
>    I have the following lines in my iptables config file to curb ssh 
> knocking on our servers:
> 
> # Let's see if we can curb SSH attacks.
> -A INPUT -p tcp --syn --dport 22 -m recent --name sshattack --set
> 
> -A INPUT -p tcp --syn --dport 22 -m recent --name sshattack --rcheck 
> --seconds 120 --hitcount 2 -j LOG  -log-prefix "SSH REJECT: "
> 
> -A INPUT -p tcp --syn --dport 22 -m recent --name sshattack --rcheck 
> --seconds 120 --hitcount 2 -j REJECT --reject-with tcp-reset
> 
> 
>    This works great...EXCEPT it also blocks our own access to the 
> servers if we need to get on them in a short amount of time (less than 
> 120 seconds).  So how can I still implement the above blocking, but 
> allow anything from our different subnets (we have 4) come through 
> without going through that block routine?
> 
> -- 
> W | It's not a bug - it's an undocumented feature.
>  +--------------------------------------------------------------------
>  Ashley M. Kirchner <mailto:ashley pcraft com>   .   303.442.6410 x130
>  IT Director / SysAdmin / Websmith             .     800.441.3873 x130
>  Photo Craft Imaging                       .     3550 Arapahoe Ave. #6
>  http://www.pcraft.com ..... .  .    .       Boulder, CO 80303, U.S.A. 
> 
> -- 
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