You can simply drop or exit on User-agent, however as mentioned in above thread it is not a proper solution changing a user-agent is not a big deal, you may have to look into fail2ban, pike etc.

if ($ua =~ "friendly-scanner"){
      exit;
}



On Mon, Dec 30, 2013 at 2:18 PM, Moritz Graf <moritz.graf@g-fit.de> wrote:
Hi,

blocking staticly on the "friendly-scanner" string might not be the
smartest way. Not everyone is so "friendly" to include the
"friendly-scanner" string.
fail2ban seems reasonably, or take a look at that tutorial by daniel:
http://kb.asipto.com/kamailio:usage:k31-sip-scanning-attack (using htable)

greetz

Am 30.12.2013 09:33, schrieb Juha Heinanen:
> Visetel LLC writes:
>
>> I added the following rules on iptables, but it does not work.
>
> might be easier to use fail2ban and let it deal with iptables.
>
> -- juha
>
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