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utilizing unused ips as a means to block scripted or physical hacking attempts

Discussion in 'Security' started by rockscarfone, Dec 29, 2013.

  1. rockscarfone

    rockscarfone Member

    Aug 30, 2006
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    ok, i have 20 ips delegated to a server

    only 5 ips are utilized by server

    the remaining are just sitting there

    those attempting attacks will go through the list

    they hit the first ips then go through the list

    modsec is not blocking subsequent attempts at ip attacks until they are attempted

    thus, 000.001 is hit and denied

    then 000.002 is hit and denied

    by same incoming ip

    below are 3 of 14 attempts by one ip as shown in modsec

    so, the ip is going down ip list. x hundreds

    i want to tie each unused ip or all unused ip's to a web page or program that immediately blocks the ip.

    though i could remove the ips i see them as a way to "*midway" these attackers

    having a means to stop on first ip would completely block attacker to any access for a period of time

    especially the scripted Asian attacks

    any comments pro or con appreciated.

    i have most security packages installed so if i am missing the facts of using them to do this will also be appreciated


    - - - Updated - - -

    what i would like to do is similar to this how to except i need it automated.

    Nullroute IP using route command

    Suppose that bad IP is, type following command at shell:

    # route add gw lo

    You can verify it with following command:
    # netstat -nr
    # route -n
    You can also use reject target (thanks to Gabriele):
    # route add -host IP-ADDRESS reject
    # route add -host reject

    To confirm the null routing status, use ip command as follows:
    # ip route get

    RTNETLINK answers: Network is unreachable

    Drop entire subnet
    # route add -net gw lo
  2. cPanelMichael

    cPanelMichael Forums Analyst
    Staff Member

    Apr 11, 2011
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    Root Administrator
    Hello :)

    I recommend utilizing a third-party firewall to block the offending IP address, as opposed to additional Mod_Security rules. CSF is a common firewall used by cPanel users, and you can implement custom iptables rules if necessary.

    Thank you.

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