Apache mod status is showing ..reading

apache-2.2denial-of-service

Recently my apache got DoS attack, it happened attacker flood SYN request to our apache, i know because at that time i have wireshark enabled.

After the attack finished, i restart my apache and its all back to run normal. But the problem when i check my serverstatus from mod-status there are some threads are showing 

> 0-92 61968 0/0/674 R 1125 0 0.0 0.00 22.93 ? ? ..reading..
> 0-92 61968 0/0/29 R 537889 0 0.0 0.00 0.01 ? ? ..reading..
> 0-92 61968 0/0/852 R 1158 15 0.0 0.00 15.05 ? ? ..reading..
> 0-92 61968 0/0/2 R 537933 578 0.0 0.00 0.02 ? ? ..reading..
> 0-92 61968 0/0/3 R 537933 0 0.0 0.00 0.02 ? ? ..reading..
> 0-92 61968 0/0/1 R 538060 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/2 R 538060 0 0.0 0.00 0.01 ? ? ..reading..
> 0-92 61968 0/0/71 R 538146 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/31 R 538146 0 0.0 0.00 0.01 ? ? ..reading..
> 0-92 61968 0/0/0 R 1287665833 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/0 R 1287665833 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/0 R 1287665833 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/0 R 1287665833 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/0 R 1287665833 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/0 R 1287665833 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/0 R 1287665833 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/0 R 1287665833 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/0 R 1287665833 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/0 R 1287665833 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/0 R 1287665833 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/0 R 1287665833 0 0.0 0.00 0.00 ? ? ..reading..
> 0-92 61968 0/0/0 K 1287665833 0 0.0 0.00 0.00

these ..reading.. are always showing even after i restart. Do you have any idea how to remove this ? and where it comes from ?

Best Answer

To verify if you're still being attacked:

  1. Log on your server as root

  2. Type the following command

    netstat -plan | grep :80 | awk {'print $5′} | cut -d: -f 1 | sort | uniq -c | sort -n

    You will see a list of IP’s with the number of connections each once has to your server.

  3. If any IPs have more than 100 connections then there is a chance that this is your attacker. Go ahead and block this IP using APF if you have it installed or CSF.

    apf -d IP

    or

    csf -d IP
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