Question

Help make sense of what I see in iftop

My site went down today, I’m pretty sure it was a DOS attack but what’s weird is that it came back up on its own four hours later. When I look at the CPU usage on my droplet it ran at 700+% for hours then back to normal.

When I got to a terminal the site was back to normal and CPU usage back to normal as well. I ran IFTOP to check for network traffic and here’s what I’m seeing:

mqqqqqqqqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqqqqqqqq 10.20.0.6 => 82.193.127.15.cl.ipnet.ua 2.05kb 27.2kb 23.8kb <= 160b 1.72kb 1.88kb loadtest.b1000test53 => 24.114.75.207 1.41kb 1.51kb 1.56kb <= 160b 160b 160b loadtest.b1000test53 => google-public-dns-a.google.com 876b 175b 252b <= 876b 175b 384b loadtest.b1000test53 => google-public-dns-b.google.com 876b 175b 44b <= 584b 117b 29b 10.20.0.6 => 155.133.82.141 208b 42b 10b <= 368b 74b 18b loadtest.b1000test53 => sellingeverywhere.com 0b 0b 127b <= 0b 0b 81b 10.20.0.6 => 10.20.0.2 0b 0b 81b <= 0b 0b 127b loadtest.b1000test53 => 162-144-140-49.unifiedlayer.com 0b 0b 0b <= 0b 0b 9b

What is the loadtest? Some sort of an attack I’m assuming. How do I stop it?

Submit an answer

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

Sign In or Sign Up to Answer

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Want to learn more? Join the DigitalOcean Community!

Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in Q&A, subscribe to topics of interest, and get courses and tools that will help you grow as a developer and scale your project or business.

Adam Robertson • August 21, 2016

Pretty much all of my Wordpress sites have to be locked down or I deal with constant barrages of different types of attacks. Generally the attacks crash Mysql rather than Apache.

Here are the steps I take. Others might have alternative advice:

Use the Wordpress plugin called LoginLockdown -this prevents multiple incorrect logins from the same IP address…it can be annoying if you forget your password or your caps-lock is on and you try to login and then get locked out, but it is worth the extra security.

Change the Wordpress Login URL. There are several ways to do that, just Google a few. It takes about half and hour, but is worth the time. Here is one approach: https://managewp.com/change-your-wordpress-login-url.

Add PerishablePress 6G Firewall to your .htaccess: https://perishablepress.com/6g/

Also, add these lines to your .htaccess:



    #prevents access to wp-config
    <Files wp-config.php>
    order allow,deny
    deny from all
    </Files>




#prevents directory browsing
    Options All -Indexes

       # Protect the .htaccess
    <files .htaccess="">
    order allow,deny
    deny from all
    </files>


# protect xmlrpc
<Files xmlrpc.php>
	Order Deny,Allow
	Deny from all
	##if you need to allow someone access for pingbacks
	##Allow from 123.456.789 ##yourserver
	##Allow from 321.654.987 ##yourotherserver
</Files>

Try those things, reboot your server and see if that does not dramatically reduce attacks on your site.

Adam Robertson • August 21, 2016

Are you running a Wordpress site?

Try DigitalOcean for free

Click below to sign up and get $200 of credit to try our products over 60 days!

Sign up