CSRF, also known as Cross-Site Request Forgery is a trick which is commonly targeted to web forms. This is often used by (spam)bots but also by individuals who might try to break into your application.
At these times your visitors have all kinds of different screen resolutions and also resize their browser window. Resolutions vary between 1280×1024, 1680×1050, 1920×1200, 2560×1440 and all make a huge difference. And then there’s the difference between people who have their browser window maximized, while others resize it so they can fit other windows on the screen as well. There’s a relatively easy way to make it fit the window properly.
This guide will demonstrate how to deploy DKIM on Debian-based Linux distributions. Other distributions work similar, except some do not use the scripts in init.d. The configuration of DKIM will be the same. I will discuss HOW to deploy it, not WHY to deploy it as I assume you’ve already decided to do so.
Imagine that your company’s network owns the IPv4 range 18.104.22.168 – 22.214.171.124. The Reverse Lookup zone would be 60.50.40.in-addr.arpa, covering this entire network. Your primary nameserver is ns.acme.com. Your zone would look something like this:
60.50.40.in-addr.arpa ns.acme.com. support.acme.com. (
@ IN NS ns.acme.com.
1 IN PTR www.acme.com.
But now you want to delegate the range 126.96.36.199 – 188.8.131.52 to the nameserver coyote.acme.com. Since it also resides in the same reverse zone, you cannot delegate this entire zone, as this would just move your entire network to the control of coyote.acme com, something you might not want to achieve with delegation.