How DHCP and DNS are managed in Amazon VPC

In our day-to-day lives, we take a lot of things for granted. Our body, our friends, water, the food we eat, clothes we wear, IP address of our host, FQDN of our favorite websites, etc. In our ignorance, we forget to consider how our lives would be without them. Let’s discuss the leisure of friends, food, etc sometime later. For now, we’ll limit our thoughts to how DHCP and DNS are managed in AWS, both of which are the backbone to connections among hosts and servers over a network.

Continue reading “How DHCP and DNS are managed in Amazon VPC”

That’s Why Iptable Is Not A Good Fit For Domain Name?

Context

Let’s first talk about how it all started with and what we achieved.

It’s all started with a healthy discussion with a team where our team members were discussing many aspects of different fields of technology. So, one of our colleagues mentioned OpenVPN. So, we discussed the different working field, architecture, workflow of OpenVPN, in which role of iptables comes into the picture because for Linux architecture, OpenVPN support iptables as it’s primary firewall utility or can say OpenVPN support iptables as it’s a firewall for filtering workflow.

So in-between discussion, I mentioned that I am using iptables in OpenVPN to block traffic for the domain name and it is working fine. So, my colleague asked me about how you implemented & how is it possible to use iptables for domain and they discussed multiple logical explanations like OSI layer support and many other things. So, we decided to do POC of this discussion and try to write-up some blog or points to make clear that is it possible use iptables for the domain name and if not, what are the area that we can cover with iptables for the domain name and try to cover up flaws of this. Continue reading “That’s Why Iptable Is Not A Good Fit For Domain Name?”