Orhan Ergun No Comments

IPv6 Business Drivers and PI/PA Address Space

IPv6 Business drivers can be many and different businesses have different reasons to deploy IPv6 on their network.


IPv6 is more commonly deployed in the Service Providers than Enterprises or Small Medium Businesses. Do you know why ?


Main reason is IPv4 address space exhaustion. There is no available public IPv4 addresses in the RIR (Regional Internet Registries). Thus, when Service Providers want to allocate an IPv4 address to their customers, one of their options is to deploy IPv6.


There are many other reasons to deploy IPv6 in both Service Providers and the Enterprises and I explained many IPv6 business drivers in the below video, along with Provider Independent and the Provider Address Blocks.


Also, understanding Provider Independent (PI) and Provider Assigned (PA) address blocks is important because there are some design tradeoffs.


I explained these two topics, IPv6 Business Drivers and the PI/PA Address Blocks on my youtube channel in the below video.



Orhan Ergun 1 Comment

What is happy eyeballs ?

What is happy eyeballs ?


This term is very important to understand if you are deploying dual stack IPv6 network.


Before defining happy eyeballs, do you know what is an eyeball network ? Where is it used ? Where does ‘ happy eyeballs ‘ term come from ?  Read more

Orhan Ergun No Comments

IPv6 Transition Mechanisms | Dual-Stack -Tunneling – Translation

IPv6 Transition Mechanisms

The only available public IP addresses are IPv6 addresses. But vast majority of the content is still working on IPv4.

How IPv6 users can connect to the IPv4 world and How IPv4 users can reach to the IPv6 content ? This is accomplished with the IPv6 transition mechanisms.

In this post, I will explain the IPv6 transition mechanisms briefly, share some of my IPv6 real life design experiences and observations and will provide a road map for the future IPv6 design and deployment resources which I am going to cover on the website.

Read more

Orhan Ergun 2 Comments

Is IPV6 Dual-Stack really a best method for IPv6 design ?

There are mainly three IPv6 transition methods; Dual-Stack, Tunnelling and Translation. Careful engineers can understand the difference between IPv6 migration and IPv6 transition.

All of these three technologies are used to bring IPv6 protocol capabilities in addition to IPv4, they are not migration mechanisms. Migration means removing IPv4 completely and running only IPv6 only in the network which might not be the case at least for the next decade.
In this post, I will explain why IPv6 dual-stack unlike most people believe is not the best transition approach.

There is a saying, Dual-stack where you can, tunnel when you must, translate if you have a gun in your head.

ships follow each other

Read more

Orhan Ergun 2 Comments

IPv6 Design in the Enterprise

ipv6A month ago, I talked with Jeff Doyle about IPv6 Network design in the Enterprise.We strongly advised Enterprise companies to start considering IPv6 deployment.

Below were the subjects.Click here to listen.



  • Why IPv6 in the Enterprise, Real business drivers for the IPv6 in the Enterprise ?
  • Jeff Doyle’s advices to Service Providers
  • IPv6 Addressing Plan
  • IPv6 Design Alternatives for the Enterprises
  1. Starting from Core of the Network
  2. Starting from Edge of the Network
  3. Starting from the Internet Edge
  • Also Jeff Doyle announced that his new book about Software Defined Networking will be published soon. We are planning to talk his new books on the packetpushers podcast and you will be informed from orhanergun.net