IPv6 Odyssey

What is Dual Stack Dual stack simply means configuring an IPv4 address and an IPv6 address on the same interface of a particular device (Router,L3 switch). This means you do not need separate physical or virtual interfaces to configure both an IPv4 and IPv6 address. In fact you do not need a separate VLAN for an IPv6 address, it will be configured within the same VLAN as the IPv4 address. This is probably the best option for an enterprise that already has a IPv4 environment and now want to embark on IPv6 infrastructure. Which is exactly what I have done for my IPv6 deployment for an Enterprise Virtual Data Center. To configure IPv6 you simply enter the correct commands, starting with IPv6 unicast routing........ The diagram below provide a bit more of a clear understanding on the subject.

IPv6 - What do you do with all those 000000...... Coming from a IPv4 background and training, when you first look at a IPv6 address, it seems quite scary. When you couple that IPv6 address with a horrendous amount of zero's, it becomes very scary. The full length address format looks like this: 200B:AA00: 0 200: 0000:0000:0000:0000:0000:0000 /48 The 200B:AA00:200:: /48 There are two things to notice from comparing the full length format to the compressed format. In the compressed format, the trailing zeros have been omitted from the full length address, this tells you, from the 4 th to 8 th hextect, they are all 0’s. Any preceding 0’s can be omitted from the long format version, as you can see from full length format, 0200 becomes 200 in the compressed format. Network                                 ...

Anycast Address in IPv6 An anycast address is an address that can exist more than once anywhere in the network. Anycasting is a method used to advertise one IP address from multiple points in the network topology, and with the help of dynamic routing method, the traffic is delivered to the nearest point. Although anycast works by having multiple receivers, only one receiver is selected from all the available ones. This kind of address is basically enabling us to have servers and services physically closer to us as they would be if the unicast address was used. It this way we are able to have, for example, a server with one anycast IP address somewhere in US and other server with same service and same IP address somewhere is Europe. Based on routing protocols, the DNS request will be sent to the nearest server to the requester. Benefits of Anycast 1.1          Anycast makes DNS reliable When you deploy identical s...