Dec
16
IPv6 multicast is an important new blueprint topic for the Version 4.X CCIE R&S Lab Exam as well as the Written Qualification Exam. In this post, we will start at the most logical starting point for this topic - the IPv6 multicast addressing in use. Like in IP version 4, multicast refers to addressing nodes so that a copy of data will be sent to all nodes that possess the address. Multicast allows for the elimination of broadcasts in IPv6. Broadcasts in IP version 4 were problematic, since the... Read More
Oct
18
It is time now for us to wrap up this series on IPv6 transition techniques (in the scope of the R&S CCIE Written and Lab exam). For this final part, we turn to an existing blog post from our own resident genius, Petr Lapukhov. I edited his post to ensure we mere mortals could understand it. :-) Read More
Oct
17
For those of you that have been following the previous parts of this blog series (they are located in the IPv6 subcategory of the CCIE R&S category to the left), get ready for a major paradigm shift. So far, we have been experimenting with transition techniques (tunnels) that have focused on connecting remote "island" networks of IPv6 over an IPv4-only infrastructure. Now we are going to discuss a mechanism that was designed to help IPv4-only hosts communicate to other native IPv6 devices.... Read More
Sep
19
Join INE Instructors as they cover IPv6 Multicast Part 1 in the Advanced Technologies Class on Demand - 10-Day. This is a key new topic found in the version 4.0 CCIE R&S blueprint. Read More
Sep
09
For Part 1 of this series, click here. For Part 2 of this series, click here. 6to4 tunnels allow for the dynamic creation of IPv6 within IPv4 tunnels. While the previous two tunnel mechanisms we examined were point-to-point type structures, this tunneling approach is considered a dynamic point-to-multipoint type. Since it is dynamic tunnel, we are going to do the very strange step of NOT assigning a tunnel destination as you will see. 6to4 tunnels rely on reserved address space. The reserved... Read More
Aug
28
For Part 1 of this series on IPv6 Transition Mechanisms, click here. If you loved the simplicity of the IPv6 manual tunnel we created in Part 1, you should love the Generic Routing Encapsulation (GRE) approach to tunneling IPv6 traffic through an IPv4 cloud just as much. This simple approach takes the IPv6 packet and encapsulates it using the standard IPv4 GRE tunnel. But wait a minute? In Part 1 of this blog series, we had IPv4 encapsulate the IPv6 packet directly for tunneling across the v4... Read More
Aug
16
This blog series was recommended by another of our awesome students and IEOC community members, Marcio A. Costa. In the first part of this series, we will look at the Manual IPv6 tunnels that are simple to create in order to connect two "islands" of IPv6 separated by IPv4-only devices. For this blog, we will use the following simple topology: Read More
Apr
18
IPv6 NAT-PT is to be used with IPv4 to IPv6 migration scenarios and it's purpose is to provide bi-directional connectivity between IPv4 and IPv6 domains. Cisco points out that many other transition techniques are possible, and NAT-PT (Network Address Translation - Protocol Translation) should not be used when other, more "native" options exist, such as having dual stack hosts communicate directly through dual stack routers. Another example provided of when NAT-PT is not needed is when two... Read More

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