Posts Tagged ‘tunnels’
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 prefix is 2002::/16 (Core Knowledge Alert!). To this prefix, the IPv4 address of the border router is added, resulting in a /48 prefix. For example, if the border router possesses an external IPv4 address of 192.0.2.1, the resulting 6to4 site address space becomes 2002:c000:0201::/48. Keep in mind that this site will utilize this address space in its whole network, but hosts inside the network do not need to support the 6to4 technology.
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: