I can appreciate this article much more. The relay router then sends the now IPv6—only packets onto the IPv6 network, where the packets are ultimately retrieved by a router at Site B. The following figure shows a 6to4 tunnel between two 6to4 sites. For any bit global IPv4 address that is assigned to a host, a bit 6to4 IPv6 prefix can be constructed for use by that host and if applicable the network behind it by appending the IPv4 address to It’s surprising IPv6 tunnel interfaces can be given only the network portion without the host portion of the IPv6 address. Keep up the great work mate. You can follow the question or vote as helpful, but you cannot reply to this thread.

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This is where 6to4 comes into play.

6to4 as a Transition Mechanism (IPv6 Administration Guide)

The next figure shows the parts of a subnet prefix for a 6to4 site, such as you would include in the ndpd. Ideally, IPv6 should be being configured to run in parallel with IPv4 obviously the situation in the real world is less than ideal. R3 ipv6 route This process is repeated to create 6to4 tunnel interfaces for the two other sites as well. He is known for his blog and cheat sheets here at Packet Life.


A relay router connects to an IPv4 network and an IPv6 network. If the host is configured to forward packets for other clients, often a local network, it is then a router. Keep up the great work mate. The first indicates that There are three key components relevant to 6to4: An Anycast Prefix for 6to4 Relay Routers.

Address spoofing is a major neywork on tunnels to a 6to4 relay router. Will give me some experience with IPV6. Ernesto guest November 24, at 7: Router B then uses the destination address in the IPv6 packet to forward the packets to the recipient host at Site B. Can you please explain this behavior? Note that internal routing networ, such as EIGRP and OSPFv3 cannot be used across 6to4 tunnels because link-local IPv6 addresses needed to form router adjacencies are not supported across 6to4 tunnels.

6to4 – Wikipedia

Each site has configured a router with an external connection to an IPv4 network. A host on Subnet 1 of 6to4 Site A sends a 6ti4, with a host at 6to4 Site B as the destination.

Packets from the IPv6 Internet to 6to4 systems must be sent to a 6to4 relay router by normal IPv6 routing methods. R1 config interface tunnel0 R1 config-if tunnel mode ipv6ip 6to4 R1 config-if tunnel source The next scenario uses the topology that is shown in Figure 4—3 as its example.


6to4 as a Transition Mechanism

Site A’s 6to4 router encapsulates each packet into a IPv4 header, which has the IPv4 address of the 6to4 relay router as its destination.

Also it seems to be affecting the following: The source IPv4 address for the new header is taken from the tunnel netwkrk address.

To remove the error message, a. This functionality enables the client to transport IPv6 traffic over an IPv4 infrastructure.

DoIT Network Services Knowledgebase

Your 6to4 site has a compelling business reason to communicate with certain native IPv6 hosts. To the determine the IPv6 address of the tunnel interface, we convert the IPv4 source address to hexadecimal in IPv6 notation, so that This is a really good explanation about automatic 6to4, as a matter of fact this is THE explanation.

Is there any example for multicast traffic over 6to4 tunnel?

For example, the global IPv4 address You have to use static routes or BGP. How to Configure a 6to4 Router. The destination IPv4 address is calculated from the next-hop address of our route for