What does 6to4 tunnel mean?
“6to4 tunneling” is an IPv6 transition mechanism described in RFC 3056. A 6to4 tunnel interface automatically converts the 32 bits in its IPv6 address following this prefix to a global unicast IPv4 address for transport across an IPv4 network such as the public Internet.
What do 6to4 addresses always start with?
2002
6to4 addresses are easily recognizable because they always start with 2002. Because every 6to4-derived IPv6 address maps to an IPv4 address, it’s easy for a system that understands 6to4 to tunnel the IPv6 packets to the right place over IPv4.
What is IPv4 anycast relay?
Anycast 6to4 relay routers have the well-known IPv4 address 192.88. 99.1. The anycast relay router that is physically nearest to your site becomes the endpoint for the 6to4 tunnel. This relay router then handles packet forwarding between your 6to4 site and a native IPv6 site.
What port does 6to4 use?
Some IPv6 tunnels with the use of NetFlow to detect protocol 41 (this is protocol and not UDP/TCP port) or UDP port 3544 (which is the default Teredo UDP port) or traffic to 192.88. 99.1 (which is the default anycast address of 6to4 relays).
What is the main difference between 6to4 and Teredo?
Unlike 6to4, where the two halves of a connection can use different relays, traffic between a native IPv6 host and a Teredo client uses the same Teredo relay, namely the one closest to the native IPv6 host network-wise.
What is 6to4 address?
Any IPv6 address that begins with the 2002::/16 prefix (in other words, any address with the first two octets of 2002 hexadecimal) is known as a 6to4 address, as opposed to a native IPv6 address which does not systematically use transition technologies.
What is IPv6 and 6to4?
6to4 is an Internet transition mechanism for migrating from Internet Protocol version 4 (IPv4) to version 6 (IPv6) and a system that allows IPv6 packets to be transmitted over an IPv4 network (generally the IPv4 Internet) without the need to configure explicit tunnels. The first 64 bits are the IPv6 prefix.
Can IPv6 route to IPv4?
IPv6 over IPv4 tunnels are point-to-point tunnels made by encapsulating IPv6 packets within IPv4 headers to carry them over IPv4 routing infrastructures. This allows isolated IPv6 end systems and devices to communicate without the need to upgrade the IPv4 infrastructure that exists between them.
What is 6to4 prefix?
What is the configuration of the 6to4 relay router?
The configuration on the 6to4 relay router is as shown below. The 6to4 relay Anycast address is assigned to its loopback interface which is also used as the tunnel source. Loopback1 is used to simulate a host with a native IPv6 address:
What is the 6to4 relay anycast address?
The 6to4 relay Anycast address is assigned to its loopback interface which is also used as the tunnel source. Loopback1 is used to simulate a host with a native IPv6 address:
What is a 6to4 tunnel and how does it work?
The 6to4 tunnel allows the host to communicate with the native IPv6 Internet through the use of the relay router; therefore, a relay router must be set on the host as a default gateway for all IPv6 routes (except 2002::/16).
What are the issues with 6to4 networks?
Many of the issues regarding the use of 6to4 revolve around the use of relays. For example, the “closest” relay router to a 6to4 may be too far thus increasing latency. Also, the fact that public relays are “public” means that there is no proper service delivery guarantee.