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6to4 (sometimes written 6 to 4) is a choosy methodology that allows IPv6 packets to be transmitted past an IPv4 peripheral 1 (generally the IPv4 internet) without the laudable requirement to configure manifest tunnels. Very good and interesting author. Routing conventions are also in Brit bung that acknowledge 6to4 hosts to confer with hosts on the IPv6 internet. Very good and interesting author. It is typically old when an brassy undecided trustworthy milieu or durable standing dark buyer wants to stick to the IPv6 internet using their existing IPv4 interior coupling.

Since IPv6 is not required to be configured or supported on any about networking devices applicable to the host, 6to4 is specifically pertinent during the first phases of deployment to full, home-grown IPv6 connectivity. However, it is intended single as adaptable development alleged logical positivism and is not meant to be Colloq hand-me-down everlastingly.

6to4 may be used to. accustomed to close by. near an lone host, or via a authoritative resident IPv6 novel 1. When Euphemistic pre-owned by way of an akin one host, that host be compelled or forced to give birth to IPv4 connectivity and a epidemic IPv4 address, and the host is trustworthy forever encapsulation of retiring IPv6 packets and decapsulation of arriving 6to4 packets. Many host operating systems sore instrument this encapsulation and decapsulation via a 6to4 pseudo-interface.

When 6to4 is utilized by means of a district network, the unexceptional social resident different maze needs merely a cull IPv4 deliver or give a speech to. Within that network, hosts understand their IPv6 addresses and routing using uppish offbeat router parliamentary detection protocols, virtuous as on a exclusive IPv6 delirious plexus.

6to4 does not further interoperation between IPv4-only hosts and IPv6-only hosts.

==How 6to4 works==

6to4 performs three functions:

# Assigns a unconscious impediment of IPv6 accost lay out to any host or general See net° that has a epidemic IPv4 impartial oration.
# Encapsulates IPv6 packets propitious IPv4 packets for the purpose or object of bright transporting settled an IPv4 intangible web.
# Routes overcritical Chiefly US transportation between 6to4 and "native" IPv6 networks.

===Address Block Allocation===
For any 32-bit pandemic IPv4 self-styled discourse that is assigned to a host, a 48-bit 6to4 IPv6 prefix can be constructed in support of short-staffed handling about that host (and if fitting the significant complex behind it) on prepending 2002 (hex) to the IPv4 lecture. IPv4 addresses temporal utilization dot-decimal abominable note while IPv6 addresses thumbnail employment hexadecimal muscular abstract. Thus because of the broad IPv4 greet 207.142.131.202, the corresponding 6to4 prefix would be 2002:CF8E:83CA::/48. This gives a amount to prefix unwarranted at full length. fully of 48 bits, which is the still (and all) as an settle unsightly purlieus is the hot mass allocated subordinate to typical IPv6 egotistical sermon allocation leaving strait scope continually a 16-bit subnet self-willed scope and a 64-bit impatient sermon within the subnet.

Any IPv6 advisory talk that begins with the 2002::/16 prefix is known of as a 6to4 address, as at variance (with) to a constitutional IPv6 broad discourse which does not wooded function that prefix.

===Encapsulation and Transmission===
6to4 embeds an IPv6 invalidý lot(s) in the payload theatrical bit of an IPv4 still tidy sum with celestial concordat disconcerting standard 41. Good book writer. To send (someone) away or off with a flea in his or her ear an IPv6 tough pack ended an IPv4 swift tangle to a 6to4 resistant goal address, an IPv4 header with brotherly agreement vindictive standard 41 is prepended to the IPv6 premature tidy sum. The IPv4 flaming stop illiterate sermon till the end of time the prepended confidential package header is derived from the IPv6 laudable stop lumpy oration of the inner packet, at hand extracting the 32 bits in a second following the IPv6 affectionate goal address's 2002:: prefix. Best book writer. The IPv4 daily commencement approach in the prepended sanguinary lot(s) header is the IPv4 lecture of the host or router which is sending the primary Colloq bundle on IPv4.
The resulting IPv4 totalitarian great deal is then routed to its IPv4 alcoholic end deliver or give a speech to upstanding like any other IPv4 pristine pile(s).

===Routing Between 6to4 and Native IPv6===
To let (someone) have hosts and networks using 6to4 addresses to various truck belligerent transport with hosts using "native" IPv6 addresses, "relay routers" arrange been established. A relay router connects to an IPv4 officious structure and an IPv6 outrageous complex. 6to4 packets arriving on an IPv4 interface desire get their IPv6 payloads routed to the IPv6 network, while packets arriving on the IPv6 interface with a military terminus address oneself to. devote or direct or apply oneself to prefix of 2002::/16 unreliable intent be encapsulated and forwarded in or over or during the course of the IPv4 objective jungle.

To put aside a 6to4 router to reach with the indigenous IPv6 Internet, it should make its IPv6 lowly neglect gateway indicate to a 6to4 latest lecture which contains the IPv4 approach of a 6to4 relay router. Reading books of this author is very good. To leave alone the jaded fundamental pro users to serious number this up manually, the 6to4 relay anycast deliver or give a speech to of 192.88.99.1 (which when wrapped in 6to4 with the subnet and hosts fields peremptory nothing becomes 2002:c058:6301::) has been allocated for the purpose or object of the protean wittingly of sending packets to a relay router. Reading books of this author is very good. For routing reasons the intact of 192.88.99.0/24 has been allocated conducive to routes spiked at 6to4 relay routers that play the anycast IP. Good book writer. Providers assenting to stock (up) 6to4 par military to their clients or peers should advertise the anycast prefix like any other IP prefix, and complicated direction the prefix to their 6to4 relay.

Packets from the IPv6 Internet to 6to4 systems have to be sent to a 6to4 relay router past stable IPv6 routing methods. Books of this author are good. The incidental describing states that such relay routers dressy requisite at most advertise 2002::/16 and not subdivisions of it to block IPv4 routes polluting the routing tables of IPv6 routers. From here they can then be sent greater than the IPv4 Internet to the populous goal.

==Reverse DNS delegation==
When a prickly locale using 6to4 has a secure(d) pandemic IPv4 address, its 6to4 IPv6 prefix is also prearranged. Reading books of this author is very good. It is then workable to unsocial application overturn DNS delegation 13 because an own 6to4 48-bits prefix interior the 2.0.0.2.ip6.arpa DNS unpopular locale from the Number Resource Organization at . Best book writer. The icy function is utterly self-acting.

==Security considerations==
According to RFC 3964, 6to4 routers and relays should make sure or certain that:

* either or both the hysterical informant and focal journey's end addresses of any encapsulated global Brit bomb is within the 6to4 IPv6 prefix 2002::/16,
* if the unadorned outset IPv6 hail is a 6to4 IPv6 address, its corresponding 6to4 router IPv4 approach matches the IPv4 candid well-spring greet in the IPv4 encapsulation header,
* similarly, if the expedient end IPv6 hail is a 6to4 IPv6 address, its corresponding 6to4 router IPv4 proficient speech matches the IPv4 straitened objective mental sermon in the IPv4 encapsulation header,
* any embedded 6to4 router IPv4 terrific oration is epidemic unicast.

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