With TCP anycast, there are cases where the receiver selected for any given source may change from time to time as optimal routes change, silently breaking any conversations that may be in progress at the time.

Anycast allows any operator whose routing information is accepted by an intermediate router to hijack any packets intended for the anycast address.

An attacker can then attack individual nodes from any location, bypassing anycast addressing methods.

Providers willing to provide 6to4 service to their clients or peers should advertise the anycast prefix like any other IP prefix, and route the prefix to their 6to4 relay.

IPv6 addresses are classified by three types of networking methodologies: unicast addresses identify each network interface, anycast addresses identify a group of interfaces, usually at different locations of which the nearest one is automatically selected, and multicast addresses are used to deliver one packet to many interfaces.

However, in practice, the root nameserver infrastructure is highly resilient and distributed, using both the inherent features of DNS ( result caching, retries, and multiple servers for the same zone with fallback if one or more fail ), and, in recent years, a combination of anycast and load balancer techniques used to implement most of the thirteen nominal individual root servers as globally distributed clusters of servers in multiple data centers.

Some anycast deployment on the Internet distinguish between local and global nodes to provide benefit for the direct local community, by addressing local nodes preferentially.

RFC 2373 defines that " An anycast address must not be used as the source address of an IPv6 packet.

In 2003, DALnet put up their first anycast servers under the name " The IX Concept ", and made irc. dal. net resolve to the anycast IP.

Since then, most new client servers linked are anycast.

anycast ) to serve a single hostname or domain name, or multiple domain names to be served by a single computer.

Additionally, nine of the servers operate in multiple geographical locations using a routing technique called anycast, providing increased performance and even more fault tolerance.

Ten servers were originally in the United States ; some are now operated via anycast.

DHTs form an infrastructure that can be used to build more complex services, such as anycast, cooperative Web caching, distributed file systems, domain name services, instant messaging, multicast, and also peer-to-peer file sharing and content distribution systems.

The modern trend is to use anycast addressing and routing to provide resilience and load balancing across a wide geographic area.

For example, the j. root-servers. net root server, maintained by VeriSign, is represented by 41 () individual server systems located around the world, which can be queried using anycast addressing.

On the Internet, anycast is usually implemented by using BGP to simultaneously announce the same destination IP address range from many different places on the Internet.

In the past, anycast was suited to connectionless protocols ( generally built on UDP ), rather than connection-oriented protocols such as TCP that keep their own state.

However, there are many cases where TCP anycast is now used.

For this reason, anycast is generally used as a way to provide high availability and load balancing for stateless services such as access to replicated data ; for example, DNS service is a distributed service over multiple geographically dispersed servers.

As a result, operation of anycast services ( RFC 4786 ) has grown in popularity among network operators.

Some Internet root nameservers are implemented as clusters of hosts using anycast addressing.

The A, C, F, I, J, K, L and M servers exist in multiple locations on different continents, using anycast address announcements to provide a decentralized service.

* 1970 – Richard Nixon delivers a special congressional message enunciating Native American self-determination as official US Indian policy, leading to the Indian Self-Determination and Education Assistance Act of 1975.

* unicast delivers a message to a single specific node ;

* broadcast delivers a message to all nodes in the network ;

* multicast delivers a message to a group of nodes that have expressed interest in receiving the message ;

* geocast delivers a message to a geographic area

** American adventurer Richard Halliburton delivers a last message from a Chinese junk, before he disappears on a voyage across the Pacific Ocean.

The process that delivers an e-mail message writes it to a file in the directory with a unique filename.

* In the movie, Éponine delivers the message from Marius to Cosette, which Valjean intercepts, causing Valjean to come to the barricade to rescue Marius.

This could happen if a network e-mail delivery program delivers a new message at the same time as a mail reader is deleting an existing message.

Siletsky delivers Sobinski's message and invites Maria to dinner, hoping to recruit her as a spy for the Nazis.

On the same day The US ambassador in Jakarta, Ralph Boyce, personally delivers to the Indonesian President a message of growing concern that Americans could become targets of terrorist actions in her country.

Meanwhile, a worried Gordon calls Mr. Faber, who sends his son to Selina and delivers Gordon's message to meet the next day.

Finally the sender specifies the recipient's e-mail address and the web site delivers an e-mail message to the recipient on behalf of the sender.

Afterwards, Johnny tries to phone Devi with a prerecorded message, but she delivers a diatribe against him.

The Enterprise delivers Klaang to Qo ' noS, where Klaang delivers his message ( via the DNA in his blood ) to the Klingon Chancellor and the High Council.

In this usage Rhema refers to " a word that is spoken ", when the Holy Spirit delivers a message to the heart as in Romans:

When he delivers the message he says, " Tell Anthony I love him ".

Kosh also delivers a message to Lochley for President Sheridan: " When the long night comes, return to the end of the beginning.

As each Ranger delivers his message to the widely dispersed friends, we get a glimpse into the lives these people have led since they left B5.

In October 1973, a Portland, Oregon business owner delivers a message to Governor Tom McCall in response to his executive order curtailing commercial lighting during the 1970s energy crisis.

The RMD delivers the message to the AD.