Synonyms for anycast or Related words with anycast
Examples of "anycast"
In 2003, DALnet put up their first
servers under the name "The IX Concept", and made irc.dal.net resolve to the
IP. Since then, most new client servers linked are
transmissions may solve this problem.
is normally highly reliable, as it can provide automatic failover.
applications typically feature external "heartbeat" monitoring of the server's function, and withdraw the route announcement if the server fails. In some cases this is done by the actual servers announcing the
prefix to the router over OSPF or another IGP. If the servers die, the router will automatically withdraw the announcement.
can record TX (also referred to as 'PGM') and isolated feeds to hard disk if required. One of the known hard-disks to work with the
is the Maxtor One-Touch III (350gb & 500gb).
The scope of an
address is defined identically to that of a unicast address.
IP addresses are classified into several classes of operational characteristics: unicast, multicast,
and broadcast addressing.
Like broadcast and multicast,
is a one-to-many routing topology. However, the data stream is not transmitted to all receivers, just the one which the router decides is logically closest in the network.
address is an inherent feature of only IPv6. In IPv4,
addressing implementations typically operate using the shortest-path metric of BGP routing and do not take into account congestion or other attributes of the path.
methods are useful for global load balancing and are commonly used in distributed DNS systems.
The effectiveness of this technique to divert attacks is questionable, however, because unicast addresses (used for maintenance) can be easy to obtain, at least on IPv6. RFC 2373 defines that "An
address must not be used as the source address of an IPv6 packet." Therefore, pinging an
address will return the unicast address of the closest node, since the reply must come from a unicast address. An attacker can then attack individual nodes from any location, bypassing
addressing methods. This same method works on some, but not all, IPv4
addresses. RFC 2373 also restricted
IPv6 addresses to routers only. However, both of these restrictions were lifted in RFC 4291.
providing two recursive nameserver addresses for public use, mapped to the nearest operational server location by
OpenDNS provides the following recursive nameserver addresses for public use, mapped to the nearest operational server location by
A host is required to join a Solicited-Node multicast group for each of its configured unicast or
methodologies on the Internet may be exploited to distribute DDoS attacks and reduce their effectiveness: As traffic is routed to the closest node, a process over which the attacker has no control, the DDoS traffic flow will be distributed amongst the closest nodes. Thus, not all nodes might be affected. This may be a reason to deploy
Content delivery networks may use
for actual HTTP connections to their distribution centers, or for DNS. Because most HTTP connections to such networks request static content such as images and style sheets, they are generally short-lived and stateless across subsequent TCP sessions. The general stability of routes and statelessness of connections makes
suitable for this application, even though it uses TCP.
The modern trend is to use
addressing and routing to provide resilience and load balancing across a wide geographic area. For example, the "j.root-servers.net" server, maintained by VeriSign, is represented by 104 () individual server systems located around the world, which can be queried using
Solicited-node multicast addresses are computed as a function of a node's unicast or
addresses. A solicited-node multicast address is created by copying the last 24 bits of a unicast or
address to the last 24 bits of the multicast address.
IPv6 addresses are classified by the primary addressing and routing methodologies common in networking: unicast addressing,
addressing, and multicast addressing.
In December 2013, DNSimple migrated all the customers from Unicast to a new
network composed of 5 points of presence.
Among others, members include DNS
operators providing instances of E, I and L root servers and over 100 gTLDs/ccTLDs
MaxCDN hosts Nginx servers in Europe, North America and Asia; MaxCDN utilizes
stateless routing for one-to-nearest content delivery over multiple 10 Gbit/s connections.
Nearly all Internet root nameservers are implemented as clusters of hosts using
addressing. 12 of the 13 root servers A-M exist in multiple locations, with 11 on multiple continents. (Root server H exists in two U.S. locations. Root server B exists in a single location in the Los Angeles Area.) The 12 servers with multiple locations use
address announcements to provide a decentralized service. This has accelerated the deployment of physical (rather than logical) root servers outside the United States. RFC 3258 documents the use of
addressing to provide authoritative DNS services. Many commercial DNS providers have switched to an IP
environment to increase query performance, redundancy, and to implement load balancing.
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