Many modern operating systems notify the administrator of IP address conflicts. IP addresses are classified into several classes of operational characteristics: unicast, multicast, anycast and broadcast addressing. It normally refers to a single sender or a single receiver, and can be used for both sending and receiving.
Usually, a unicast address is associated with a single device or host, but a device or host may have more than one unicast address. Sending the same data to multiple unicast addresses requires the sender to send all the data many times over, once for each recipient.
Broadcasting is an addressing technique available in IPv4 to address data to all possible destinations on a network in one transmission operation as an all-hosts broadcast. All receivers capture the network packet. The address In addition, a more limited directed broadcast uses the all-ones host address with the network prefix. For example, the destination address used for directed broadcast to devices on the network IPv6 does not implement broadcast addressing, and replaces it with multicast to the specially defined all-nodes multicast address. A multicast address is associated with a group of interested receivers.
In IPv4, addresses In either case, the sender sends a single datagram from its unicast address to the multicast group address and the intermediary routers take care of making copies and sending them to all interested receivers those that have joined the corresponding multicast group. Like broadcast and multicast, anycast is a one-to-many routing topology.follow link
However, the data stream is not transmitted to all receivers, just the one which the router decides is closest in the network. Anycast addressing is an built-in feature of IPv6. Anycast methods are useful for global load balancing and are commonly used in distributed DNS systems. A host may use geolocation software to deduce the geolocation of its communicating peer.
Public IP addresses may be used for communication between hosts on the global Internet.
For security and privacy considerations, network administrators often desire to restrict public Internet traffic within their private networks. The source and destination IP addresses contained in the headers of each IP packet are a convenient means to discriminate traffic by IP address blocking or by selectively tailoring responses to external requests to internal servers.
This is achieved with firewall software running on the network's gateway router. A database of IP addresses of permissible traffic may be maintained in blacklists or whitelists. Multiple client devices can appear to share an IP address, either because they are part of a shared hosting web server environment or because an IPv4 network address translator NAT or proxy server acts as an intermediary agent on behalf of the client, in which case the real originating IP address might be masked from the server receiving a request.
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A common practice is to have a NAT mask many devices in a private network. Only the "outside" interface s of the NAT needs to have an Internet-routable address. In residential networks, NAT functions are usually implemented in a residential gateway. In this scenario, the computers connected to the router have private IP addresses and the router has a public address on its external interface to communicate on the Internet.
The internal computers appear to share one public IP address. Computer operating systems provide various diagnostic tools to examine network interfaces and address configuration. Microsoft Windows provides the command-line interface tools ipconfig and netsh and users of Unix-like systems may use ifconfig , netstat , route , lanstat, fstat , and iproute2 utilities to accomplish the task.
From Wikipedia, the free encyclopedia. Numerical label used to identify a network interface in an IP network.
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Main article: IPv6 address. Internet portal Computer programming portal. Postel , ed. September RFC Deering ; R. Hinden December Network Working Group. Hinden July Rekhter; B. Moskowitz; D. Karrenberg; G. Lear February Address Allocation for Private Internets. BCP 5. Hinden; B. Haberman October Hinden; S. Deering April Huitema; B.
Carpenter September Deprecating Site Local Addresses.
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