class IPAddress::IPv6::Loopback

Overview

The loopback address is a unicast localhost address. If an application in a host sends packets to this address, the IPv6 stack will loop these packets back on the same virtual interface.

Loopback addresses are expressed in the following form:

::1

or, with their appropriate prefix,

::1/128

As for the unspecified addresses, IPv6 loopbacks can be created with IPAddress calling their own class:

ip6 = IPAddress::IPv6::Loopback.new
ip6.to_string # => "::1/128"

or by using the wrapper:

ip6 = IPAddress.new "::1"
ip6.to_string # => "::1/128"

Checking if an address is loopback is easy with the IPv6#loopback? method:

ip6.loopback? # => true

The IPv6 loopback address corresponds to 127.0.0.1 in IPv4.

Defined in:

ipaddress/ipv6_loopback.cr

Constructors

Instance methods inherited from class IPAddress::IPv6

<=>(other : IPv6) <=>, ==(other : self) ==, [](index : Int32) : Int32 [], []=(index : Int32, value : Int32) : Nil []=, address : String address, bits : String bits, broadcast_u128 : BigInt broadcast_u128, compressed : String compressed, data : Bytes data, each(&) : Nil each, groups : Array(Int32) groups, hash(hasher) hash, hexs : Array(String) hexs, includes?(others : Array(IPv6))
includes?(other)
includes?(*others : IPv6) includes?, link_local? link_local?, literal : String literal, loopback? loopback?, mapped? mapped?, network : IPv6 network, network? network?, network_u128 : BigInt network_u128, pred : IPv6 pred, prefix : Prefix128 prefix, prefix=(prefix : Int32) : Prefix128 prefix=, reverse : String reverse, size : BigInt size, succ : IPv6 succ, to_big_i : BigInt to_big_i, to_hex : String to_hex, to_s(io : IO) to_s, to_string : String to_string, to_string_uncompressed : String to_string_uncompressed, unique_local? unique_local?, unspecified? unspecified?

Constructor methods inherited from class IPAddress::IPv6

new(addr : String, netmask = nil) new, parse_data(data : Bytes, prefix = 128) : IPv6 parse_data, parse_hex(hex : String, prefix = 128) : IPv6 parse_hex, parse_u128(u128 : BigInt, prefix = 128) : IPv6 parse_u128

Class methods inherited from class IPAddress::IPv6

compress(addr : String) : String compress, expand(addr : String) : String expand, groups(addr : String) : Array(Int32) groups, valid?(addr : String) valid?

Instance methods inherited from module IPAddress

ipv4? ipv4?, ipv6? ipv6?

Constructor methods inherited from module IPAddress

new(addr : String | Int) : IPAddress new, parse(addr : String | Int) : IPAddress parse

Class methods inherited from module IPAddress

aton(addr : String) : UInt32 aton, ntoa(uint : UInt32) : String
ntoa(int : Int) : String ntoa, valid?(addr : String) valid?, valid_ipv4?(addr : String) valid_ipv4?, valid_ipv4_netmask?(addr : String) valid_ipv4_netmask?, valid_ipv6?(addr : String) valid_ipv6?

Constructor Detail

def self.new #

Creates a new IPv6 unspecified address.

ip6 = IPAddress::IPv6::Loopback.new
ip6.to_string # => "::1/128"

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