ipv6-transition {ipaddress}

IPv6 transition mechanisms

Description

There are multiple mechanisms designed to help with the transition from IPv4 to IPv6. These functions make it possible to extract the embedded IPv4 address from an IPv6 address.

Usage

is_ipv4_mapped(x)

is_6to4(x)

is_teredo(x)

extract_ipv4_mapped(x)

extract_6to4(x)

extract_teredo_server(x)

extract_teredo_client(x)

Arguments

x

An ip_address vector

Details

The IPv6 transition mechanisms are described in the IETF memos:

• IPv4-mapped: RFC 4291

• 6to4: RFC 3056

• Teredo: RFC 4380

Value

• is_xxx(): A logical vector

• extract_xxx(): An ip_address vector

Examples

# these examples show the reserved networks
is_ipv4_mapped(ip_network("::ffff:0.0.0.0/96"))

is_6to4(ip_network("2002::/16"))

is_teredo(ip_network("2001::/32"))

# these examples show embedded IPv4 addresses
extract_ipv4_mapped(ip_address("::ffff:192.168.0.1"))

extract_6to4(ip_address("2002:c000:0204::"))

extract_teredo_server(ip_address("2001:0000:4136:e378:8000:63bf:3fff:fdd2"))

extract_teredo_client(ip_address("2001:0000:4136:e378:8000:63bf:3fff:fdd2"))