IPv6 transition mechanisms
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.
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)
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The IPv6 transition mechanisms are described in the IETF memos:
is_xxx() functions return a logical vector
extract_xxx() functions return an ip_address vector.
# 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"))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.