Multiple IPv4 address and port number - IPv6 address
mapping encapsulation (M4P6E)WIDE ProjectJapannaoki.matsuhira@gmail.comIPv6DraftThis document specifies Multiple IPv4 address and port number - IPv6
address mapping encapulation (M4P6E) specification.The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119.This document provides Multiple IPv4 address and port number - IPv6
address mapping encapulation (M4P6E) base specification.M4P6E provide IPv4 address sharing function without Network Address
Translation (NAT). M4P6E require IPv6
network. shows M4P6E address architecture.
M4P6E address consists four parts, M4P6E prefix, IPv4 network plane ID,
IPv4 address, and Port number.:<-->|
| : ID |
| (n bits)
]]>In M4P6E, boundary of locator and identifier is in port number part,
that mean, M4P6E use upper part of port number as locator, and lower
part of port number as identifier. show a example of M4P6E address
format. In this example, 16bits IPv4 network plane ID is used, that
provide 65535 IPv4 network plane. shows a example of M4P6E usage in
client environments. In this document, NAPT is IPv4 - IPv4 Netowrk
address and port number translator. Coopetation with NAPT, M4P6E
provide IPv4 address sharing with different users. shows an example of M4P6E usage in
server environments. In this example, server terminate M4P6E tunnel.
This case, Server require at least one port number per server, that
mean, 128bits host route advertise for server access via IPv4. This
case, full access is provided via IPv6. shows an example of M4P6E usage
in Data Center environments. In this example, M4P6E is used only in
Data Center Backend Network closely. Client which is connected via
backbone network does not know the exists of M4P6E. M4P6E can provide
at least one port number per server, this case, 128bits host route is
advertised, however this route in advertised only in data center
backbone network. Ofcource, IPv6 address may allocated to the server,
so full access is provided via IPv6..<----- M4P6E ----->
. communication
.
------- Normal IPv6 communication ----------------->
.
]]>M4P6E require port number of transport layer. M4P6E can not support
ICMPv4. The function provided by ICMPv4
does not work in M4P6E environments, such as Path
MTU Discovery, ping command, etc.M4P6E can not also support IPv4 IPsec ESP because transport header is encrypted.This document makes no request of IANA.Note to RFC Editor: this section may be removed on publication as an
RFC.M4P6E use automatic tunneling technologies. Security consideration
related tunneling technologies are discussed in RFC2893, RFC2267,
etc.