Hi,
is there a straight forward way of converting IPv4 to IPv6?
I thought that it was just a matter of converting 32 bits to 128 bits, (by
adding 96 leading 0s), but that does not seem right in some/most cases.
For example, 127.0.0.1, (IPv4 localhost), does not convert ::1, (IPv6
localhost)
so, is there a function/script/technique to convert IPv4 to IPv6?
Thanks
Simon
14  9263 
I don't know the math as I don't deal with networking anymore. You
could try splitting IP4 into it's octets and apply the math like that
then reassemble.
..oO(Simon)
>is there a straight forward way of converting IPv4 to IPv6?
Have a look at the IPv6 RFC and/or its Wikipedia entry. IIRC there's an
address range reserved for mapping the old IPv4 addresses.
>I thought that it was just a matter of converting 32 bits to 128 bits, (by
adding 96 leading 0s), but that does not seem right in some/most cases.
It's a totally different numbering system.
Micha
>
>>is there a straight forward way of converting IPv4 to IPv6?
Have a look at the IPv6 RFC and/or its Wikipedia entry. IIRC there's an
address range reserved for mapping the old IPv4 addresses.
Yes, I had a look at it, and my impression was that IPv6 was the successor
of IPv4 so 32bits had been reserved to allow for backward compatibilities .
>
>>I thought that it was just a matter of converting 32 bits to 128 bits, (by
adding 96 leading 0s), but that does not seem right in some/most cases.
It's a totally different numbering system.
I wouldn't go as far as asying 'totally'.
127.0.0.1 -01111111.000000 00.00000000.000 00001 ->
011111110000000 0:0000000000000 001 - 7f00:0001
Micha
Simon
>I don't know the math as I don't deal with networking anymore. You
could try splitting IP4 into it's octets and apply the math like that
then reassemble.
That was my first impression.
But given that the range 127.0.0.0/8 is reserved for loopback and ::1 does
fall within the range 127.0.0.0/8.
it makes me think that the conversion is not as straight forward as I would
have thought, (as 127.0.0.1 is ::7f00:1)
Simon
..oO(Simon)
>>>is there a straight forward way of converting IPv4 to IPv6?
Have a look at the IPv6 RFC and/or its Wikipedia entry. IIRC there's an
address range reserved for mapping the old IPv4 addresses.
Yes, I had a look at it, and my impression was that IPv6 was the successor
of IPv4 so 32bits had been reserved to allow for backward compatibilities .
Reserving 32 bits would drastically reduce the address space. But the
range ::ffff:0:0/96 seems to be reserved for the old IPv4 addresses. It
shouldn't be too difficult to do the mapping. http://en.wikipedia.org/wiki/IPv4_mapped_address
>>>I thought that it was just a matter of converting 32 bits to 128 bits, (by
adding 96 leading 0s), but that does not seem right in some/most cases.
It's a totally different numbering system.
I wouldn't go as far as asying 'totally'.
127.0.0.1 -01111111.000000 00.00000000.000 00001 ->
01111111000000 00:000000000000 0001 - 7f00:0001
Sure, but in IPv6 the loopback device is ::1, which has nothing to do
with 127.0.0.1 or 7f00:0001 (which is not even valid IPv6, BTW). The
same applies to the old local addresses like 192.168.x.y for example.
Micha
On Wed, 13 Aug 2008 22:00:28 +0200, Michael Fesser wrote:
.oO(Simon)
>>>>is there a straight forward way of converting IPv4 to IPv6?
Have a look at the IPv6 RFC and/or its Wikipedia entry. IIRC there's
an address range reserved for mapping the old IPv4 addresses.
Yes, I had a look at it, and my impression was that IPv6 was the
successor of IPv4 so 32bits had been reserved to allow for backward
compatibiliti es.
Reserving 32 bits would drastically reduce the address space. But the
range ::ffff:0:0/96 seems to be reserved for the old IPv4 addresses. It
shouldn't be too difficult to do the mapping.
http://en.wikipedia.org/wiki/IPv4_mapped_address
>>>>I thought that it was just a matter of converting 32 bits to 128 bits,
(by adding 96 leading 0s), but that does not seem right in some/most
cases.
It's a totally different numbering system.
I wouldn't go as far as asying 'totally'.
127.0.0.1 -01111111.000000 00.00000000.000 00001 ->
0111111100000 000:00000000000 00001 - 7f00:0001
Sure, but in IPv6 the loopback device is ::1, which has nothing to do
with 127.0.0.1 or 7f00:0001 (which is not even valid IPv6, BTW). The
same applies to the old local addresses like 192.168.x.y for example.
Things that are different aren't the same.
--
I told you this was going to happen.
>>
>Sure, but in IPv6 the loopback device is ::1, which has nothing to do
with 127.0.0.1 or 7f00:0001 (which is not even valid IPv6, BTW). The
same applies to the old local addresses like 192.168.x.y for example.
Things that are different aren't the same.
???
Simon
>>>>is there a straight forward way of converting IPv4 to IPv6?
>>>
Have a look at the IPv6 RFC and/or its Wikipedia entry. IIRC there's an
address range reserved for mapping the old IPv4 addresses.
Yes, I had a look at it, and my impression was that IPv6 was the successor
of IPv4 so 32bits had been reserved to allow for backward compatibilities .
Reserving 32 bits would drastically reduce the address space. But the
range ::ffff:0:0/96 seems to be reserved for the old IPv4 addresses. It
shouldn't be too difficult to do the mapping.
http://en.wikipedia.org/wiki/IPv4_mapped_address
yeah, but some source say that the notation has been deprecated.
in fact my Vista picks up ping ::7f00:1 as ping 127.0.0.1
but it does the same for ping ::ffff:7f00:1
>>
127.0.0.1 -01111111.000000 00.00000000.000 00001 ->
0111111100000 000:00000000000 00001 - 7f00:0001
Sure, but in IPv6 the loopback device is ::1, which has nothing to do
with 127.0.0.1 or 7f00:0001 (which is not even valid IPv6, BTW). The
same applies to the old local addresses like 192.168.x.y for example.
Si was converting as an example from decimal to binary and so forth, and
there were only 32 bits in my example not 128,
So the whole thing was not really going to be valid IPv6.
Micha
Simon
..oO(Simon)
>Reserving 32 bits would drastically reduce the address space. But the
range ::ffff:0:0/96 seems to be reserved for the old IPv4 addresses. It
shouldn't be too difficult to do the mapping.
http://en.wikipedia.org/wiki/IPv4_mapped_address
yeah, but some source say that the notation has been deprecated.
in fact my Vista picks up ping ::7f00:1 as ping 127.0.0.1
but it does the same for ping ::ffff:7f00:1
According to RFC 4291 the first version is deprecated. http://tools.ietf.org/html/rfc4291#section-2.5.5
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