- #How to convert mac address to ip6 address serial#
- #How to convert mac address to ip6 address manual#
- #How to convert mac address to ip6 address registration#
We can see this conversion in action when we assign an IPv6 address to a router interface. Rather, the meaning of the bit is inverted for convenience, so the value of the bit must be inverted as well. The important part to remember here is that the scope of the address never changes: global addresses are still global and local addresses are still local. The alternative would have been for these to be of the form 0200:0:0:1, 0200:0:0:2, etc., instead of the much simpler ::1, ::2, etc.
#How to convert mac address to ip6 address serial#
This is expected to be case for serial links, tunnel end-points, etc. The motivation for inverting the "u" bit when forming the interface identifier is to make it easy for system administrators to hand configure local scope identifiers when hardware tokens are not available. The answer lies buried in section 2.5.1 of RFC 2373: The U/L bit is inverted when using an EUI-64 address as an IPv6 interface ID.Īgain, you're probably wondering why this is done. Likewise, locally created addresses, such as those used for virtual interfaces or a MAC address manually configured by an administrator, will have this bit set to one.
Globally unique addresses assigned by the IEEE originally have this bit set to zero, indicating global uniqueness. The second step is to invert the universal/local (U/L) flag (bit 7) in the OUI portion of the address. In other words, any EUI-64 address having 0xFFFE immediately following its OUI portion can be recognized as having been generated from an EUI-48 (or MAC) address.
#How to convert mac address to ip6 address registration#
Why 0xFFFE? As explained in the IEEE's Guidelines for EUI-64 Registration Authority, this is a reserved value which equipment manufacturers cannot include in "real" EUI-64 address assignments. The 16-bit hex value 0xFFFE is then inserted between these two halves to form a 64-bit address. To do this, we break the MAC address into its two 24-bit halves: the Organizationally Unique Identifier (OUI) and the NIC specific part. The first step is to convert the 48-bit MAC address to a 64-bit value. RFC 2373 dictates the conversion process, which can be described as having two steps. This is accomplished on Ethernet interfaces by referencing the already unique 48-bit MAC address, and reformatting that value to match the EUI-64 specification.
#How to convert mac address to ip6 address manual#
By implementing the IEEE's 64-bit Extended Unique Identifier (EUI-64) format, a host can automatically assign itself a unique 64-bit IPv6 interface identifier without the need for manual configuration or DHCP.
These addresses can be in either 6to4 notation or IPv4-mapped notation.One of IPv6's key benefits over IPv4 is its capability for automatic interface addressing. You can only convert valid IPv4 represented IPv6 addresses. Not all IPv6 address can be converted to IPv4. What IP addresses can be converted from IPv6 to IPv4? If you like to perform the inverse conversion, you can do so by using the IPv4 to IPv6 conversion tool. IPv6 addresses represented in either 6to4 notation or IPv4-mapped notation will be converted back to their original IPv4 format.
All you need to do is enter the IPv6 address and press the convert button. How do you convert an IPv6 address into an IPv4 address?īy using the IPv6 to IPv4 converter tool on this page, you can instantly convert any valid IPv6 address into an IPv4 address. IPv6 addresses can be converted from either the 6to4 notation or IPv4-mapped notation into IPv4 addresses.