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1. CAN YOU USE ROUTER ON A STICK USING IPV6 STATELESS 64 BITS
2. CAN YOU USE ROUTER ON A STICK USING IPV6 STATELESS MAC

CAN YOU USE ROUTER ON A STICK USING IPV6 STATELESS MAC

That is the FFFE in hex that is squeezed between two parts of physical MAC address of that interface on which the address is beeing generated. The ccccccccc’s are firs the part of MAC address called Organizationally Unique Identifier (OUI) and mmmmmmmmm’s are the second part called Network Interface Controller (NIC). You also see 11111111 11111110 in the middle of the address. The picture is from RFC 2373 page 19 where actual EUI-64 is defined. You see the 7th-bit is written as “1”, that is the universal/local bit. In the picture below, you can see EUI-64 at work. This is done in order to indicate the global scope. After that, EUI-64 sets the 7th universal/local sign bit in the field of Interface ID address which it actually the bit that says if that address is locally generated by SLAAC using EUI-64 process or it’s received from DHCP. As per the standard of the IEEE EUI-64 the hex value, FFFE is placed into the centre of the MAC address.

CAN YOU USE ROUTER ON A STICK USING IPV6 STATELESS 64 BITS

The host requires to derive the 16 bits from some other source as the MAC address is 48 bits long and the process of EUI-64 makes up the last 64 bits of an IPv6 address. But it is important for this information to be both from a known source as well as long enough to become globally unique.Įthernet hosts and intermediary devices with Ethernet interfaces make use of their 48-bit MAC addresses as a source for making EUI-64 addressing. The piece of information must not exceed beyond 64 bits because by definition EUI-64 needs a 64-bit interface ID and a 64-bit prefix. The host requires already known and a globally unique piece of information. With the EUI-64 format, the configuration of the interface ID takes place locally by the host in order to make it globally unique. What format should be used by the host for these addresses in order to ensure that there will not accidentally be two or more equal addresses autoconfigured? The EUI-64 is that format. But there is another question here that needs to be asked. That second part is the autoconfiguration of the address. This part is a job for network administrator, after he defines the network prefix the second part will make the rest. Of course, all hosts in this network need to have NETWORK part of the address same, if not, they will not be able to communicate. The first part is about setting the prefix for this local network. This is because an IPv6 host needs to be sure that the autoconfigured addresses are unique on a global level. EUI-64 Address FormatĮUI-64 in Automatic configuration is the most important aspect of IPv6 addressing. SLAAC uses NDP protocol to work.Īs the format of the EUI-64 format is seen quite frequently, covering its details seems important too. SLAAC is a method in which the host or router interface is assigned a 64-bit prefix, and then the last 64 bits of its address are derived by the host or router with help of EUI-64 process which is described in next few lines. Details are available here in my new article about SLAAC. The thing is that today RFC 7217 describes an enhanced new way of SLAAC algorithm to improve user security and protect hosts from attacks. Article is correctly describing what is SLAAC and why is needed and describes how SLAAC uses RFC 2373 to generate interface IPv6 address.