Contents
How many IPv6 addresses are in a 48?
65,536
IPv6 Relative Network Sizes
| /128 | 1 IPv6 address | A network interface |
|---|---|---|
| /48 | 65,536 LAN segments | Popular prefix size for one subscriber site |
| /32 | 65,536 /48 subscriber sites | Minimum IPv6 allocation |
| /24 | 16,777,216 subscriber sites | 256 times larger than the minimum IPv6 allocation |
How is an EUI-64 format interface ID created?
An interface ID is created by inserting the hex number FFFE in the middle of the MAC address of the network card. Also, the 7th bit in the first byte is flipped to a binary 1. The interface ID created this way is known as the modified extended unique identifier 64 (EUI-64). Invert the seventh bit of the interface ID.
Why is the Universal bit used in EUI-64?
The use of the universal/local bit in the Modified EUI-64 format identifier is to allow development of future technology that can take advantage of interface identifiers with universal scope. 6.
When do you inverted the you L bit?
Next, the seventh bit from the left, or the universal/local (U/L) bit, needs to be inverted. This bit identifies whether this interface identifier is universally or locally administered. If 0, the address is locally administered and if 1, the address is globally unique.
Why is the you / L bit inversed in IPv6?
In short, because in the ethernet MAC, seventh bit is defined to mean local/#global, while in IPv6 seventh bit in the 64-bit interface ID is defined to mean global/#local. ..:FF:FE:.. in the middle of it to fill up all the 64bits. Hence the name EUI-64.
What’s the difference between EUI-64 and IPv6?
IPv6 EUI-64 explained. EUI-64 (Extended Unique Identifier) is a method we can use to automatically configure IPv6 host addresses. An IPv6 device will use the MAC address of its interface to generate a unique 64-bit interface ID. However, a MAC address is 48 bit and the interface ID is 64 bit.