The following table shows five prefixes and MAC unabbreviated IPv6 addresses convert these to the shortest possible abbreviated IPv6 address. Input an IPv6 address and the network prefix or subnet size in slash notation: Select a number of subnets or a subnet size to divide the above into: This IPv6 subnet calculator can be used the same way as our VLSM calculator, which is used to plan an IPv4 network. In other words, use the solicited node multicast prefix with those last 6 hex digits of the unicast IPv6 address. This multicast address is formed by taking the unicast address, and replacing the first 104 bits (26 hex digits) with FF02::1:FF00:0/104. Do some math on the first byte of the MAC address to invert (flip) the 7 th of 8 bits (counting left-to-right)įor this exercise, take the listed prefixes and MAC addresses, and create the IPv6 address the device would use.Įxtra credit: Also, if interested, you can think about the solicited node multicast address the host would use along with the unicast address.Insert hex FFFE in the middle between the two, completing the 16 hex digits in the 2nd half of the number.Split the MAC into two halves, each 6 hex digits / 3 bytes / 24 bits long.EUI-64 rules used by SLAAC tell you how to make the last 64 bits, as follows: However, then you have to convert the first byte, or at least the 2 nd hex digit, to binary and back. First, you use the learned prefix as the first 64 bits. Part 5: Convert MAC Addresses and IPv6 Addresses to Binary. Part 4: Determine the Number of Hosts in a Network Using Powers of 2. Convert the octet back into hexadecimal from binary. (The seventh bit will be 0, make it a 1). Note: The MAC address 11:22:33:44:55:66 will be used for the following examples. Part 3: Convert Host IPv4 Addresses and Subnet Masks into Binary. Take the MAC address and convert the first octet from hexadecimal into binary. Using these two facts, the process to form the full 128-bit IPv6 unicast address is pretty simple. Part 2: Convert between Numbering Systems. A 64-bit IPv6 prefix (typically learned from a router).The EUI-64 process to derive an IPv6 address begins with two facts, followed by a process that uses those facts. Related links: Deeper info from the ICND2 OCG book Today’s post lists sample problems the follow-up post will show the answers.
The goal: Starting with a MAC address and a /64 IPv6 prefix, predict the IPv6 address the host would use if using IPv6 Stateless Auto Address Configuration (SLAAC). Take the MAC address and convert the first octet from hexadecimal into binary. It’s icky for two reasons: it requires you to think in binary, and it rhymes.
Just enter the two IPv6 Addresses, the starting address and ending address separated by the hyphen, and this tool instantly converts the given ranges to their corresponding CIDR. This post starts a new type of review post for #ICND2 or #CCNA: the icky EUI-64 drill. IPv6 Range to CIDR Calculator instantly converts the given IPv6 Address Ranges to its corresponding CIDR Address format.