Two rules of ipv6 compression8/23/2023 Multiple all-zero blocks can be compressed down to a single 0.Īny and all of these IPv6 compression techniques can be employed on any legal IPv6 address.Leading zeros in any/all blocks of an address can be dropped to compress further.It would be impossible to reliably decompress the address. There would be absolutely no way of knowing how the 5 compressed blocks are allocated between the two gaps. If there are two gaps to fill, it is anyone’s guess as to how many compressed blocks belong to each gap.Ġ143:0000:0000:FF2A:0000:0000:0000:0231 down to Rebuilding the address relies upon filling in the remaining number of blocks in the :: gap with zeros, with the knowledge that each address contains 8 blocks. It becomes obvious why consecutive all-zero blocks can only be compressed one time in any given address. Any single group of neighboring blocks with all zeros in an address can be compressed using a double colon (::). IPv6 addresses are comprised of 8 “quartets” or “blocks” of 4 hex digits.Topics covered include address format, two ways of compressing all-zero blocks, and compressing leading-zeros. This is fundamental to working with IPv6, so pay attention and make sure you understand it. Here are some quick bullet points about the formatting and compression techniques used in IPv6.
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