The IPv4 base header has a minimum size of <b data-path-to-node=”0″ data-index-in-node=”43″>20 bytes and a maximum size of <b data-path-to-node=”0″ data-index-in-node=”74″>60 bytes. The reason it varies is due to the <b data-path-to-node=”0″ data-index-in-node=”119″>Options field, which is rarely used but can add up to 40 additional bytes to… Read more

Global Unicast Addresses are used for anycast because they are the only address type with a global scope and full routability via the Border Gateway Protocol (BGP). Link-Local addresses are unsuitable because they are restricted to a single local network and cannot be routed across the internet, preventing the “nearest server” selection…

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