Every DNS change you will ever make becomes live in exactly one way: the old answer dies of old age, and the next request that arrives after its death gets the new one. Nothing propagates. There is no push mechanism,

Every DNS change you will ever make becomes live in exactly one way: the old answer dies of old age, and the next request that arrives after its death gets the new one. Nothing propagates. There is no push mechanism,
A full conntrack table stops a server with bandwidth to spare. Why state exhaustion hides from every dashboard, the one counter that proves it, four lookalike failures, and a sizing worksheet.