maybe what folk here are missing is that many of the largest providers use the "v4 anycast" hack (what the original question described) today, and very successfully. and, for the pedants and seemingly illiterate, what the questioner was suggesting was an rfc1930 violation, the same prefix from more than one origin as, not a partitioned as. 1930 was a good year, but not a great year, i.e. compliance is not enforced as far as i am aware. i believe that his hack will work, and work well. and moving this kind of thing to the client, when the alternative is making the distributed internet work for you, is product marketing promoted by folk with something to sell. and moving it to dns servers is a disfunctional disease of the bad idea fairy. randy