How should GIMPS handle a lost GIMPS-confirm? The naive approach of requiring
retransmission of the GIMPS-response that requested it would impose a processing
and state maintenance burden on the responding node at an early stage of the
message exchange, which could lead to denial of service problems and also an
amplification attack where a query is sent from a forged address.  Note that the
problem only arises in the case where no reliable messaging association is being
set up; otherwise, GIMPS-confirm is delivered reliably in C-mode.