On 2 Apr 2014, at 18:17, Thierry Moreau <thierry.moreau@xxxxxxxxxxxxx> wrote: > It may me the first time that an April fool RFC is actually useful. Not necessarily... Geoff Huston and I wrote a draft a couple of years ago that repurposed the Evil Bit as an indicator that a packet has been through an address translator. The purpose was to act as a tie-breaker for those cases when Happy Eyeball algorithms couldn't otherwise distinguish between paths. Ray