On Sun, Jul 8, 2012 at 2:23 PM, Jimmy Hess <mysi...@gmail.com> wrote:
> I'm not sure which era exactly in which you consider it legal and > kosher to assign to a network, but even if you relax all the rules > that require contiguity, it is still an illegal network mask for end > hosts, just like 255.255.255.254 is; if an applicant doesn't flag it > out as bad/invalid subnet mask in this era, then they might fail the > filter, > Well, the correct answer is that it IS invalid (because the real world routers tell us so) and this should be the only acceptable answer, but, just to be sure, /31s are valid, can be used, and are used. -- William McCall