On Feb 20, 2013, at 9:46 PM, Carlos M. martinez <carlosm3011@xxxxxxxxx> wrote: > Wasn't the 'evil bit' able to hold the value 2 ? > Yes, but we need an RFC for that. From RFC 3514: 6. IANA Considerations This document defines the behavior of security elements for the 0x0 and 0x1 values of this bit. Behavior for other values of the bit may be defined only by IETF consensus [RFC2434]. --Steve Bellovin, https://www.cs.columbia.edu/~smb