With heavy use of RFC 1918 private addressing a number of applications have run into some difficulty. This has been documented by the IAB in numerous RFCs and several drafts. The purpose of this BOF is NOT to revisit those discussions, but to examine the current limits on NATs, and review some of the proposed mechanisms to deal with those limitations. Based on that review we will decide whether a working group is necessary to (a) provide mechanisms and/or (b) review conflicting mechanisms.