On Sat, 2 Jun 2012, Masataka Ohta wrote:
Existing routers, which was relying on ID uniqueness of atomic
packets, are now broken when they fragment the atomic packets.
Such routers were always broken. An atomic packet has DF=0 and any
router fragmenting such a packet was and is non-compliant with
the relevant specifications (RFCs 791, 1122, 1812).
//cmh