This is the bit mask representing the type of this
mapping. Each bit specifies the type as follows:
The mapping could be only ONE of the foolowing three...
0x01000000 - This mapping is origianted on this router,
i.e. this NAT router performed the translation
0x02000000 - This mapping is learned from the peer, i.e.
this translation was learned from the peer using
NAT Synchronization feature.
0x04000000 - This mapping is owned, i.e. it was originally
learned from peer, but this router received traffic
which used this mapping.
...and only ONE of the following three.
0x00000010 - This mapping is the STATIC mapping.
0x00000020 - This mapping is Dynamic(1 to 1) mapping.
0x00000040 - This mapping is N to 1 mapping.