a3ipxAttachedNetFormat
1.3.6.1.4.1.43.2.7.4.1.3
The format of the header used on packets sent to the
IPX Network Number associated with this table entry.
This object can be set to 1, 2, 3, or 4 when adding
an entry for a LAN interface. For WAN interfaces,
this object must be set to 5, 6, 7, or 8.