The (conceptual) table containing information on
configured tunnels. This table can be used to map a
set of tunnel endpoints to the associated ifIndex
value. It can also be used for row creation. Note
that every row in the tunnelIfTable with a fixed IPv4
destination address should have a corresponding row in
the tunnelConfigTable, regardless of whether it was
created via SNMP.
Since this table does not support IPv6, it is
deprecated in favor of tunnelInetConfigTable.