This table maps ip addresses to indices. The output index
is used as a component in some SNMPv3 tables fields (for example:
snmpTargetAddrName). Ipv4 addresses are not supported by this table.
Note: in getNext operations on this table, only mappings which are in use
in snmpTargetAddrTable (using rlTargetAddrMagicUsedInIndex) will be retreived.
The mapped index does not include delimiters which are forbidden
in SNMPv3 tag values (and thus can be used in tag fields).