On Cisco routers, and most of the others I know about,
you can add a secondary ip address to an interface with
a command like "ip address xx.xx.xx.xx mm.mm.mm.mm
secondary"
but in NMIS this is only the last address seen in the
table that is kept, due to the use of a hash table
(line 6388 of nmis.pl in version 4.2.4).
It would be useful if you can fix it.
thanks for this software
cybrlrdmt at -nospam-yahoo.fr