In Solaris 10 I can configure (and audit) the arp_cleanup_interval variable using the following command:
$ ndd -get /dev/arp arp_cleanup_interval
300000
In Solaris 11 (Express and Release) the same command returns an "Unknown property" error:
$ ndd -get /dev/arp arp_cleanup_interval
operation failed: Unknown property
Does anyone know if this variable has changed, or been removed from Solaris 11?
Yes, they were removed, by the IP Datapath Refactoring project described in this mail thread from the architecture review.
Try using the command:
to get a list of all the parameters that are supported. BTW, this information is contained in the man page for ndd.