With IPHost Network Monitor you can run simple snmp requests against a Netscreen device in your network.
nsPlyFixPort
NETSCREEN Ply Fix Port
1.3.6.1.4.1.3224.10.1.1.10
When in policy-based NAT, the new secure address can come from either a Dynamic IP or from a Mapped IP. This object indicates if poliy-based NAT uses fix port when working on NAT mode.
Back to NETSCREEN-POLICY-MIB MIB page.
IPHost Network monitor allows you to monitor nsPlyFixPort on Netscreen device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Netscreen firewalls right now.