With IPHost Network Monitor you can run simple snmp requests against a Netscreen device in your network.
nsNatMipTable
NETSCREEN Nat Mip Table
1.3.6.1.4.1.3224.11.1
Mapped IP(MIP) is a direct one-to-one maping of traffic destined for one IP address ot another IP address. On NetScreen device, MIP addresses for tunnel and untrusted interfaces can be created.
Back to NETSCREEN-NAT-MIB MIB page.
IPHost Network monitor allows you to monitor nsNatMipTable 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.