With IPHost Network Monitor you can run simple snmp requests against a Netscreen device in your network.
nsNatVipCfgTable
NETSCREEN Nat Vip Configure Table
1.3.6.1.4.1.3224.11.3.1
VIP(Virtual IP) allows you to map routable IP addresses to internal servers, therby providing transparent connections for a NAT networks to the Internet. This table collects all VIP configurations in NetScreen device.
Back to NETSCREEN-NAT-MIB MIB page.
IPHost Network monitor allows you to monitor nsNatVipCfgTable 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.