With IPHost Network Monitor you can run simple snmp requests against a Netscreen device in your network.
nsVpnGwEntry
NETSCREEN Vpn Gw Entry
1.3.6.1.4.1.3224.4.4.1.1
Each enry in the nsVpnGwTable holds a set of configuration parameters associated with an instance of tunnel gateway.
Back to NETSCREEN-VPN-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor nsVpnGwEntry on Netscreen device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Netscreen VPN routers right now.