With IPHost Network Monitor you can run simple snmp requests against a Netscreen device in your network.
nsVpnMonInSpi
NETSCREEN Vpn Mon In Spi
The SPI for incoming packets
Back to NETSCREEN-VPN-MON-MIB MIB page.
IPHost Network monitor allows you to monitor nsVpnMonInSpi 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.