With IPHost Network Monitor you can run simple snmp requests against a Netscreen device in your network.
nsVpnMonTunnelState
NETSCREEN Vpn Mon Tunnel State
The current tunnel status determined by the icmp ping if The monitoring status is on.
Back to NETSCREEN-VPN-MON-MIB MIB page.
IPHost Network monitor allows you to monitor nsVpnMonTunnelState 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.