With IPHost Network Monitor you can run simple snmp requests against a Netscreen device in your network.
nsPlyLogEnable
NETSCREEN Ply Log Enable
1.3.6.1.4.1.3224.10.1.1.15
When you enable logging in an access policy, the NetScreen device logs all connections to which that paticular access policy applies.
Back to NETSCREEN-POLICY-MIB MIB page.
IPHost Network monitor allows you to monitor nsPlyLogEnable 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.