With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpTcpPassiveOpens
Virtual Router Ip Tcp Passive Opens
The number of times TCP connections have made a direct transition to the synRcvd state from the listen state.
Back to Nortel-Magellan-Passport-IpMIB MIB page.
IPHost Network monitor allows you to monitor vrIpTcpPassiveOpens on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Nortel multiplexers right now.