With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
serialConnectDestIpAddress
serial Connect Destination Ip Address
1.3.6.1.2.1.16.19.14.1.2
The IP Address that can be reached at the other end of this serial connection. This object may not be modified if the associated serialConnectStatus object is equal to active(1).
Back to RMON2-MIB MIB page.
IPHost Network monitor allows you to monitor serialConnectDestIpAddress on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.