With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rttMonEchoAdminSourcePort
Round Trip Time Monitor Echo Admin Source Port
1.3.6.1.4.1.9.9.42.1.2.2.1.7
This object represents the source's port number. If this object is not specified, the application will get a port allocated by the system. This object is applicable to all probes except dns, dlsw and sna.
Back to CISCO-RTTMON-MIB MIB page.
IPHost Network monitor allows you to monitor rttMonEchoAdminSourcePort 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.