With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alTelnetStatsInShDropPackets
ALTIGA Telnet Statistics In Shell Dropped Packets
1.3.6.1.4.1.3076.2.1.2.11.1.15
The total number of Telnet packets from the shell that were dropped during input processing since the system was booted.
Back to ALTIGA-TELNET-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alTelnetStatsInShDropPackets 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.