With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alIpInterfaceStatsCurrentDuplex
ALTIGA Ip Interface Statistics Current Duplex
1.3.6.1.4.1.3076.2.1.2.8.1.1.1.2
The current LAN duplex mode for this interface.
Back to ALTIGA-IP-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alIpInterfaceStatsCurrentDuplex 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.