Error counters are monitored to make sure they are not increasing rapidly, because a rapid increase indicates a problem. For information about troubleshooting these problems, see Troubleshooting.
You can monitor error counters for TCP/IP interfaces in the following ways:
Use MONITOR to view counters such as Checksum Errors, Send and Receive Packet Errors, and interface-specific errors. To view these counters, load MONITOR and select LAN/WAN information > interface you want to view.
Use TCPCON to view the following TCP/IP counters:
IP Address Errors
Unknown Protocol Errors
Reassembly Failures Detected
Fragmentation Failures Detected
To view these counters, load TCPCON and select Statistics > IP > More IP Statistics.