15 Monitoring
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VPN 3000 Concentrator Series User Guide
Monitor | Statistics | MIB-II | ICMP
This screen shows statistics in MIB-II objects for ICMP traffic on the VPN Concentrator since it was
last booted or reset. RFC 2011 defines ICMP MIB objects.
Figure 15-45: Monitor | Statistics | MIB-II | ICMP screen
Refresh
To update the screen and its data, click Refresh. The date and time indicate when the screen was last
updated.
Total Received / Transmitted
The total number of ICMP messages that the VPN Concentrator received / sent. This number includes
messages counted as
Errors Received / Transmitted. ICMP messages solicit and provide information about
the network environment.
Errors Received / Transmitted
The number of ICMP messages that the VPN Concentrator received but determined to have
ICMP-specific errors (bad ICMP checksums, bad length, etc.).
The number of ICMP messages that the VPN Concentrator did not send due to problems within ICMP
such as a lack of buffers.
Destination Unreachable Received / Transmitted
The number of ICMP Destination Unreachable messages received / sent. Destination Unreachable
messages apply to many network situations, including inability to determine a route, an unusable source
route specified, and the
Don’t Fragment flag set for a packet that must be fragmented.
