15 Monitoring
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VPN 3000 Concentrator Series User Guide
Address Mask Requests Received / Transmitted
The number of ICMP Address Mask Request messages received / sent. Address Mask Request messages
ask for the address (subnet) mask for the LAN to which a router connects.
Address Mask Replies Received / Transmitted
The number of ICMP Address Mask Reply messages received / sent. Address Mask Reply messages
respond to Address Mask Request messages by supplying the address (subnet) mask for the LAN to
which a router connects.
Monitor | Statistics | MIB-II | ARP Table
This screen shows entries in the Address Resolution Protocol mapping table since the VPN Concentrator
was last booted or reset. ARP matches IP addresses with physical MAC addresses, so the system can
forward traffic to computers on its network. RFC 2011 defines MIB entries in the ARP table.
The entries are sorted first by
Interface, then by IP Address. To speed display, the Manager may construct
multiple 64-row tables. Use the scroll controls (if present) to view the entire series of tables.
You can also delete dynamic, or learned, entries in the mapping table.
Figure 15-46: Monitor | Statistics | MIB-II | ARP Table screen
Refresh
To update the screen and its data, click Refresh. The date and time indicate when the screen was last
updated.
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