User's Manual

SPEEDLAN TM
76
IP Monitor
The brouter keeps the standard SNMP MIB II statistics on IP type protocols as follows:
Datagrams received - The total number of IP datagrams received by the host.
Invalid destinations - The number of input datagrams discarded because the IP address in their IP header’s
destination field was not a valid address for this entity to receive. This count includes invalid addresses (i.e.,
0.0.0.0) and addresses of unsupported classes (i.e., Class E). For entities which are not IP gateways and
therefore do not forward datagrams, this counter includes datagrams discarded because the destination ad-
dress was not a local address.
Unknown protocols - The number of locally-addressed datagrams received successfully but discarded be-
cause of an unknown or unsupported protocol.
Header errors - The number of input datagrams discarded due to errors in their IP headers, including bad
checksum errors, version-number mismatch, other format errors, time-to-live exceeded, errors discovered in
processing their IP options, etc.
Default TTL - The default value inserted into the Time-To-Live field of the IP header of datagrams originated
at this entity, whenever a TTL value is not supplied by the transport-layer protocol.
Forwarding Status - Indicates whether this entity is acting as an IP gateway in respect to the forwarding of
datagrams received by, but not addressed to this enitity. IP gateways forward datagrams, and IP hosts do not
(except those source-routed via the host). Note that for some managed nodes, this object may take on only a
subset of the possible values.