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IP Overview window 186
Models 2616RC, 3096RC & 3196RC Admin Reference Guide 12 • IP (IP, TCP, UDP, & ICMP)
Default Time-To-Live
The default value inserted into the time-to-live field of the IP header of datagrams originated at the T-DAC,
whenever a TTL value is not supplied by the transport layer protocol.
IP Statistics
The following sections describe the IP statistics displayed on the IP Overview window.
Total Datagrams Received
The total number of input datagrams received from interfaces, including those received in error.
Discarded for Header Errors
The number of input datagrams discarded due to errors in their IP headers, including bad checksums, version
number mismatch, other format errors, time-to-live exceeded, errors discovered in processing their IP options,
and so on.
Discarded for Address Errors
The number of input datagrams discarded because the IP address in their IP header’s destination field was not
a valid address to be received at the T-DAC. This count includes invalid addresses (e.g., 0.0.0.0) and addresses
of unsupported Classes (e.g., Class E). For entities which are not IP Gateways and therefore do not forward
datagrams, this counter includes datagrams discarded because the destination address was not a local address.
Forwarded Datagrams
The number of input datagrams for which the T-DAC was not their final IP destination, as a result of which an
attempt was made to find a route to forward them to that final destination. In entities which do not act as IP
Gateways, this counter will include only those packets which were source-routed via the T-DAC, and the
source-route option processing was successful.
Discarded for Unknown Protos
The number of locally-addressed datagrams received successfully but discarded because of an unknown or
unsupported protocol.
Discarded with No Errors
The number of input IP datagrams for which no problems were encountered to prevent their continued pro-
cessing, but which were discarded (for example, due to lack of buffer space).
Note
The Discarded w/No Errors counter does not include any datagrams
discarded while awaiting re-assembly.
Total Deliveries
The total number of input datagrams successfully delivered to IP user-protocols (including ICMP).
Out Requests
The total number of IP datagrams which local IP user-protocols (including ICMP) supplied to IP in requests
for transmission.