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this station that a better route exists to its
intended destination.
ICMP Redirect for
Network
A station receives an ICMP redirect
message with the Code value set to 0
(redirect datagrams for the network).
A router may have sent the message to inform
this station that a better route exists to its
intended destination.
ICMP Source Quench A station receives an ICMP source
quench message.
The station that sent the message may be down
or rebooting.
IP Invalid Header
Checksum
The checksum of an IP header is in
error. The checksum value is calculated
by the sender and written to the packet,
and then recalculated from the received
packet by the receiver. It indicates an
error if the two values are different.
There is a faulty device on the network.
IP Duplicate Address There is more than one MAC Address
associated with the same IP address.
∗ The newly assigned network address is not
unique in the network and conflicts with the
existing network addresses.
∗ The dynamically allocated network address is
not proper.
∗ If the MAC addresses are routers, this is not a
problem.
Diagnoses
Network Analyzer
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Diagnosis references - data link layer
Colasoft Capsa offers expert diagnosis for the following data link layer events.
Severity: Warning
Event Description Threshold Possible causes and
solutions
ARP Too Many
Unrequested
Response
The percentage of unrequested
ARP response of a physical node
is equal to or higher than the
Unrequested Responses
threshold.
Unrequested Responses -
50%
Check the source and target
physical node for possible
ARP spoofing.
ARP Request
Storm
The number of ARP request
packets per second exceeds the
ARP requests/sec threshold,
indicating that an ARP request
storm has been detected.
∗ Sample Time - second
∗ ARP requests/sec - 10
Check the source station for
the application that sent the
ARP requests.
ARP Scan A station is scanning the network
address via ARP requests.
Check the source station for
the application that performs
the scanning.
Graphs
Network Analyzer
© 2009 Colasoft. All rights reserved. Colasoft®, the Colasoft logo, Capsa® are among the trademarks or registered trademarks of the company in
the United States and/or other countries. All other trademarks are
Graphs
Unique to Colasoft Capsa enterprise edition. In addition to the standard statistical views, Colasoft Capsa also
offers instant graphs which allow you to view your network situation in graphic way. You can view graphic
statistics not only for a global network, but also for specific network nodes.
There are multiple graph titles and display options available; this chapter explains how to view graphs, how to
select display options and how to save the graphic data.
Graphing statistics
The graphic data in the Graph view and the statistic information in the Summary view are consistent, you can see
that from the following figures.
Both the Summary view and Graph view offer statistical data about your network. However, the Summary view
property of their respective owners. 80 / 80
Graphs
Network Analyzer
© 2009 Colasoft. All rights reserved. Colasoft®, the Colasoft logo, Capsa® are among the trademarks or registered trademarks of the company in
the United States and/or other countries. All other trademarks are
only presents the instant statistical data, whereas in Graph view you can see the historical data in a certain time
span, e.g. last 120 seconds.
Note: By default, Colasoft Capsa only collects the data on intranet nodes continuously, the data collecting on an
Internet node are not initiated until you select it.
Graphs go with the current node, to get global graphs, you must enable no filter and select the project root node in
the Project Explorer dock window.
Graph display options
The Graph view has two sections: graph list and display pane. The graph list shows the graph groups and the title
of available graphs for the current node, different nodes may have different graph groups and titles.
Group Corresponding
Analyzer
Description
Error Packets None Contains the graphs presenting the statistics of error packets.
General All analyzers Contains the commonly used statistic graphs.
　
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