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Understanding duplicate packets
Chapter 15: Gen3 Capture Card 351
when packet time
difference is less
than
a time difference less than N-milliseconds. Setting this can
help avoid some false-positive results, but you may need to
experiment with the value.
Data link layer If selected, layer 2 of the OSI Model is ignored when
determining duplicate packets. For example, MAC addresses
would not be examined when determining if a packet is a
duplicate. They are ignored, but the rest of the packet is not.
IP time to live (TTL) If selected, the time to live (TTL) value in packets would not be
examined when determining if a packet is a duplicate. This is
useful to select when the same packets makes multiple hops
through routers.
IPv4 type of service
or IPv6 traffic class
If selected, type of service (ToS) and traffic class (for IPv6) would
not be examined when determining if a packet is a duplicate.
The option is most useful when network hardware or software is
changing these quality of service fields.
TCP sequence and
acknowledgement
numbers, and TCP
options
If selected, TCP sequence and acknowledgement numbers,
and also TCP options, are not would not be examined when
determining if a packet is a duplicate. Overall, this ignores the
ordering of the packets and the values of optional packet fields.
4. Click OK .
The capture file loads into Observer and you arrive at the Decode and
Analysis tool.
5. (Optional) If duplicate packets are still visible, repeat the process and select
different duplicate packet handling criteria.
Duplicate packets should now be skipped/ignored in your capture file. No
permanent changes are made to your loaded capture file.
If you want to make your changes permanent, save your results as a new capture
file.