D-Link DFL-210 - NetDefend - Security Appliance, Log Reference Manual, Page: 377 / 476

2.33. REASSEMBLY
These log messages refer to the REASSEMBLY (Events concerning data reassembly) category.
2.33.1. ack_of_not_transmitted_data (ID: 04800002)
Default Severity INFORMATIONAL
Log Message TCP segment acknowledges data not yet transmitted
Explanation A TCP segment that acknowledges data not yet transmitted was
received. The segment will be dropped.
Gateway Action drop
Recommended Action None.
Revision 1
Context Parameters Connection
2.33.2. invalid_tcp_checksum (ID: 04800003)
Default Severity NOTICE
Log Message TCP segment with invalid checksum
Explanation A TCP segment with an invalid checksum was received. The segment
will be dropped.
Gateway Action drop
Recommended Action None.
Revision 1
Context Parameters Connection
2.33.3. mismatching_data_in_overlapping_tcp_segment
(ID: 04800004)
Default Severity ERROR
Log Message Overlapping TCP segment containing different data
Explanation A TCP segment that partly overlaps segments that has been received
earlier was received. The data in the overlapping part is however
different from the data in the segments received earlier. The segment's
data will be replaced so that it is consistent with the earlier received
segments.
Gateway Action correct the data
Recommended Action Research the source of this errornous traffic.
Revision 1
2.33. REASSEMBLY Chapter 2. Log Message Reference
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