Chapter 9 Troubleshooting
Resolving problems
HST-3000 Ethernet Testing User’s Guide
255
My unit is receiving
layer 4 TCP traffic,
but it is falsely
reporting check-
sum errors.
HSTs running older software
releases interpret a zero (0)
in the checksum of a TCP
header as an error. The lat-
est HST software release
recognizes that a zero value
does not constitute an error.
As a result, if you transmit
TCP traffic from an HST with
a checksum value of zero,
the receiving HST (running
an older version of software)
will falsely interpret the
checksum as errored.
This is more likely to occur
when transmitting a heavy
load or a sudden burst of
traffic.It may also occur
when running an RFC 2544
test with layer 4 TCP traffic.
Verify that both HSTs are
running the most recent soft-
ware release.
HST software
releases are available at
www.jdsu.com.
Table 14 Problems and resolutions (Continued)
Problem Description Resolution
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