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Re: [Question #181392]: Decompression Failing for multiple UDP stream
Question #181392 on rohc changed:
Status: Open => Answered
Didier Barvaux proposed the following answer:
I reformulate your problem to be sure to correctly understand it:
- you send several UDP streams to machine A across a ROHC
- a regular interval of time the decompressor reports a CRC failure
while decompressing a ROHC packet.
Is it correct?
To debug this kind of problem, you may:
- Capture the uncompressed UDP streams before they go across the
compressor/decompressor pair. You may use tcpdump for example
(with tcpdump please use option -s0 to avoid to truncate packets).
- Start the UDP streams that cause the problem.
- Wait for the problem to be reproduced.
- Stop the decompressor and the network capture.
- Look at the decompressor traces. Search for the CRC failure. Collect
information about the paquet in the traces (IP addresses, UDP ports...).
You should also find a dump of the (malformed) decompressed packet.
- Try to identify the corresponding packet in the network capture.
- When found, compare the packet from the capture with the one dumped
in the decompressor traces.
The differences you may find between the 2 packets often give some information
about the problem. Contact me on the mailing list if you need some help for
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