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DNP 3 reassemble fragments while sequence number is resetting to 0

asked 2019-08-01 15:51:27 +0000

igal.a
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Hi, I encounter a PCAP with a fragmented DNP message that reach TL sequence number 63 in a fragment and continue with next fragment of the message with sequence number 0 and so forth. After looking at the reassemble code I assume fragment_add_seq_single_aging() is not supporting sequence number reset while fragments are received. Is there a specific reason for that or the traffic I am looking at is not legal. I could not find in any place restrictions regarding DL fragment sequence number behavior. Thanks, Igal

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answered 2019-08-01 15:59:47 +0000

flag of United Kingdom of Great Britain and Northern Ireland

23790 ●4 ●950 ●227 https://www.wireshark.org

This is a known issue with reassembly that I've been working on (intermittently) for some time. See change 32548 and bug 14437.

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Thank you Graham

igal.a ( 2019-08-02 13:35:45 +0000 )edit

Sorry Graham, I have one more question. Can you estimate the release date of this change? Thanks

igal.a ( 2019-08-04 08:20:48 +0000 )edit

It's stalled. I (or someone else) needs to finds the spare time to complete.

grahamb ( 2019-08-04 10:42:14 +0000 )edit

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