Wireshark-bugs: [Wireshark-bugs] [Bug 2854] SCTP checksum and verification error
Date: Sat, 6 Sep 2008 05:57:38 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=2854


Michael Tüxen <[email protected]> changed:

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--- Comment #1 from Michael Tüxen <[email protected]>  2008-09-06 05:57:38 PDT ---
I'm assuming that you are capturing traffic on the loopback device on FreeBSD.
1. The verification tag in the common header of the message containing the INIT
    chunk must be 0. This is required by RFC 4960.
2. When communicating over the loopback interface the checksum is not
    computed by the SCTP implementation for most of the packets to save
    CPU. This is FreeBSD specific and not covered by an RFC. However, Wireshark
    detects that this is not the correct checksum. Wireshark could be improved
to
    to not report the checksum as wrong if it is 0.
In summary: The SCTP implementation and Wireshark behave as intended.

Do you want 0 checksums not being reported as wrong (even if they are
intentionally)?


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