Wireshark-bugs: [Wireshark-bugs] [Bug 11861] DSCP field isn't discovered

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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Tue, 08 Dec 2015 21:01:07 +0000

changed bug 11861


What Removed Added
Status UNCONFIRMED RESOLVED
Resolution --- NOTABUG

Comment # 5 on bug 11861 from 
(In reply to Carsten Grohmann from comment #0)
> the DSCP field isn't discovered successfully:
> Internet Protocol Version 4, Src: XX.XX.XX.XX, Dst: XX.XX.XX.XX
>     0100 .... = Version: 4
>     .... 0101 = Header Length: 20 bytes
>     Differentiated Services Field: 0x08 (DSCP: Unknown, ECN: Not-ECT)
>         0000 10.. = Differentiated Services Codepoint: Unknown (2)
>         .... ..00 = Explicit Congestion Notification: Not ECN-Capable
> Transport (0)
> 
> I expect "CS1" for 0x08 instead of "Unknown".


But as you can see from the dissection, the DSCP field doesn't start at bit 0,
it's shifted 2 bits, so the value is 2, which is not a known DSCP value.

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