buglwIP - A Lightweight TCP/IP stack - Bugs: bug #36210, lwIP does not elicit an empty ACK...

 
 

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bug #36210: lwIP does not elicit an empty ACK when received unacceptable ACK

Submitted by:  Woody Wu <narke>
Submitted on:  Mon 16 Apr 2012 03:45:07 PM UTC  
 
Category: TCPSeverity: 3 - Normal
Item Group: Faulty BehaviourStatus: Fixed
Privacy: PublicAssigned to: Simon Goldschmidt <goldsimon>
Open/Closed: ClosedPlanned Release: None
lwIP version: 1.4.0

Sun 06 Apr 2014 08:41:20 PM UTC, comment #1:

Fixed, thanks for reporting.

Simon Goldschmidt <goldsimon>
Project AdministratorIn charge of this item.
Mon 16 Apr 2012 03:45:07 PM UTC, original submission:

When I was testing the code (1.4.0), I found when lwIP received an
unacceptable acknowledge (ackno == snd_nxt + 1), it output nothing.
But, according to RFC 793, page 36:

3. If the connection is in a synchronized state (ESTABLISHED,
FIN-WAIT-1, FIN-WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT),
any unacceptable segment (out of window sequence number or
unacceptible acknowledgment number) must elicit only an empty
acknowledgment segment containing the current send-sequence number
and an acknowledgment indicating the next sequence number expected
to be received, and the connection remains in the same state.

an empty acknowledgment segment should be sent.

I did not test out-of-window segment, but I guess the result should be the same.

Woody Wu <narke>

 

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Depends on the following items: None found

Items that depend on this one: None found

 

Carbon-Copy List
  • -unavailable- added by goldsimon (Posted a comment)
  • -unavailable- added by narke (Submitted the item)
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    Follow 3 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Sun 06 Apr 2014 08:41:20 PM UTCgoldsimonStatusNone=>Fixed
      Assigned toNone=>goldsimon
      Open/ClosedOpen=>Closed

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