buglwIP - A Lightweight TCP/IP stack - Bugs: bug #44023, TCP: ssthresh value is unclear

 
 

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bug #44023: TCP: ssthresh value is unclear

Submitter:  Simon Goldschmidt <goldsimon>
Submitted:  Fri 16 Jan 2015 04:35:58 PM UTC
   
 
Category:  TCP Severity:  3 - Normal
Item Group:  Change Request Status:  Fixed
Privacy:  Public Assigned to:  goldsimon
Open/Closed:  Closed Planned Release:  None
lwIP version:  git head

Sun 30 Aug 2015 06:48:29 PM UTC, comment #1: 

fixed: ssthresh is set to the full send window for active open, too, and is updated once after SYN to ensure the correct send window is used

Simon Goldschmidt <goldsimon>
Group administrator
Fri 16 Jan 2015 04:35:58 PM UTC, original submission:  

There are some things unclear to me in the value of ssthresh:

- it is set to "pcb->mss 10" when connecting (for client connections): why 10 MSS?

- it is set to *the full snd_wnd" in tcp_listen_input() (for server connections)

- thus it is different for server/client

- in addition, for server connections, the value is wrong if the remote host supports window scaling but we don't: ssthresh is just set on the (unscaled) window value passed in the SYN and never changed (unless there are retransmissions, of course)

Simon Goldschmidt <goldsimon>
Group administrator

 

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2015-08-30 goldsimon StatusNone Fixed
        Assigned toNone goldsimon
        Open/ClosedOpen Closed

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