[lwip-devel] [bug #44023] TCP: ssthresh value is unclear

[Simon Goldschmidt]

URL:
  <http://savannah.nongnu.org/bugs/?44023>

                 Summary: TCP: ssthresh value is unclear
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: goldsimon
            Submitted on: Fr 16 Jan 2015 16:35:58 GMT
                Category: TCP
                Severity: 3 - Normal
              Item Group: Change Request
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: git head

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Details:

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)




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