[lwip-devel] [bug #20779] Keep-Alive and SYNs

[Oleg Tyshev]

Follow-up Comment #2, bug #20779 (project lwip):

This case is described in RFC 793:

      TCP A                                           TCP B

  1.  (CRASH)                               (send 300,receive 100)

  2.  CLOSED                                           ESTABLISHED

  3.  SYN-SENT --> <SEQ=400><CTL=SYN>              --> (??)

  4.  (!!)     <-- <SEQ=300><ACK=100><CTL=ACK>     <-- ESTABLISHED

  5.  SYN-SENT --> <SEQ=100><CTL=RST>              --> (Abort!!)

  6.  SYN-SENT                                         CLOSED

  7.  SYN-SENT --> <SEQ=400><CTL=SYN>              -->

Half-Open Connection Discovery
Figure 10.

Lwip replies correct, but without analyse SYN flag.
The question about activity timer remains open.

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