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[lwip-devel] [bug #26251] RST process in TIME_WAIT TCP state

From: Oleg Tyshev
Subject: [lwip-devel] [bug #26251] RST process in TIME_WAIT TCP state
Date: Mon, 20 Apr 2009 11:16:06 +0000
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/2009032609 Firefox/3.0.8 GTB5


                 Summary: RST process in TIME_WAIT TCP state
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: olegreen
            Submitted on: Mon 20 Apr 2009 11:16:04 AM 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: CVS Head



Last week I saw RFC 1337 "TIME-WAIT Assassination Hazards in TCP".
As a simplest fix for TWA hazard in capital 4 was suggested following:

(F1) Ignore RST segments in TIME-WAIT state.

If the 2 minute MSL is enforced, this fix avoids all three hazards.

This is the simplest fix.  One could also argue that it is formally the
correct thing to do; since allowing time for old duplicate segments to die is
one of TIME-WAIT state's functions, the state should not be truncated by a RST

May be we can filter RST segments in TIME-WAIT state (function


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