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Re: [lwip-users] serious lwIP 1.4.0 error

From: Valery Ushakov
Subject: Re: [lwip-users] serious lwIP 1.4.0 error
Date: Wed, 3 Apr 2013 15:25:51 +0000 (UTC)
User-agent: tin/2.0.1-20111224 ("Achenvoir") (UNIX) (NetBSD/6.1_RC1 (macppc))

Peter Sprenger <address@hidden> wrote:

> The lwIP 1.4.0 problem is (I am using raw API), that lwIP gets a
> [FIN,ACK] from the other side (Firefox), but instead of doing a
> tcp_sent callback, it resubmits 3 times the packet that was already
> acked in the [FIN,ACK]. This leads to a hanging half-closed situation.
> Only after some minutes the Firefox on the PC will close the
> connection. Do you know if this has been fixed?

Stupid question, but are you sure the FIN|ACK datagram actually
reaches lwIP tcpip thread?  You may be out of MEMP_NUM_TCPIP_MSG_INPKT.
I ran into this a few times with similar symptoms - lwIP would
retransmit data that looks ACKed if you only check the tcpdump trace.


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