Re: [lwip-users] no PCB match found at simultaneously TCP connections

[Simon Goldschmidt]

twagner wrote:
> Hello,
> I have the LWIP stack 2.0.3 in combination with FREERTOS 9.0 running on a
> STM32H743.
> When only one tcp (netconn server) connection is active the data
> transmission perform very well and no errors occur.
> But when a second tcp-connection connects and transmits data simultaneously
> to the first, i get PCB mismatches:
> 
> tcp_input: no PCB match found, resetting.
> tcp_rst: seqno 1316683776 ackno 285205344.
> tcp_input: no PCB match found, resetting.
> tcp_rst: seqno 1820393472 ackno 2550260832.
> tcp_input: no PCB match found, resetting.
> tcp_rst: seqno 2642739200 ackno 1409541216.
> .....
> 
> 
> I run a MBTCP server and a webserver on the device.
> On wireshark i see the resets and retransmits.
> 
> Where can it come from?

This could be just a shortage of pcbs. The stats dump below is missing mem
stats and memp stats.

Simon

> If you need more information i will reply.
> 
> Here are my stats:
> link = {xmit = 0, recv = 0, fw = 0, drop = 0, chkerr = 0, lenerr = 0, memerr
> = 0, rterr = 0, proterr = 0, opterr = 0, err = 0, cachehit = 0},
> etharp = {xmit = 10, recv = 1309, fw = 0, drop = 51, chkerr = 0, lenerr = 0,
> memerr = 0, rterr = 0, proterr = 51, opterr = 0, err = 0, cachehit = 13975},
> ip_frag = {xmit = 0, recv = 0, fw = 0, drop = 0, chkerr = 0, lenerr = 0,
> memerr = 0, rterr = 0, proterr = 0, opterr = 0, err = 0, cachehit = 0},
> ip = {xmit = 13977, recv = 14816, fw = 0, drop = 38, chkerr = 0, lenerr =
> 15, memerr = 0, rterr = 0, proterr = 0, opterr = 0, err = 0, cachehit = 0},
> icmp = {xmit = 0, recv = 0, fw = 0, drop = 0, chkerr = 0, lenerr = 0, memerr
> = 0, rterr = 0, proterr = 0, opterr = 0, err = 0, cachehit = 0},
> udp = {xmit = 0, recv = 38, fw = 0, drop = 0, chkerr = 0, lenerr = 0, memerr
> = 0, rterr = 0, proterr = 0, opterr = 0, err = 0, cachehit = 0},
> tcp = {xmit = 13176, recv = 14740, fw = 0, drop = 60, chkerr = 0, lenerr =
> 0, memerr = 0, rterr = 0, proterr = 60, opterr = 0, err = 0, cachehit =
> 13742},
> sys = {sem = {used = 2, max = 4, err = 0},
> mutex = {used = 2, max = 2, err = 0},
> mbox = {used = 3, max = 5, err = 0} 
> 
> 
> 
> --
> Sent from: http://lwip.100.n7.nabble.com/lwip-users-f3.html
> 
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