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[lwip-devel] [bug #59504] Connection reset

From: Oleg Kobrin
Subject: [lwip-devel] [bug #59504] Connection reset
Date: Mon, 23 Nov 2020 06:14:09 -0500 (EST)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.183 Safari/537.36 
Follow-up Comment #2, bug #59504 (project lwip):

Using Wireshark I see that my side does not ACK any packets after first one:

646     14.463599       172.23.3.32     172.23.3.85     TCP     66      50422 → 
8070 [PSH, ACK] Seq=13
Ack=1461 Win=64240 Len=12
649     14.511317       172.23.3.85     172.23.3.32     TCP     1514    8070 → 
50422 [PSH, ACK]
Seq=1461 Ack=13 Win=4084 Len=1460

After some timeout host retransmits unacked packets:

673     14.764273       172.23.3.32     172.23.3.85     TCP     66      [TCP 
Retransmission] 50422 →
8070 [PSH, ACK] Seq=13 Ack=6781 Win=64240 Len=12
...
706     15.363707       172.23.3.32     172.23.3.85     TCP     66      [TCP 
Retransmission] 50422 →
8070 [PSH, ACK] Seq=13 Ack=14053 Win=63628 Len=12
...
767     16.563900       172.23.3.32     172.23.3.85     TCP     90      [TCP 
Retransmission] 50422 →
8070 [PSH, ACK] Seq=13 Ack=25281 Win=64240 Len=36
...
911     18.963925       172.23.3.32     172.23.3.85     TCP     114     [TCP 
Retransmission] 50422 →
8070 [PSH, ACK] Seq=13 Ack=53329 Win=64240 Len=60
...
1260    23.764679       172.23.3.32     172.23.3.85     TCP     174     [TCP 
Retransmission] 50422 →
8070 [PSH, ACK] Seq=13 Ack=106417 Win=63028 Len=120
...

but my side continues sending ack=13 until connection closed.

1849    33.365213       172.23.3.32     172.23.3.85     TCP     54      50422 → 
8070 [RST, ACK]
Seq=241 Ack=218305 Win=0 Len=0
1850    33.365455       172.23.3.85     172.23.3.32     TCP     1514    8070 → 
50422 [PSH, ACK]
Seq=218305 Ack=13 Win=4084 Len=1460
1851    33.365476       172.23.3.32     172.23.3.85     TCP     54      50422 → 
8070 [RST] Seq=13
Win=0 Len=0
1852    33.365673       172.23.3.85     172.23.3.32     TCP     1514    8070 → 
50422 [PSH, ACK]
Seq=219765 Ack=13 Win=4084 Len=1460
1853    33.365685       172.23.3.32     172.23.3.85     TCP     54      50422 → 
8070 [RST] Seq=13
Win=0 Len=0


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Reply to this item at:

  <https://savannah.nongnu.org/bugs/?59504>

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